HPESimpliVity

2.0.28

HPESimpliVity.psm1

###############################################################################################################
# HPESimpliVity.psm1
#
# Description:
# This module provides management cmdlets for HPE SimpliVity via the
# REST API. This module has been tested with both VMware and Hyper-V.
#
# Website:
# https://github.com/atkinsroy/HPESimpliVity
#
# AUTHOR
# Roy Atkins HPE Pointnext Services
#
##############################################################################################################
$HPESimplivityVersion = '2.0.28'

<#
(C) Copyright 2020 Hewlett Packard Enterprise Development LP
 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
#>

#region Utility

# Helper function for most cmdlets that accept a hostname parameter. The user supplied hostname(s)
# is/are compared to an object containing a valid hostname property. (e.g. Get-SVThost and Get-SVThardware
# both have this)
function Resolve-SVTFullHostName {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String[]]$HostName,
        
        [Parameter(Mandatory = $true, Position = 1)]
        [System.String[]]$ReferenceHost
    )

    process {
        foreach ($ThisHost in $HostName) {
            $TestHost = $ReferenceHost | Where-Object { $_ -eq $ThisHost }
            
            if (-not $TestHost) {
                Write-Verbose "Specified host $ThisHost not found, attempting to match host name without domain suffix"
                
                $TestHost = $ReferenceHost | 
                Where-Object { $_.Split(".")[0] -eq $ThisHost }
            }

            if ($TestHost) {
                [string[]]$ReturnHost += $TestHost
            }
            else {
                Write-Warning "Specified host $ThisHost not found"
            }
        }
    }

    end {
        if ($ReturnHost) {
            return ($ReturnHost | Sort-Object | Select-Object -Unique)
        }
        else {
            throw 'Specified host(s) not found'
        }
    }
}

# Helper function to return the embedded error message in the body of the response from the API, rather
# than a generic runtime (404) error.
function Get-SVTerror {
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.Object]$Err
    )

    #$VerbosePreference = 'Continue'
    if ($PSVersionTable.PSVersion.Major -lt 6) {
        if ($Err.Exception.Response) {
            $Result = $Err.Exception.Response.GetResponseStream()
            $Reader = New-Object System.IO.StreamReader($Result)
            $Reader.BaseStream.Position = 0
            $Reader.DiscardBufferedData()
            $ResponseBody = $Reader.ReadToEnd()
            Write-Verbose $ResponseBody
            if ($ResponseBody.StartsWith('{')) {
                $ResponseBody = $ResponseBody | ConvertFrom-Json
            }
            return $ResponseBody.Message
        }
    }
    else {
        # PowerShell V6 doesn't support GetResponseStream(), so return the generic runtime error
        return $Err.Exception.Message
    }
}

# Helper function that returns the local date format. Used by cmdlets that return date properties
function Get-SVTLocalDateFormat {
    $Culture = (Get-Culture).DateTimeFormat
    $LocalDate = "$($Culture.ShortDatePattern)" -creplace '^d/', 'dd/' -creplace '^M/', 'MM/' -creplace '/d/', '/dd/'
    $LocalTime = "$($Culture.LongTimePattern)" -creplace '^h:mm', 'hh:mm' -creplace '^H:mm', 'HH:mm'
    return "$LocalDate $LocalTime"
}

# Helper function used by Get/New/Copy-SVTbackup and New/Update-SVTpolicyRule to return the backup
# destination. This must be a cluster or an external store. Otherwise throw an error.
Function Get-SVTbackupDestination {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String[]]$DestinationName
    )

    [bool]$FoundCluster = $false
    [bool]$FoundExternalStore = $false
    foreach ($Destination in $DestinationName) {
        try {
            $Dest = Get-SVTcluster -Name $Destination -ErrorAction Stop
            if ($FoundExternalStore) {
                throw 'FoundMultipleDestinationTypes'
            }
            else {
                Write-Verbose "$($Dest.ClusterName) is a SimpliVity Cluster"
                $FoundCluster = $true
                $DestObject = @{
                    Type = 'Cluster'
                    Name = $Dest.ClusterName  #correct case
                    Id   = $Dest.ClusterId
                }
                [array]$ReturnObject += $DestObject
                continue
            }
        }
        catch {
            if ($_.Exception.Message -eq 'FoundMultipleDestinationTypes') {
                throw 'Destinations must be of type cluster or external store, not both'
            }
            else {
                # Get-SVTcluster must have failed. Try External Store
            }
        }

        try {
            $Dest = Get-SVTexternalStore -Name $Destination -ErrorAction Stop
            if ($FoundCluster) {
                throw 'FoundMultipleDestinationTypes'
            }
            else {
                Write-Verbose "$($Dest.ExternalStoreName) is an external store"
                $FoundExternalStore = $true
                $DestObject = @{
                    Type = 'ExternalStore'
                    Name = $Dest.ExternalStoreName
                    Id   = $Dest.ExternalStoreName
                }
                [array]$ReturnObject += $DestObject
            }
        }
        catch {
            if ($_.Exception.Message -eq 'FoundMultipleDestinationTypes') {
                throw 'Destinations must be of type cluster or external store, not both'
            }
            else {
                Write-Warning "Specified destination name $Destination is not a valid cluster name or external store name"
            }
        }
    } #end foreach
    if ($ReturnObject) {
        Return $ReturnObject
    }
    else {
        throw "Invalid cluster name or external store name specified"
    }
}

# Helper function for Invoke-RestMethod to handle REST errors in one place. The calling function
# then re-throws the error, generated here. This cmdlet either outputs a custom task object if the
# REST API response is a task object, or otherwise the raw JSON.
function Invoke-SVTrestMethod {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.Object]$Uri,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.Collections.IDictionary]$Header,

        [Parameter(Mandatory = $true, Position = 2)]
        [ValidateSet('get', 'post', 'delete', 'put')]
        [System.String]$Method,

        [Parameter(Mandatory = $false, Position = 3)]
        [System.Object]$Body
    )
    
    [System.int32]$Retrycount = 0
    [bool]$Stoploop = $false
    do {
        try {
            if ($PSBoundParameters.ContainsKey('Body')) {
                $Response = Invoke-RestMethod -Uri $Uri -Headers $Header -Body $Body -Method $Method -ErrorAction Stop
            }
            else {
                $Response = Invoke-RestMethod -Uri $Uri -Headers $Header -Method $Method -ErrorAction Stop
            }
            $Stoploop = $true
        }
        catch [System.Management.Automation.RuntimeException] {
            if ($_.Exception.Message -match "Unauthorized") {
                if ($Retrycount -ge 3) {
                    # Exit after 3 retries
                    throw "Runtime error: Session expired and could not reconnect"
                }
                else {
                    $Retrycount += 1
                    Write-Verbose "Session expired, reconnecting..."
                    $OVC = $SVTconnection.OVC -replace 'https://', ''
                    $Retry = Connect-SVT -OVC $OVC -Credential $SVTconnection.Credential

                    # Update the json header with the new token for the retry
                    $Header = @{
                        'Authorization' = "Bearer $($Retry.Token)"
                        'Accept'        = 'application/json' 
                    }
                }
            }
            elseif ($_.Exception.Message -match "The host name could not be parsed") {
                throw "Runtime error: You must first log in using Connect-SVT"
            }
            else {
                #throw "Runtime error: $($_.Exception.Message)"
                # Return the embedded error message in the body of the response from the API
                throw "Runtime error: $(Get-SVTerror($_))"
            }
        }
        catch {
            throw "An unexpected error occurred: $($_.Exception.Message)"
        }
    }
    until ($Stoploop -eq $true)

    # If the JSON output is a task, convert it to a custom object of type 'HPE.SimpliVity.Task' and pass this
    # back to the calling cmdlet. A lot of cmdlets produce task object types, so this cuts out repetition
    # in the module.
    # Note: $Response.task is incorrectly true with /api/omnistack_clusters/throughput, so added a check for this.
    if ($Response.task -and $URI -notmatch '/api/omnistack_clusters/throughput') {
        
        $LocalFormat = Get-SVTLocalDateFormat

        $Response.task | ForEach-Object {
            if ($_.start_time -as [datetime]) {
                $StartTime = Get-Date -Date $_.start_time -Format $LocalFormat
            }
            else {
                $StartTime = $null
            }
            if ($_.end_time -as [datetime]) {
                $EndTime = Get-Date -Date $_.end_time -Format $LocalFormat
            }
            else {
                $EndTime = $null
            }
            [PSCustomObject]@{
                PStypeName      = 'HPE.SimpliVity.Task'
                StartTime       = $StartTime
                AffectedObjects = $_.affected_objects
                OwnerId         = $_.owner_id
                DestinationId   = $_.destination_id
                Name            = $_.name
                EndTime         = $EndTime
                ErrorCode       = $_.error_code
                ErrorMessage    = $_.error_message
                State           = $_.state
                TaskId          = $_.id
                Type            = $_.type
                PercentComplete = $_.percent_complete
            }
        }
    }
    else {
        # For all other object types, return the raw JSON output for the calling cmdlet to deal with
        $Response
    }
}

<#
.SYNOPSIS
    Show information about tasks that are currently executing or have finished executing in a
    HPE SimpliVity environment
.DESCRIPTION
    Performing most Post/Delete calls to the SimpliVity REST API will generate task objects as output.
    Whilst these task objects are immediately returned, the task themselves will change state over time.
    For example, when a Clone VM task completes, its state changes from IN_PROGRESS to COMPLETED.
 
    All cmdlets that return a JSON 'task' object, (e.g. New-SVTbackup and New-SVTclone) will output custom task
    objects of type HPE.SimpliVity.Task and can then be used as input here to find out if the task completed
    successfully. You can either specify the Task ID from the cmdlet output or, more usefully, use $SVTtask.
    This is a global variable that all 'task producing' HPE SimpliVity cmdlets create. $SVTtask is
    overwritten each time one of these cmdlets is executed.
.PARAMETER Task
    The task object(s). Use the global variable $SVTtask which is generated from a 'task producing'
    HPE SimpliVity cmdlet, like New-SVTbackup, New-SVTclone and Move-SVTvm.
.PARAMETER Id
    Specify a valid task ID
.INPUTS
    HPE.SimpliVity.Task
.OUTPUTS
    HPE.SimpliVity.Task
.EXAMPLE
    PS C:\> Get-SVTtask
 
    Provides an update of the task(s) from the last HPESimpliVity cmdlet that creates, deletes or updates
    a SimpliVity resource
.EXAMPLE
    PS C:\> New-SVTbackup -VmName MyVm
    PS C:\> Get-SVTtask
 
    Shows the state of the task executed from the New-SVTbackup cmdlet.
.EXAMPLE
    PS C:\> New-SVTclone Server2016-01 NewServer2016-01
    PS C:\> Get-SVTtask | Format-List
 
    The first command clones the specfied VM.
    The second command monitors the progress of the clone task, showing all the task properties.
.EXAMPLE
    PS C:\> Get-SVTtask -ID d7ef1442-2633-f544-eb31-a5e9317beb0b:d7ef1442-2633-f544-eb31-a5e9317beb0b:3a04b0a7-sd19-4d39-ab93-a03e69ae24a6
 
    Displays the progress of the specified task ID. This command is useful when using the Web console to
    test API calls
.NOTES
#>
function Get-SVTtask {
    [CmdletBinding(DefaultParameterSetName = 'ByObject')]
    param(
        # Use the global variable by default. i.e. the output from the last cmdlet
        # that created task(s) in this session
        [Parameter(Mandatory = $false, Position = 0, ValueFromPipeLine = $true, ParameterSetName = 'ByObject')]
        [System.Object]$Task = $SVTtask,
        
        [Parameter(Mandatory = $false, ParameterSetName = 'ById')]
        [String]$Id
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
        }
        if ($PSboundParameters.ContainsKey('Id')) {
            $Task = @{ TaskId = $Id }
        }
    }

    process {
        foreach ($ThisTask in $Task) {
            $Uri = $global:SVTconnection.OVC + '/api/tasks/' + $ThisTask.TaskId

            try {
                Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get
            }
            catch {
                throw $_.Exception.Message
            }
        }
    }
}

<#
.SYNOPSIS
    Obtain an authentication token from a HPE SimpliVity OmniStack Virtual Controller (OVC).
.DESCRIPTION
    To access the SimpliVity REST API, you need to request an authentication token by issuing a request
    using the OAuth authentication method. Once obtained, you can pass the resulting access token via the
    HTTP header using an Authorisation Bearer token.
 
    The access token is stored in a global variable accessible to all HPESimpliVity cmdlets in the PowerShell
    session. Note that the access token times out after 10 minutes of inactivity. However, the HPEsimplivity
    module will automatically recreate a new token using cached credentials.
.PARAMETER OVC
    The Fully Qualified Domain Name (FQDN) or IP address of any OmniStack Virtual Controller.
    This is the management IP address of the OVC.
.PARAMETER Credential
    User generated credential as System.Management.Automation.PSCredential. Use the Get-Credential
    PowerShell cmdlet to create the credential. This can optionally be imported from a file in cases where
    you are invoking non-interactively. E.g. shutting down the OVC's from a script invoked by UPS software.
.PARAMETER SignedCert
    Requires a trusted cert. By default, the cmdlet allows untrusted self-signed SSL certificates with HTTPS
    connections and enables TLS 1.2.
    NOTE: You don't need this with PowerShell 6.0; it supports TLS1.2 natively and allows certificate bypass
    using Invoke-Method -SkipCertificateCheck. This is not implemented here yet.
.INPUTS
    System.String
.OUTPUTS
    System.Management.Automation.PSCustomObject
.EXAMPLE
    PS C:\>Connect-SVT -OVC <FQDN or IP Address of OVC>
 
    This will securely prompt you for credentials
.EXAMPLE
    PS C:\>$Cred = Get-Credential -Message 'Enter Credentials'
    PS C:\>Connect-SVT -OVC <FQDN or IP Address of OVC> -Credential $Cred
 
    Create the credential first, then pass it as a parameter.
.EXAMPLE
    PS C:\>$CredFile = "$((Get-Location).Path)\OVCcred.XML"
    PS C:\>Get-Credential -Credential '<username@domain>'| Export-CLIXML $CredFile
 
    Another way is to store the credential in a file (as above), then connect to the OVC using:
    PS C:\> Connect-SVT -OVC <FQDN or IP Address of OVC> -Credential $(Import-CLIXML $CredFile)
 
    or:
    PS C:\>$Cred = Import-CLIXML $CredFile
    PS C:\>Connect-SVT -OVC <FQDN or IP Address of OVC> -Credential $Cred
 
    This method is useful in non-interactive sessions. Once the file is created, run the Connect-SVT
    command to connect and reconnect to the OVC, as required.
.NOTES
#>
function Connect-SVT {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("VirtualController", "VC", "Name")]
        [System.String]$OVC,

        [Parameter(Mandatory = $false, Position = 1)]
        [System.Management.Automation.PSCredential]$Credential,

        [Switch]$SignedCert
    )

    $Header = @{
        'Authorization' = 'Basic ' + 
        [System.Convert]::ToBase64String([System.Text.UTF8Encoding]::UTF8.GetBytes('simplivity:'))
        
        'Accept'        = 'application/json'
    }
    $Uri = 'https://' + $OVC + '/api/oauth/token'

    if ($SignedCert) {
        $SignedCertificates = $true
    }
    else {
        $SignedCertificates = $false

        if ( -not ("TrustAllCertsPolicy" -as [type])) {
            $Source = @"
                using System.Net;
                using System.Security.Cryptography.X509Certificates;
                public class TrustAllCertsPolicy : ICertificatePolicy
                {
                    public bool CheckValidationResult(
                    ServicePoint srvPoint, X509Certificate certificate,
                    WebRequest request, int certificateProblem)
                    {
                        return true;
                    }
                }
"@
            Add-Type -TypeDefinition $Source
        }
        [System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
        [System.Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
    }

    # 2 ways to securely authenticate - via an existing credential object or prompt for a credential
    if ($Credential) {
        $OVCcred = $Credential
    }
    else {
        $OVCcred = Get-Credential -Message 'Enter credentials with authorisation to login ' +
        'to your OmniStack Virtual Controller (e.g. administrator@vsphere.local)'
    }

    $Body = @{
        'username'   = $OVCcred.Username
        'password'   = $OVCcred.GetNetworkCredential().Password
        'grant_type' = 'password'
    }

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    $global:SVTconnection = [pscustomobject]@{
        OVC                = "https://$OVC"
        Credential         = $OVCcred
        Token              = $Response.access_token
        UpdateTime         = $Response.updated_at
        Expiration         = $Response.expires_in
        SignedCertificates = $SignedCertificates
    }
    # Return connection object to the pipeline. Used by all other HPESimpliVity cmdlets.
    $global:SVTconnection
}

<#
.SYNOPSIS
    Get the REST API version and SVTFS version of the HPE SimpliVity installation
.DESCRIPTION
    Get the REST API version and SVTFS version of the HPE SimpliVity installation
.INPUTS
    None
.OUTPUTS
    System.Management.Automation.PSCustomObject
.EXAMPLE
    PS C:\> Get-SVTversion
 
    Shows version information for the REST API and SVTFS.
.NOTES
#>
function Get-SVTversion {
    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }
    $Uri = $global:SVTconnection.OVC + '/api/version'

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    $Response | ForEach-Object {
        [PSCustomObject]@{
            'RestApiVersion'          = $_.REST_API_Version
            'SvtFsVersion'            = $_.SVTFS_Version
            'PowerShellModuleVersion' = $HPESimplivityVersion
        }
    }
}

<#
.SYNOPSIS
    Display the performance information about the specified HPE SimpliVity resource(s)
.DESCRIPTION
    Displays the performance metrics for one of the following specified HPE SimpliVity resources:
        - Cluster
        - Host
        - VM
 
    In addition, output from the Get-SVTcluster, Get-Host and Get-SVTvm commands is accepted as input.
.PARAMETER SVTobject
    Used to accept input from the pipeline. Accepts HPESimpliVity objects with a specific type
.PARAMETER ClusterName
    Show performance metrics for the specified SimpliVity cluster(s)
.PARAMETER HostName
    Show performance metrics for the specified SimpliVity node(s)
.PARAMETER VmName
    Show performance metrics for the specified virtual machine(s) hosted on SimpliVity storage
.PARAMETER OffsetHour
    Show performance metrics starting from the specified offset (hours from now, default is now)
.PARAMETER Hour
    Show performance metrics for the specified number of hours (starting from OffsetHour)
.PARAMETER Resolution
    The resolution in seconds, minutes, hours or days
.PARAMETER Chart
    Create a chart instead of showing performance metrics. The chart file is saved to the current folder.
    One chart is created for each object (e.g. cluster, host or VM)
.EXAMPLE
    PS C:\>Get-SVTmetric -ClusterName Production
 
    Shows performance metrics about the specified cluster, using the default hour setting (24 hours) and
    resolution (every hour)
.EXAMPLE
    PS C:\>Get-SVThost | Get-SVTmetric -Hour 1 -Resolution SECOND
 
    Shows performance metrics for all hosts in the federation, for every second of the last hour
.EXAMPLE
    PS C:\>Get-SVTvm | Where VmName -match "SQL" | Get-SVTmetric
 
    Show performance metrics for every VM that has "SQL" in its name
.EXAMPLE
    PS C:\>Get-SVTcluster -ClusterName DR | Get-SVTmetric -Hour 1440 -Resolution DAY
 
    Show daily performance metrics for the last two months for the specified cluster
.EXAMPLE
    PS C:\>Get-SVTvm Vm1,Vm2,Vm3 | Get-Metric -Chart -Verbose
 
    Create chart(s) instead of showing the metric data. Chart files are created in the current folder.
    Use filtering when creating charts for virtual machines to avoid creating a lot of charts.
.EXAMPLE
    PS C:\>Get-SVThost -Name MyHost | Get-Metric -Chart | Foreach-Object {Invoke-Item $_}
 
    Create a metrics chart for the specified host and display it. Note that Invoke-Item only works with
    image files when the Desktop Experience Feature is installed (may not be installed on some servers)
.INPUTS
    System.String
    HPE.SimpliVity.Cluster
    HPE.SimpliVity.Host
    HPE.SimpliVity.VirtualMachine
.OUTPUTS
    HPE.SimpliVity.Metric
.NOTES
#>
function Get-SVTmetric {
    [CmdletBinding(DefaultParameterSetName = 'Host')]
    param
    (
        [Parameter(Mandatory = $true, Position = 0, ParameterSetName = 'Host')]
        [System.String[]]$HostName,

        [Parameter(Mandatory = $true, ParameterSetName = 'Cluster')]
        [System.String[]]$ClusterName,

        [Parameter(Mandatory = $true, ParameterSetName = 'VirtualMachine')]
        [System.String[]]$VmName,

        [Parameter(Mandatory = $true, ValueFromPipeline = $true, 
            ParameterSetName = 'SVTobject')]
        [System.Object]$SVTobject,

        [Parameter(Mandatory = $false, Position = 1)]
        [System.Int32]$OffsetHour = 0,

        [Parameter(Mandatory = $false, Position = 2)]
        [System.Int32]$Hour = 24,

        [Parameter(Mandatory = $false, Position = 3)]
        [ValidateSet('SECOND', 'MINUTE', 'HOUR', 'DAY')]
        [System.String]$Resolution = 'HOUR',

        [Parameter(Mandatory = $false)]
        [Switch]$Chart
    )

    begin {
        #$VerbosePreference = 'Continue'

        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
        }

        $Range = $Hour * 3600
        $Offset = $OffsetHour * 3600
        $LocalFormat = Get-SVTLocalDateFormat

        if ($Resolution -eq 'SECOND' -and $Range -gt 43200 ) {
            throw "Maximum range value for resolution $resolution is 12 hours"
        }
        elseif ($Resolution -eq 'MINUTE' -and $Range -gt 604800 ) {
            throw "Maximum range value for resolution $resolution is 168 hours (1 week)"
        }
        elseif ($Resolution -eq 'HOUR' -and $Range -gt 5184000 ) {
            throw "Maximum range value for resolution $resolution is 1,440 hours (2 months)"
        }
        elseif ($Resolution -eq 'DAY' -and $Range -gt 94608000 ) {
            throw "Maximum range value for resolution $resolution is 26,280 hours (3 years)"
        }

        if ($Resolution -eq 'SECOND' -and $Range -gt 3600 ) {
            Write-Warning 'Using the resolution of SECOND beyond a range of 1 hour can take a long time to complete'
        }
        if ($Resolution -eq 'MINUTE' -and $Range -gt 43200 ) {
            Write-Warning 'Using the resolution of MINUTE beyond a range of 12 hours can take a long time to complete'
        }
    }

    process {
        if ($PSBoundParameters.ContainsKey('SVTobject')) {
            $InputObject = $SVTObject
        }
        elseif ($PSBoundParameters.ContainsKey('ClusterName')) {
            $InputObject = $ClusterName
        }
        elseif ($PSBoundParameters.ContainsKey('HostName')) {
            $InputObject = $HostName
        }
        else {
            $InputObject = $VmName
        }

        foreach ($Item in $InputObject) {
            $TypeName = $Item | Get-Member | Select-Object -ExpandProperty TypeName -Unique
            if ($TypeName -eq 'HPE.SimpliVity.Cluster') {
                $Uri = $global:SVTconnection.OVC + '/api/omnistack_clusters/' + $Item.ClusterId + '/metrics'
                $ObjectName = $Item.ClusterName
            }
            elseif ($TypeName -eq 'HPE.SimpliVity.Host') {
                $Uri = $global:SVTconnection.OVC + '/api/hosts/' + $Item.HostId + '/metrics'
                $ObjectName = $Item.HostName
            }
            elseif ($TypeName -eq 'HPE.SimpliVity.VirtualMachine') {
                $Uri = $global:SVTconnection.OVC + '/api/virtual_machines/' + $Item.VmId + '/metrics'
                $ObjectName = $Item.VmName
            }
            elseif ($PSBoundParameters.ContainsKey('ClusterName')) {
                try {
                    $ClusterId = Get-SVTcluster -ClusterName $Item -ErrorAction Stop | 
                    Select-Object -ExpandProperty ClusterId
                    $Uri = $global:SVTconnection.OVC + '/api/omnistack_clusters/' + $ClusterId + '/metrics'
                    $ObjectName = $Item
                    $TypeName = 'HPE.SimpliVity.Cluster'
                }
                catch {
                    throw $_.Exception.Message
                }
            }
            elseif ($PSBoundParameters.ContainsKey('HostName')) {
                try {
                    $HostId = Get-SVThost -HostName $Item -ErrorAction Stop | 
                    Select-Object -ExpandProperty HostId
                    
                    $Uri = $global:SVTconnection.OVC + '/api/hosts/' + $HostId + '/metrics'
                    $ObjectName = $Item
                    $TypeName = 'HPE.SimpliVity.Host'
                }
                catch {
                    throw $_.Exception.Message
                }
            }
            else {
                try {
                    $VmId = Get-SVTvm -VmName $Item -ErrorAction Stop | Select-Object -ExpandProperty VmId
                    $Uri = $global:SVTconnection.OVC + '/api/virtual_machines/' + $VmId + '/metrics'
                    $ObjectName = $Item
                    $TypeName = 'HPE.SimpliVity.VirtualMachine'
                }
                catch {
                    throw $_.Exception.Message
                }
            }
            Write-verbose "Object name is $ObjectName ($TypeName)"

            try {
                $Uri = $Uri + "?time_offset=$Offset&range=$Range&resolution=$Resolution"
                $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }

            # Unpack the Json into a Custom object. This returns each Metric with a date and some values
            $CustomObject = $Response.metrics | foreach-object {
                $MetricName = (Get-Culture).TextInfo.ToTitleCase($_.name)
                $_.data_points | ForEach-Object {
                    if ($_.date -as [DateTime]) {
                        $Date = Get-Date -Date $_.date -Format $LocalFormat
                    }
                    else {
                        $Date = $null
                    }
                    [pscustomobject] @{
                        Name  = $MetricName
                        Date  = $Date
                        Read  = $_.reads
                        Write = $_.writes
                    }
                }
            } 

            #Transpose the custom object to return each date with read and write for each metric
            $MetricObject = $CustomObject | Sort-Object -Property Date, Name | 
            Group-Object -Property Date | ForEach-Object {
                $Property = [ordered]@{
                    PStypeName = 'HPE.SimpliVity.Metric'
                    Date       = $_.Name
                }

                [string]$prevname = ''
                $_.Group | Foreach-object {
                    # We expect one instance each of Iops, Latency and Throughput per date.
                    # But sometimes the API returns more. Attempting to create a key that already
                    # exists generates a non-terminating error so, check for duplicates.
                    if ($_.name -ne $prevname) {
                        $Property += [ordered]@{
                            "$($_.Name)Read"  = $_.Read
                            "$($_.Name)Write" = $_.Write
                        }
                    }
                    $prevname = $_.Name
                }
               
                $Property += [ordered]@{
                    ObjectType = $TypeName
                    ObjectName = $ObjectName
                }
                New-Object -TypeName PSObject -Property $Property
            }

            if ($PSBoundParameters.ContainsKey('Chart')) {
                [array]$ChartObject += $MetricObject
            }
            else {
                $MetricObject
            }
        } #end for
    } #end process

    end {
        if ($PSBoundParameters.ContainsKey('Chart')) {
            Get-SVTmetricChart -Metric $ChartObject -TypeName $TypeName 
        }
    }
}

# Helper function for Get-SVTmetric
function Get-SVTmetricChart {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.Object]$Metric,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$TypeName
    )

    if ($PSVersionTable.PSVersion.Major -gt 5) {
        throw "Microsoft Chart Controls are not currently supported with PowerShell Core, use Windows PowerShell"
    }

    $ObjectList = $Metric.ObjectName | Select-Object -Unique
    #$ObjectTotal = $ObjectList | Measure-Object | Select-Object -ExpandProperty Count
    
    $Path = Get-Location
    $Culture = Get-Culture
    $StartDate = $Metric | Select-Object -First 1 -ExpandProperty Date
    $EndDate = $Metric | Select-Object -Last 1 -ExpandProperty Date
    $ChartLabelFont = 'Arial, 8pt'
    $ChartTitleFont = 'Arial, 12pt'
    $DateStamp = Get-Date -Format "yyMMddhhmmss"

    # define an object to determine the best interval on the Y axis, given a maximum value
    $Ylimit = (0, 10000, 20000, 40000, 80000, 160000, 320000, 640000, 1280000, 2560000, 5120000, 10240000, 20480000)
    $Yinterval = (200, 500, 1000, 5000, 10000, 15000, 20000, 50000, 75000, 100000, 250000, 400000, 1000000)
    $Yaxis = 0..11 | foreach-object {
        [PSCustomObject]@{
            Limit    = $Ylimit[$_]
            Interval = $YInterval[$_]
        }
    }

    Add-Type -AssemblyName System.Windows.Forms.DataVisualization

    foreach ($Instance in $ObjectList) {
        $DataSource = $Metric | Where-Object ObjectName -eq $Instance
        $DataPoint = $DataSource | Measure-Object | Select-Object -ExpandProperty Count

        # chart object
        $Chart1 = New-object System.Windows.Forms.DataVisualization.Charting.Chart
        $Chart1.Width = 1200
        $Chart1.Height = 600
        $Chart1.BackColor = [System.Drawing.Color]::LightGray

        # title
        try {
            $ShortName = ([ipaddress]$Instance).IPAddressToString
        }
        catch {
            $ShortName = $Instance -split '\.' | Select-Object -First 1
        }
        $null = $Chart1.Titles.Add("$($TypeName): $ShortName - Metrics from $StartDate to $EndDate")
        $Chart1.Titles[0].Font = "Arial,16pt"
        $Chart1.Titles[0].Alignment = "topLeft"

        # chart area
        $AxisEnabled = New-Object System.Windows.Forms.DataVisualization.Charting.AxisEnabled
        $AxisType = New-Object System.Windows.Forms.DataVisualization.Charting.AxisType
        $Area1 = New-Object System.Windows.Forms.DataVisualization.Charting.ChartArea
        $Area1.Name = "ChartArea1"
        $Area1.AxisX.Title = "Date"
        $Area1.AxisX.TitleFont = $ChartTitleFont
        $Area1.AxisX.LabelStyle.Font = $ChartLabelFont

        # to determine an appropriate X axis interval, find the number of data points in the data
        $Interval = [math]::Round($DataPoint / 24) #show 24 dates on X axis only
       
        if ($Interval -lt 1) {
            $Area1.AxisX.Interval = 1
        }
        else {
            $Area1.AxisX.Interval = $Interval
        }

        $Area1.AxisY.Title = "IOPS and Latency (milliseconds)"
        $Area1.AxisY.TitleFont = $ChartTitleFont
        $Area1.AxisY.LabelStyle.Font = $ChartLabelFont

        if ($Interval -gt 12) {
            $BorderWidth = 1  #reduce line weight for charts with long time ranges
        }
        else {
            $BorderWidth = 2
        }

        # To determine an appropriate interval on Y axis, find the maximum value in the data.
        $MaxArray = @(
            $DataSource | Measure-Object -Property LatencyRead -Maximum | Select-Object -ExpandProperty Maximum
            $DataSource | Measure-Object -Property LatencyWrite -Maximum | Select-Object -ExpandProperty Maximum
            $DataSource | Measure-Object -Property IopsRead -Maximum | Select-Object -ExpandProperty Maximum
            $DataSource | Measure-Object -Property IopsWrite -Maximum | Select-Object -ExpandProperty Maximum
        )
        $Max = 0  #ensure Y axis has appropriate interval
        $MaxArray | Foreach-Object {
            if ($_ -gt $Max) {
                $Max = $_
            }
        }

        # determine an appropriate Yaxis interval.
        $Yaxis | ForEach-Object {
            if ($Max -gt $_.Limit) {
                $Yint = $_.Interval
                $Area1.AxisY.Interval = $Yint
            }
        }

        # title for second Y axis
        $Area1.AxisY2.Title = "Throughput (Mbps)"
        $Area1.AxisY2.TitleFont = $ChartTitleFont
        $Area1.AxisY2.LabelStyle.Font = $ChartLabelFont
        $Area1.AxisY2.LineColor = [System.Drawing.Color]::Transparent
        $Area1.AxisY2.MajorGrid.Enabled = $false
        $Area1.AxisY2.Enabled = $AxisEnabled::true

        # Add Area to chart
        $Chart1.ChartAreas.Add($Area1)
        $Chart1.ChartAreas["ChartArea1"].AxisY.LabelStyle.Angle = 0
        $Chart1.ChartAreas["ChartArea1"].AxisX.LabelStyle.Angle = -45

        # legend to chart
        $Legend = New-Object system.Windows.Forms.DataVisualization.Charting.Legend
        $Legend.name = "Legend1"
        $Chart1.Legends.Add($Legend)

        # data series
        $null = $Chart1.Series.Add("IopsRead")
        $Chart1.Series["IopsRead"].YAxisType = $AxisType::Primary
        $Chart1.Series["IopsRead"].ChartType = "Line"
        $Chart1.Series["IopsRead"].BorderWidth = $BorderWidth
        $Chart1.Series["IopsRead"].IsVisibleInLegend = $true
        $Chart1.Series["IopsRead"].ChartArea = "ChartArea1"
        $Chart1.Series["IopsRead"].Legend = "Legend1"
        $Chart1.Series["IopsRead"].Color = [System.Drawing.Color]::RoyalBlue
        $DataSource | ForEach-Object {
            $Date = ([datetime]::parse($_.Date, $Culture)).ToString('hh:mm:ss tt')
            $null = $Chart1.Series["IopsRead"].Points.addxy($Date, $_.IopsRead)
        }

        # data series
        $null = $Chart1.Series.Add("IopsWrite")
        $Chart1.Series["IopsWrite"].YAxisType = $AxisType::Primary
        $Chart1.Series["IopsWrite"].ChartType = "Line"
        $Chart1.Series["IopsWrite"].BorderWidth = $BorderWidth
        $Chart1.Series["IopsWrite"].IsVisibleInLegend = $true
        $Chart1.Series["IopsWrite"].ChartArea = "ChartArea1"
        $Chart1.Series["IopsWrite"].Legend = "Legend1"
        $Chart1.Series["IopsWrite"].Color = [System.Drawing.Color]::DarkTurquoise
        $DataSource | ForEach-Object {
            $Date = ([datetime]::parse($_.Date, $Culture)).ToString('hh:mm:ss tt')
            $null = $Chart1.Series["IopsWrite"].Points.addxy($Date, $_.IopsWrite)
        }

        # data series
        $null = $Chart1.Series.Add("LatencyRead")
        $Chart1.Series["LatencyRead"].YAxisType = $AxisType::Primary
        $Chart1.Series["LatencyRead"].ChartType = "Line"
        $Chart1.Series["LatencyRead"].BorderWidth = $BorderWidth
        $Chart1.Series["LatencyRead"].IsVisibleInLegend = $true
        $Chart1.Series["LatencyRead"].ChartArea = "ChartArea1"
        $Chart1.Series["LatencyRead"].Legend = "Legend1"
        $Chart1.Series["LatencyRead"].Color = [System.Drawing.Color]::Green
        $DataSource | ForEach-Object {
            $Date = ([datetime]::parse($_.Date, $Culture)).ToString('hh:mm:ss tt')
            $null = $Chart1.Series["LatencyRead"].Points.addxy($Date, $_.LatencyRead)
        }

        # data series
        $null = $Chart1.Series.Add("LatencyWrite")
        $Chart1.Series["LatencyWrite"].YAxisType = $AxisType::Primary
        $Chart1.Series["LatencyWrite"].ChartType = "Line"
        $Chart1.Series["LatencyWrite"].BorderWidth = $BorderWidth
        $Chart1.Series["LatencyWrite"].IsVisibleInLegend = $true
        $Chart1.Series["LatencyWrite"].ChartArea = "ChartArea1"
        $Chart1.Series["LatencyWrite"].Legend = "Legend1"
        $Chart1.Series["LatencyWrite"].Color = [System.Drawing.Color]::SpringGreen
        $DataSource | ForEach-Object {
            $Date = ([datetime]::parse($_.Date, $Culture)).ToString('hh:mm:ss tt')
            $null = $Chart1.Series["LatencyWrite"].Points.addxy($Date, $_.LatencyWrite)
        }

        # data series
        $null = $Chart1.Series.Add("ThroughputRead")
        $Chart1.Series["ThroughputRead"].YAxisType = $AxisType::Secondary
        $Chart1.Series["ThroughputRead"].ChartType = "Line"
        $Chart1.Series["ThroughputRead"].BorderWidth = $BorderWidth
        $Chart1.Series["ThroughputRead"].IsVisibleInLegend = $true
        $Chart1.Series["ThroughputRead"].ChartArea = "ChartArea1"
        $Chart1.Series["ThroughputRead"].Legend = "Legend1"
        $Chart1.Series["ThroughputRead"].Color = [System.Drawing.Color]::Firebrick
        $DataSource | ForEach-Object {
            $Date = ([datetime]::parse($_.Date, $Culture)).ToString('hh:mm:ss tt')
            $null = $Chart1.Series["ThroughputRead"].Points.addxy($Date, ($_.ThroughputRead / 1024 / 1024))
        }

        # data series
        $null = $Chart1.Series.Add("ThroughputWrite")
        $Chart1.Series["ThroughputWrite"].YAxisType = $AxisType::Secondary
        $Chart1.Series["ThroughputWrite"].ChartType = "Line"
        $Chart1.Series["ThroughputWrite"].BorderWidth = $BorderWidth
        $Chart1.Series["ThroughputWrite"].IsVisibleInLegend = $true
        $Chart1.Series["ThroughputWrite"].ChartArea = "ChartArea1"
        $Chart1.Series["ThroughputWrite"].Legend = "Legend1"
        $Chart1.Series["ThroughputWrite"].Color = [System.Drawing.Color]::OrangeRed
        $DataSource | ForEach-Object {
            $Date = ([datetime]::parse($_.Date, $Culture)).ToString('hh:mm:ss tt')
            $null = $Chart1.Series["ThroughputWrite"].Points.addxy($Date, ($_.ThroughputWrite / 1024 / 1024))
        }

        # save chart and send filename to the pipeline
        try {
            $Chart1.SaveImage("$Path\SVTmetric-$ShortName-$DateStamp.png", "png")
            Get-ChildItem "$Path\SVTmetric-$ShortName-$DateStamp.png"
        }
        catch {
            throw "Could not create $Path\SVTmetric-$ShortName-$DateStamp.png"
        }
    }
}

# Helper function for Get-SVTcapacity
function Get-SVTcapacityChart {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.Object]$Capacity
    )

    if ($PSVersionTable.PSVersion.Major -gt 5) {
        throw "Microsoft Chart Controls are not currently supported with PowerShell Core, use Windows PowerShell"
    }
    Add-Type -AssemblyName System.Windows.Forms.DataVisualization

    $Path = Get-Location
    $ChartLabelFont = 'Arial, 10pt'
    $ChartTitleFont = 'Arial, 13pt'
    $DateStamp = Get-Date -Format "yyMMddhhmmss"

    $objectlist = $Capacity.HostName | Select-Object -Unique
    foreach ($Instance in $ObjectList) {
        $Cap = $Capacity | Where-Object HostName -eq $Instance | Select-Object -Last 1

        $DataSource = [ordered]@{
            'Allocated Capacity'          = $Cap.AllocatedCapacity / 1GB
            'Used Capacity'               = $Cap.UsedCapacity / 1GB
            'Used Logical Capacity'       = $Cap.UsedLogicalCapacity / 1GB
            'Free Space'                  = $Cap.FreeSpace / 1GB
            'Capacity Savings'            = $Cap.CapacitySavings / 1GB
            'Local Backup Capacity'       = $Cap.LocalBackupCapacity / 1GB
            'Remote Backup Capacity'      = $Cap.RemoteBackupCapacity / 1GB
            'Stored Compressed Data'      = $Cap.StoredCompressedData / 1GB
            'Stored Uncompressed Data'    = $Cap.StoredUncompressedData / 1GB
            'Stored Virtual Machine Data' = $Cap.StoredVirtualMachineData / 1GB
        }

        # chart object
        $Chart1 = New-object System.Windows.Forms.DataVisualization.Charting.Chart
        $Chart1.Width = 1200
        $Chart1.Height = 600

        # title
        try {
            $ShortName = ([ipaddress]$Instance).IPAddressToString
        }
        catch {
            $ShortName = $Instance -split '\.' | Select-Object -First 1
        }
        $null = $Chart1.Titles.Add("HPE.SimpliVity.Host: $ShortName - Capacity from $($Cap.Date)")
        $Chart1.Titles[0].Font = "Arial,16pt"
        $Chart1.Titles[0].Alignment = "topLeft"

        # chart area
        $Area1 = New-Object System.Windows.Forms.DataVisualization.Charting.ChartArea
        $Area3Dstyle = New-Object System.Windows.Forms.DataVisualization.Charting.ChartArea3DStyle
        $Area3Dstyle.Enable3D = $true
        $Area3Dstyle.LightStyle = 1
        $Area3Dstyle.Inclination = 20
        $Area3Dstyle.Perspective = 0

        $Area1 = $Chart1.ChartAreas.Add('ChartArea1')
        $Area1.Area3DStyle = $Area3Dstyle

        $Area1.AxisY.Title = "Size (GB)"
        $Area1.AxisY.TitleFont = $ChartTitleFont
        $Area1.AxisY.LabelStyle.Font = $ChartLabelFont
        $Area1.AxisX.MajorGrid.Enabled = $false
        $Area1.AxisX.MajorTickMark.Enabled = $true
        $Area1.AxisX.LabelStyle.Enabled = $true

        $Max = $DataSource.Values | Measure-Object -Maximum | Select-Object -ExpandProperty Maximum
        if ($Max -lt 10000) {
            $Area1.AxisY.Interval = 500
        }
        elseif ($Max -lt 20000) {
            $Area1.AxisY.Interval = 1000
        }
        else {
            $Area1.AxisY.Interval = 5000
        }
        $Area1.AxisX.Interval = 1
        $Chart1.ChartAreas["ChartArea1"].AxisY.LabelStyle.Angle = 0
        $Chart1.ChartAreas["ChartArea1"].AxisX.LabelStyle.Angle = -45

        # add series
        $null = $Chart1.Series.Add("Data")
        $Chart1.Series["Data"].Points.DataBindXY($DataSource.Keys, $DataSource.Values)

        # save chart
        try {
            $Chart1.SaveImage("$Path\SVTcapacity-$ShortName-$DateStamp.png", "png")
            Get-ChildItem "$Path\SVTcapacity-$ShortName-$DateStamp.png"
        }
        catch {
            throw "Could not create $Path\SVTcapacity-$ShortName-$DateStamp.png"
        }
    }
}

# Helper function for Get-SVTdisk
# Notes: This method works quite well when all the disks are the same capacity. The 380 H introduces a bit
# of a problem. As long as the disks are sorted by slot number (i.e. the first disk will always be an SSD),
# then the 380H disk capacity will be 1.92TB - the first disk is used to confirm the server type. This
# method may break if additional models continue to be added.
# G (all flash) and H are both software optimized models.
function Get-SVTmodel { 
    $Model = (
        '325', 
        '325', 
        '2600', 
        '380', 
        '380', 
        '380', 
        '380', 
        '380', 
        '380 Gen10 H',
        '380 Gen10 H', 
        '380 Gen10 G', 
        '380 Gen10 G',
        '380 Gen10 G',
        '380 Gen10 G'
    )
    $DiskCount = (4, 6, 6, 5, 5, 9, 12, 12, 12, 24, 6, 8, 12, 16)
    $DiskCapacity = (2, 2, 2, 1, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2)
    $Kit = (
        ' 4-8TB - SVT325 Extra Small',
        ' 7-15TB - SVT325 Small',
        ' 7-15TB - SVT2600',
        ' 3-6TB - SVT380Gen10 Extra Small', # 960GB disk ~ 1TB
        ' 6-12TB - SVT380Gen10 Small',
        '12-25TB - SVT380Gen10 Medium',
        '20-40TB - SVT380Gen10 Large',
        '40-80TB - SVT380Gen10 Extra Large', # 3.8TB disk ~ 4TB
        '20-40TB - SVT380Gen10H (LFF)', #4X1.92 SSD + 8X4TB HDD = 12 disks (Backup/Archive)
        '25-50TB - SVT380Gen10H (SFF)', #4X1.92 SSD + 20X1.2TB HDD = 24 disks (General Purpose)
        ' 8-16TB - SVT380Gen10G x6',
        ' 7-15TB - SVT380Gen10G x8',
        '15-30TB - SVT380Gen10G x12',
        '20-40TB - SVT380Gen10G x16'
    )
    
    # return a custom object
    0..13 | ForEach-Object {
        [PSCustomObject]@{
            Model        = $Model[$_]
            DiskCount    = $DiskCount[$_]
            DiskCapacity = $DiskCapacity[$_]
            StorageKit   = $Kit[$_]
        }
    }
}

#endregion Utility

#region Backup

<#
.SYNOPSIS
    Display information about HPE SimpliVity backups.
.DESCRIPTION
    Show backup information from the HPE SimpliVity Federation. By default, SimpliVity backups from the
    last 24 hours are shown, but this can be overridden by specifying the -Hour parameter. Alternatively,
    specify VM name, Cluster name, or Datacenter name (with or without -Hour) to filter backups appropriately.
 
    You can use the -Latest parameter to display (one of) the latest backups for each VM. (Be careful, a
    policy may have more than one rule to backup to different destinations - only one of the backups is shown).
 
    Use the -Limit parameter to limit the number of backups shown. There is a known issue where setting the
    limit above 3000 can result in out of memory errors, so the -Limit parameter can currently be set between
    1 and 3000. The recommended default of 500 is used. A warning is displayed if the number of backups in
    the environment exceeds the limit for a specific Get-SVTbackup command.
 
    Verbose is automatically turned on to show more information about what this command is doing.
.PARAMETER VmName
    Show backups for the specified virtual machine only.
.PARAMETER DataStoreName
    Show backups located on the specified Simplivity datastore only.
.PARAMETER DestinationName
    Show backups located on the specified HPE SimpliVity cluster name or external datastore name only.
.PARAMETER BackupName
    Show backups for the specified backup name only.
.PARAMETER BackupId
    Show backups with the specified backup ID only.
.PARAMETER All
    Show all backups. The maximum limit of 3000 is assumed, so this command might take a while depending
    on the number of backups in the environment.
.PARAMETER Latest
    Show (one of) the latest backups for every unique virtual machine. If a policy has two rules, for example,
    one with a local destination and one with remote a cluster destination, only one of these backups are shown.
.PARAMETER Hour
    The number of hours preceding to report on. By default, the last 24 hours of backups are shown.
.EXAMPLE
    PS C:\> Get-SVTbackup
 
    Show the last 24 hours of backups from the SimpliVity Federation
.EXAMPLE
    PS C:\> Get-SVTbackup -Hour 48 |
        Select-Object VmName, DataStoreName, SentMB, UniqueSizeMB | Format-Table -Autosize
 
    Show backups up to 48 hours old and select specific properties to display
.EXAMPLE
    PS C:\> Get-SVTbackup -Name '2019-05-05T00:00:00-04:00'
 
    Shows the backup(s) with the specified backup name
.EXAMPLE
    PS C:\> Get-SVTbackup -All
 
    Shows all backups. This might take a while to complete (limit is set to the maximum 3000, which overrides
    a specified limit)
.EXAMPLE
    PS C:\> Get-SVTbackup -Latest
    PS C:\> Get-SVTbackup -Datastore Datastore1 -Latest
    PS C:\> Get-SVTbackup -DestinationName StoreOnce-Data01 -Latest
 
    The first command shows the latest backup for every VM in the Federation
    The second command shows the latest backup for every VM located on the specified datastore
    The third command shows the latest backup for each VM with a backup on the specified destination (either a
    SimpliVity cluster or an external store)
.EXAMPLE
    PS C:\> Get-SVTbackup -VmName Vm1,Vm2
    PS C:\> Get-SVTbackup -VmName Vm1,Vm2 -Hour 2
 
    The first command shows backups for the specified VMs only, up to the default limit of 500 backups
    The second command shows the latest 2 hours of backups for the specified VMs
.EXAMPLE
    PS C:\> Get-SVTbackup -Datastore DS01,DS02 -Limit 3000
 
    Shows all backups on the specified SimpliVity datastores, up to the specified limit
.EXAMPLE
    PS C:\> Get-SVTbackup -DestinationName cluster1 -Limit 100
 
    Show the latest 100 backups for all VMs located on the specified cluster.
 
    Note: You can specify multiple destinations, but they must all be of the same type. i.e. SimpliVity clusters
    or external stores.
.EXAMPLE
    PS C:\> Get-SVTbackup -DestinationName StoreOnce-Data02,StoreOnce-Data03 -Hour 2
 
    Shows backups that are up to 2 hours old on the specified external datastores.
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Backup
.NOTES
Known issues with the REST API Get operations for Backup objects:
OMNI-53190 REST API Limit recommendation for REST GET backup object calls
OMNI-46361 REST API GET operations for backup objects and sorting and filtering constraints
Filtering on a cluster destination also displays exernal store backups. This issue applies to OVCs only, not MVAs
#>
function Get-SVTbackup {
    [CmdletBinding(DefaultParameterSetName = 'ByHour')]
    param (
        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'ByVmName')]
        [System.String[]]$VmName,

        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'ByDatastoreName')]
        [System.String[]]$DatastoreName,

        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'ByDestinationName')]
        [System.String[]]$DestinationName,

        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'ByBackupName')]
        [Alias("Name")]
        [System.String[]]$BackupName,

        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'ByBackupId')]
        [Alias("Id")]
        [System.String[]]$BackupId,

        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'AllBackup')]
        [switch]$All,

        [Parameter(Mandatory = $false, Position = 1, ParameterSetName = 'ByVmName')]
        [Parameter(Mandatory = $false, Position = 1, ParameterSetName = 'ByDatastoreName')]
        [Parameter(Mandatory = $false, Position = 1, ParameterSetName = 'ByDestinationName')]
        [Parameter(Mandatory = $false, Position = 1, ParameterSetName = 'ByHour')]
        [ValidateRange(1, 175400)]   # up to 20 years
        [System.String]$Hour,

        [Parameter(Mandatory = $false, Position = 2, ParameterSetName = 'ByVmName')]
        [Parameter(Mandatory = $false, Position = 2, ParameterSetName = 'ByDatastoreName')]
        [Parameter(Mandatory = $false, Position = 2, ParameterSetName = 'ByDestinationName')]
        [Parameter(Mandatory = $false, Position = 2, ParameterSetName = 'AllBackup')]
        [Parameter(Mandatory = $false, Position = 2, ParameterSetName = 'ByHour')]
        [switch]$Latest,

        # HPE recommends 500 default, 3000 maximum (OMNI-53190)
        [Parameter(Mandatory = $false)]
        [ValidateRange(1, 3000)]
        [System.Int32]$Limit = 500
    )

    #$VerbosePreference = 'Continue'
    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }
    $BackupObject = @()
    $LocalFormat = Get-SVTLocalDateFormat

    # Offset is problematic with the /backups API. Using 0 to avoid inconsistent results.
    # Case sensitivity is problematic with /backups API. Some properties do not support
    # case insensitive filter, so assuming case sensitive for all
    $Uri = "$($global:SVTconnection.OVC)/api/backups?case=sensitive&offset=0"

    # Filter backup objects. The /backups API has known issue where you can only filter on 1 property
    # for a given filter (OMNI-46361).
    if ($PSBoundParameters.ContainsKey('All')) {
        $Message = "Assuming maximum recommended limit of 3000 with the -All parameter. " +
        "This command may take a long time to complete"
        Write-Verbose $Message
        $Limit = 3000              # used in warning message later
        $Uri += "&limit=$Limit"
    }
    else {
        $Uri += "&limit=$Limit"
    }

    if ($PSBoundParameters.ContainsKey('VmName')) {
        Write-Verbose "VM names are currently case sensitive"
        $VmName = $VmName -join ','
        $Uri += "&virtual_machine_name=$VmName"
    }
    if ($PSBoundParameters.ContainsKey('DatastoreName')) {
        Write-Verbose "Datastore names are currently case sensitive"
        $DatastoreName = $DatastoreName -join ','
        $Uri += "&datastore_name=$DatastoreName"
    }
    if ($PSBoundParameters.ContainsKey('DestinationName')) {
        try {
            $Destination = Get-SVTbackupDestination -Name $DestinationName
            if (($Destination.Type | Select-Object -First 1) -eq 'Cluster') {
                $ClusterId = $Destination.Id -join ','
                $Uri += "&omnistack_cluster_id=$($ClusterId)"
            }
            else {
                $ExternalStoreName = $Destination.Name -join ','
                $Uri += "&external_store_name=$($ExternalStoreName)"
            }
        }
        catch {
            throw $_.Exception.Message
        }
    }
    if ($PSBoundParameters.ContainsKey('BackupName')) {
        Write-Verbose "Backup names are currently case sensitive. Incomplete backup names are matched" 
        $BackupName = ($BackupName -join '*,') + '*'  # Note the Asterix
        $Uri += "&name=$($BackupName -replace '\+', '%2B')"
    }
    if ($PSBoundParameters.ContainsKey('BackupId')) {
        $BackupId = $BackupId -join ','
        $Uri += "&id=$BackupId"
    }

    if ($PSBoundParameters.ContainsKey('Hour')) {
        $StartDate = (Get-Date).AddHours(-$Hour)
        $CreatedAfter = "$(Get-Date $($StartDate.ToUniversalTime()) -format s)Z"
        $Uri += "&created_after=$CreatedAfter"
        
        $Message = "Displaying backups from the last $Hour hours, " +
        "(created after $(Get-date $StartDate -Format $LocalFormat)), limited to $limit backups"
        Write-Verbose $Message
    }
    else {
        # -Hour not specified. We want to show the last 24 hours by default. The user can specify -latest
        # and/or -limit and this still applies. Ignore this 'default' filter if any other parameter is specified.
        $ParamList = 'All', 'VmName', 'DatastoreName', 'DestinationName', 'BackupName', 'BackupId'
        $ParamFound = $false
        foreach ($Param in $ParamList) {
            if ($Param -in $PSBoundParameters.Keys) {
                $ParamFound = $true
            }
        }
        if (-not $ParamFound) {
            $StartDate = (Get-Date).AddHours(-24)
            $CreatedAfter = "$(Get-Date $($StartDate.ToUniversalTime()) -format s)Z"
            $Uri += "&created_after=$CreatedAfter"
        
            $Message = "Displaying backups from the last 24 hours, " +
            "(created after $(Get-date $StartDate -Format $LocalFormat)), limited to $limit backups"
            Write-Verbose $Message
        }
    }

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    $BackupCount = $Response.count
    if ($BackupCount -gt $Limit) {
        $Message = "There are $BackupCount matching backups, but limited to displaying only $Limit. " +
        "Either increase -Limit or use more restrictive parameters"
        Write-Warning $Message 
    }
    else {
        Write-Verbose "There are $BackupCount matching backups"
    }

    if ($PSBoundParameters.ContainsKey('BackupName') -and -not $Response.Backups.Name) {
        throw "Specified backup name(s) $BackupName not found"
    }

    if ($PSBoundParameters.ContainsKey('BackupId') -and -not $Response.Backups.Name) {
        throw "Specified backup ID(s) $BackupId not found"
    }

    if ($PSBoundParameters.ContainsKey('VmName') -and -not $Response.Backups.Name) {
        throw "Backups for specified virtual machine(s) $VmName not found"
    }

    $Response.backups | ForEach-Object {
        if ($_.created_at -as [datetime]) {
            $CreateDate = Get-Date -Date $_.created_at -Format $LocalFormat
        }
        else {
            $CreateDate = $null
        }
        if ($_.unique_size_timestamp -as [DateTime]) {
            $UniqueSizeDate = Get-Date -Date $_.unique_size_timestamp -Format $LocalFormat
        }
        else {
            $UniqueSizeDate = $null
        }

        if ($_.expiration_time -as [Datetime]) {
            $ExpirationDate = Get-Date -Date $_.expiration_time -Format $LocalFormat
        }
        else {
            $ExpirationDate = $null
        }

        if ($_.omnistack_cluster_name) {
            $Destination = $_.omnistack_cluster_name
        }
        else {
            $Destination = $_.external_store_name
        }

        $CustomObject = [PSCustomObject]@{
            PSTypeName        = 'HPE.SimpliVity.Backup'
            VmName            = $_.virtual_machine_name
            CreateDate        = $CreateDate
            ConsistencyType   = $_.consistency_type
            BackupType        = $_.type
            DataStoreName     = $_.datastore_name
            VmId              = $_.virtual_machine_id
            AppConsistent     = $_.application_consistent
            ParentId          = $_.compute_cluster_parent_hypervisor_object_id
            ExternalStoreName = $_.external_store_name
            BackupId          = $_.id
            BackupState       = $_.state
            ClusterId         = $_.omnistack_cluster_id
            VmType            = $_.virtual_machine_type
            SentCompleteDate  = $_.sent_completion_time
            UniqueSizeMB      = [single]('{0:n0}' -f ($_.unique_size_bytes / 1mb))
            ClusterGroupIDs   = $_.cluster_group_ids
            UniqueSizeDate    = $UniqueSizeDate
            ExpiryDate        = $ExpirationDate
            ClusterName       = $_.omnistack_cluster_name
            SentMB            = [single]('{0:n0}' -f ($_.sent / 1mb))
            SizeGB            = [single]('{0:n2}' -f ($_.size / 1gb))
            VmState           = $_.virtual_machine_state
            BackupName        = $_.name
            DatastoreId       = $_.datastore_id
            DataCenterName    = $_.compute_cluster_parent_name
            HypervisorType    = $_.hypervisor_type
            SentDuration      = [System.Int32]$_.sent_duration
            DestinationName   = $Destination
        }
        $BackupObject += $CustomObject
    } #end foreach backup object

    # Finally, if -Latest is specified, just display the latest backup of each VM (or more correctly,
    # ONE of the latest - its possible to have more than 1 rule in a policy to backup a VM to multiple
    # destinations at once).
    if ($PSBoundParameters.ContainsKey('Latest')) {
        Write-Verbose 'The -Latest parameter was specified, show only the latest backup of each VM from the requested backups'
        $BackupObject | 
        ForEach-Object { $_.CreateDate = [datetime]::ParseExact($_.CreateDate, $LocalFormat, $null); $_ } |
        Group-Object VmName |
    
        ForEach-Object { $_.Group | Sort-Object CreateDate | Select-Object -Last 1 }
    }
    else {
        $BackupObject
    }
}

<#
.SYNOPSIS
    Create one or more new HPE SimpliVity backups
.DESCRIPTION
    Creates a backup of one or more virtual machines hosted on HPE SimpliVity. Either specify the VM names
    via the VmName parameter or use Get-SVTvm output to pass in the HPE SimpliVity VM objects to backup.
    Backups are directed to the specified destination cluster or external store, or to the local cluster
    for each VM if no destination name is specified.
.PARAMETER VmName
    The virtual machine(s) to backup. Optionally use the output from Get-SVTvm to provide the required VM names.
.PARAMETER DestinationName
    The destination cluster name or external store name. If nothing is specified, the virtual machine(s)
    is/are backed up locally. If there is a cluster with the same name as an external store, the cluster wins.
.PARAMETER BackupName
    Give the backup(s) a unique name, otherwise a default name with a date stamp is used.
.PARAMETER RetentionDay
    Retention specified in days.
.PARAMETER ConsistencyType
    Available options are:
    1. NONE - This is the default and creates a crash consistent backup
    2. DEFAULT - Create application consistent backups using VMware Snapshot
    3. VSS - Create application consistent backups using Microsoft VSS in the guest operating system. Refer
    to the admin guide for requirements and supported applications
.EXAMPLE
    PS C:\> New-SVTbackup -VmName MyVm -DestinationName ClusterDR
 
    Backup the specified VM to the specified SimpliVity cluster, using the default backup name and retention
.EXAMPLE
    PS C:\> New-SVTbackup MyVm StoreOnce-Data01 -RetentionDay 365 -ConsistencyType DEFAULT
 
    Backup the specified VM to the specified external datastore, using the default backup name and retain the
    backup for 1 year. A consistency type of DEFAULT creates a VMware snapshot to quiesce the disk prior to taking
    the backup
.EXAMPLE
    PS C:\> Get-SVTvm | ? VmName -match '^DB' | New-SVTbackup -BackupName 'Manual backup prior to SQL upgrade'
 
    Locally backup up all VMs with names starting with 'DB' using the specified backup name and with default
    retention of 1 day.
.INPUTS
    System.String
    HPE.SimpliVity.VirtualMachine
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function New-SVTbackup {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String]$VmName,

        [Parameter(Mandatory = $false, Position = 1)]
        [System.String]$DestinationName,

        [Parameter(Mandatory = $false, Position = 2)]
        [System.String]$BackupName = "Created by $(($SVTconnection.Credential.Username -split "@")[0]) at " +
        "$(Get-Date -Format 'yyyy-MM-dd hh:mm:ss')",

        [Parameter(Mandatory = $false, Position = 3)]
        [System.Int32]$RetentionDay = 1,

        [Parameter(Mandatory = $false, Position = 5)]
        [ValidateSet('DEFAULT', 'VSS', 'NONE')]
        [System.String]$ConsistencyType = 'NONE'
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }

        if ($PSBoundParameters.ContainsKey('DestinationName')) {
            try {
                $Destination = Get-SVTbackupDestination -Name $DestinationName -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }
        }

        if ($ConsistencyType -eq 'NONE') {
            $ApplicationConsistent = $false
        }
        else {
            $ApplicationConsistent = $true
        }
    }

    process {
        foreach ($VM in $VmName) {
            try {
                # Getting a specific VM name within the loop here deliberately. Getting all VMs in
                # the begin block might be a problem on systems with a large number of VMs.
                $VmObj = Get-SVTvm -VmName $VM -ErrorAction Stop
                $Uri = $global:SVTconnection.OVC + '/api/virtual_machines/' + $VmObj.VmId + '/backup'
            }
            catch {
                throw $_.Exception.Message
            }

            $Body = @{
                'backup_name'      = $BackupName
                'app_consistent'   = $ApplicationConsistent
                'consistency_type' = $ConsistencyType
                'retention'        = $RetentionDay * 1440  # must be specified in minutes
            }

            if ($Destination.Type -eq 'Cluster') {
                $Body += @{ 'destination_id' = $Destination.Id }
            }
            elseif ($Destination.Type -eq 'ExternalStore') {
                $Body += @{ 'external_store_name' = $Destination.Id }
            }
            else {
                # No destination cluster/external store specified, so use the cluster id local for VM being
                # backed up will be used.
                $Body += @{ 'destination_id' = $VmObj.ClusterId }
            }

            $Body = $Body | ConvertTo-Json
            Write-Verbose $Body

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), backup failed for VM $VM" 
            }
        } #end foreach
    } #end process

    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Restore one or more HPE SimpliVity virtual machines
.DESCRIPTION
    Restore one or more virtual machines hosted on HPE SimpliVity. Use Get-SVTbackup output to pass in the
    backup ID(s) and VmName(s) you'd like to restore. You can either specify a destination datastore or restore
    to the local datastore for each specified backup. By default, the restore will create a new VM with the
    same/specified name, but with a time stamp appended, or you can specify -RestoreToOriginal switch to
    overwrite the existing virtual machine.
 
    BackupId is the only unique identifier for backup objects (e.g. multiple backups can have the same name).
    This makes using this command a little cumbersome by itself. However, you can use Get-SVTBackup to
    identify the backups you want to target and then pass the output to this command.
.PARAMETER RestoreToOriginal
    Specifies that the existing virtual machine is overwritten
.PARAMETER BackupId
    The UID of the backup(s) to restore from
.PARAMETER VmName
    The virtual machine name(s)
.PARAMETER DatastoreName
    The destination datastore name
.EXAMPLE
    PS C:\> Get-SVTbackup -BackupName 2019-05-09T22:00:01-04:00 | Restore-SVTvm -RestoreToOriginal
 
    Restores the virtual machine(s) in the specified backup to the original VM name(s)
.EXAMPLE
    PS C:\> Get-SVTbackup -VmName MyVm | Sort-Object CreateDate | Select-Object -Last 1 | Restore-SVTvm
 
    Restores the latest backup of specified virtual machine, giving it the name of the original VM with a
    data stamp appended
.INPUTS
    System.String
    HPE.SimpliVity.Backup
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Restore-SVTvm {
    # calling this function 'restore VM' rather than 'restore backup' as per the API, because it makes more sense
    [CmdletBinding(DefaultParameterSetName = 'RestoreToOriginal')]
    param (
        [Parameter(Mandatory = $true, Position = 0, ParameterSetName = 'RestoreToOriginal')]
        [switch]$RestoreToOriginal,

        [Parameter(Mandatory = $true, Position = 0, ValueFromPipelinebyPropertyName = $true,
            ParameterSetName = 'NewVm')]
        [Alias("Name")]
        [System.String]$VmName,

        [Parameter(Mandatory = $true, Position = 1, ValueFromPipelinebyPropertyName = $true,
            ParameterSetName = 'NewVm')]
        [System.String]$DataStoreName,

        [Parameter(Mandatory = $true, Position = 2, ValueFromPipelinebyPropertyName = $true)]
        [System.String]$BackupId
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }

        if (-not $PSBoundParameters.ContainsKey('RestoreToOriginal')) {
            try {
                $Alldatastore = Get-SVTdatastore -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }
        }
    }
    process {
        foreach ($BkpId in $BackupId) {
            if ($PSBoundParameters.ContainsKey('RestoreToOriginal')) {

                # Restoring a VM from an external store backup with 'RestoreToOriginal' set is currently
                # not supported. So, check if the backup is located on an external store.
                try {
                    $ThisBackup = Get-SVTbackup -BackupId $BkpId -ErrorAction Stop
                    if ($ThisBackup.ExternalStoreName) {
                        throw "Restoring VM $($ThisBackup.VmName) from a backup located on an external store with 'RestoreToOriginal' set is not supported"    
                    }
                }
                catch {
                    # Don't exit, continue with other restores in the pipeline
                    Write-Error $_.Exception.Message
                    continue
                }

                $Uri = $global:SVTconnection.OVC + '/api/backups/' + $BkpId + '/restore?restore_original=true'
            }
            else {
                $Uri = $global:SVTconnection.OVC + '/api/backups/' + $BkpId + '/restore?restore_original=false'
                
                $DataStoreId = $AllDataStore | Where-Object DataStoreName -eq $DataStoreName | 
                Select-Object -ExpandProperty DataStoreId

                if ($VmName.Length -gt 59) {
                    $RestoreVmName = "$($VmName.Substring(0, 59))-restore-$(Get-Date -Format 'yyMMddhhmmss')"
                }
                else {
                    $RestoreVmName = "$VmName-restore-$(Get-Date -Format 'yyMMddhhmmss')"
                }

                $Body = @{
                    'datastore_id'         = $DataStoreId
                    'virtual_machine_name' = $RestoreVmName
                } | ConvertTo-Json
                Write-Verbose $Body
            }

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), restore failed for VM $RestoreVmName"
            }
        }
    }
    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Delete one or more HPE SimpliVity backups
.DESCRIPTION
    Deletes one or more backups hosted on HPE SimpliVity. Use Get-SVTbackup output to pass in the backup(s)
    to delete or specify the Backup ID, if known.
 
    BackupId is the only unique identifier for backup objects (e.g. multiple backups can have the same name).
    This makes using this command a little cumbersome by itself. However, you can use Get-SVTBackup to
    identify the backups you want to target and then pass the output to this command.
.PARAMETER BackupId
    The UID of the backup(s) to delete
.EXAMPLE
    PS C:\> Get-Backup -BackupName 2019-05-09T22:00:01-04:00 | Remove-SVTbackup
 
    Deletes the backups with the specified backup name
.EXAMPLE
    PS C:\> Get-Backup -VmName MyVm -Hour 3 | Remove-SVTbackup
 
    Delete any backup that is at least 3 hours old for the specified virtual machine
.EXAMPLE
    PS C:\> Get-Backup | ? VmName -match "test" | Remove-SVTbackup
 
    Delete all backups for all virtual machines that have "test" in their name
.INPUTS
    System.String
    HPE.SimpliVity.Backup
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
    This cmdlet uses the /api/backups/delete REST API POST call which creates a task to delete the specified
    backup. This call can accept multiple backup IDs, but its used here to delete one backup Id at a time.
    This also works for backups in remote clusters.
 
    There is another specific DELETE call (/api/backups/<bkpId>) which works locally (i.e. if you're connected
    to an OVC where the backup resides), but this fails when trying to delete remote backups.
#>
function Remove-SVTbackup {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String]$BackupId
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }
    }

    process {
        foreach ($BkpId in $BackupId) {
            $Uri = $global:SVTconnection.OVC + '/api/backups/delete'

            $Body = @{ 'backup_id' = @($BkpId) } | ConvertTo-Json
            Write-Verbose $Body

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), failed to remove backup with id $BkpId"
            }
        }
    }

    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Stops (cancels) a currently executing HPE SimpliVity backup
.DESCRIPTION
    Stops (cancels) a currently executing HPE SimpliVity backup
 
    BackupId is the only unique identifier for backup objects (e.g. multiple backups can have the same name).
    This makes using this command a little cumbersome by itself. However, you can use Get-SVTBackup to identify
    the backups you want to target and then pass the output to this command.
.PARAMETER BackupId
    Specify the Backup ID(s) for the backup(s) to cancel
.EXAMPLE
    PS C:\>Get-SVTbackup -BackupName '2019-05-12T01:00:00-04:00' | Stop-SVTBackup
 
    Cancels the backup or backups with the specified backup name.
.INPUTS
    System.String
    HPE.SimpliVity.Backup
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Stop-SVTbackup {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String]$BackupId
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }
    }

    process {
        foreach ($BkpId in $BackupId) {
            $Uri = $global:SVTconnection.OVC + '/api/backups/' + $BkpId + '/cancel'

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), failed to stop backup with id $BkpId"
            }
        }
    }

    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Copy HPE SimpliVity backups to another cluster or an external store
.DESCRIPTION
    Copy HPE SimpliVity backups between SimpliVity clusters and backups to and from external stores.
     
    Note, backups currently on external stores can only be copied to the cluster they were backed
    up from. A backup on an external store cannot be copied to another external store. If you
 
    If you try to copy a backup to a destination where is already exists, the task will fail with a "Duplicate
    name exists" message.
 
    BackupId is the only unique identifier for backup objects (e.g. multiple backups can have the same name).
    This makes using this command a little cumbersome by itself. However, you can use Get-SVTBackup to
    identify the backups you want to target and then pass the output to this command.
.PARAMETER DestinationName
    Specify the destination SimpliVity Cluster name or external store name. If a cluster exists with the
    same name as an external store, the cluster wins.
.PARAMETER BackupId
    Specify the Backup ID(s) to copy. Use the output from an appropriate Get-SVTbackup command to provide
    one or more Backup ID's to copy.
.EXAMPLE
    PS C:\>Get-SVTbackup -VmName Server2016-01 | Copy-SVTbackup -DestinationName Cluster02
 
    Copy the last 24 hours of backups for the specified VM to the specified SimpliVity cluster
.EXAMPLE
    PS C:\>Get-SVTbackup -Hour 2 | Copy-SVTbackup Cluster02
 
    Copy the last two hours of all backups to the specified cluster
.EXAMPLE
    PS C:\>Get-SVTbackup -Name 'BeforeSQLupgrade' | Copy-SVTbackup -DestinationName StoreOnce-Data02
 
    Copy backups with the specfied name to the specified external store.
.INPUTS
    System.String
    HPE.SimpliVity.Backup
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Copy-SVTbackup {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$DestinationName,

        [Parameter(Mandatory = $true, Position = 1, ValueFromPipelinebyPropertyName = $true)]
        [System.String]$BackupId
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }

        try {
            $Destination = Get-SVTbackupDestination -Name $DestinationName -ErrorAction Stop

            if ($Destination.Type -eq 'Cluster') {
                $Body = @{ 'destination_id' = $Destination.Id } | ConvertTo-Json
                Write-Verbose $Body
            }
            else {
                $Body = @{ 'external_store_name' = $Destination.Id } | ConvertTo-Json
                Write-Verbose $Body
            }
        }
        catch {
            throw $_.Exception.Message
        }
    }

    process {
        foreach ($thisbackup in $BackupId) {
            try {
                $Uri = $global:SVTconnection.OVC + '/api/backups/' + $thisbackup + '/copy'
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), copy failed for backup with id $thisbackup"
            }
        }
    }
    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Locks HPE SimpliVity backups to prevent them from expiring
.DESCRIPTION
    Locks HPE SimpliVity backups to prevent them from expiring
 
    BackupId is the only unique identifier for backup objects (e.g. multiple backups can have the same name).
    This makes using this command a little cumbersome by itself. However, you can use Get-SVTBackup to identify
    the backups you want to target and then pass the output to this command.
.PARAMETER BackupId
    Lock the backup(s) with the specified backup ID(s)
.EXAMPLE
    PS C:\>Get-SVTBackup -BackupName 2019-05-09T22:00:01-04:00 | Lock-SVTbackup
    PS C:\>Get-SVTtask
 
    Locks the backup(s) with the specified name. Use Get-SVTtask to track the progress of the task(s).
.INPUTS
    System.String
    HPE.SimpliVity.Backup
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Lock-SVTbackup {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipelinebyPropertyName = $true)]
        [System.String]$BackupId
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }
    }

    process {
        foreach ($BkpId in $BackupId) {
            $Uri = $global:SVTconnection.OVC + '/api/backups/' + $BkpId + '/lock'

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), failed to lock backup with id $BkpId"
            }
            
        }
    }
    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Rename existing HPE SimpliVity backup(s)
.DESCRIPTION
    Rename existing HPE SimpliVity backup(s).
 
    BackupId is the only unique identifier for backup objects (e.g. multiple backups can have the same name).
    This makes using this command a little cumbersome by itself. However, you can use Get-SVTBackup to identify
    the backups you want to target and then pass the output to this command.
.PARAMETER BackupName
    The new backup name. Must be a new unique name. The command fails if there are existing backups with this name.
.PARAMETER BackupId
    The backup Ids of the backups to be renamed
.EXAMPLE
    PS C:\> Get-SVTbackup -BackupName "Pre-SQL update"
    PS C:\> Get-SVTbackup -BackupName 2019-05-11T09:30:00-04:00 | Rename-SVTBackup "Pre-SQL update"
 
    The first command confirms the backup name is not in use. The second command renames the specified backup(s).
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Rename-SVTbackup {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [Alias("NewName")]
        [System.String]$BackupName,

        [Parameter(Mandatory = $true, Position = 1, ValueFromPipelinebyPropertyName = $true)]
        [System.String]$BackupId
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }
    }

    process {
        foreach ($BkpId in $BackupId) {
            $Uri = $global:SVTconnection.OVC + '/api/backups/' + $BkpId + '/rename'

            $Body = @{ 'backup_name' = $BackupName } | ConvertTo-Json
            Write-Verbose $Body

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), rename failed for backup $BkpId"
            }
        }
    }
    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Set the retention of existing HPE SimpliVity backups
.DESCRIPTION
    Change the retention on existing SimpliVity backup.
 
    BackupId is the only unique identifier for backup objects (e.g. multiple backups can have the same
    name). This makes using this command a little cumbersome by itself. However, you can use Get-SVTBackup
    to identify the backups you want to target and then pass the output to this command.
 
    Note: There is currently a known issue with the REST API that prevents you from setting retention times
    that will cause backups to immediately expire. if you try to decrease the retention for a backup policy
    where backups will be immediately expired, you'll receive an error in the task.
 
    OMNI-53536: Setting the retention time to a time that causes backups to be deleted fails
.PARAMETER BackupId
    The UID of the backup you'd like to set the retention for
.PARAMETER RetentionDay
    The new retention you would like to set, in days.
.EXAMPLE
    PS C:\> Get-Backup -BackupName 2019-05-09T22:00:01-04:00 | Set-SVTbackupRetention -RetentionDay 21
 
    Gets the backups with the specified name and sets the retention to 21 days.
.INPUTS
    System.String
    HPE.SimpliVity.Backup
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Set-SVTbackupRetention {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.Int32]$RetentionDay,

        [Parameter(Mandatory = $true, Position = 1, ValueFromPipelinebyPropertyName = $true)]
        [System.String]$BackupId

        # Force is supported by the API - it tells SimpliVity to set the retention even if backups
        # will be expired. This currently doesn't work, though. For now, this parameter is disabled so
        # if you try to decrease the retention for a backup policy where backups will be immediately
        # expired, you'll receive an error in the task.
        # [Parameter(Mandatory=$true, Position=2)]
        # [Switch]$Force
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }

        $Uri = $global:SVTconnection.OVC + '/api/backups/set_retention'

        $ForceRetention = $false
        if ($PSBoundParameters.ContainsKey('Force')) {
            Write-Warning 'Possible deletion of some backups, depending on age and retention set'
            $ForceRetention = $true
        }
    }

    process {
        # This API call accepts a list of backup Ids. However, we are creating a task per backup ID here.
        # Using a task list with a single task may be more efficient, but its inconsistent with the other cmdlets.
        foreach ($BkpId in $BackupId) {
            $Body = @{
                'backup_id' = @($BkpId)            # Expects an array (square brackets around it in Json)
                'retention' = $RetentionDay * 1440 # Must be specified in minutes
                'force'     = $ForceRetention
            } | ConvertTo-Json
            Write-Verbose $Body

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), failed to set retention for backup with id $BkpId"
            }
        }
    }
    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Calculate the unique size of HPE SimpliVity backups
.DESCRIPTION
    Calculate the unique size of HPE SimpliVity backups
 
    BackupId is the only unique identifier for backup objects (e.g. multiple backups can have the same
    name). This makes using this command a little cumbersome by itself. However, you can use Get-SVTBackup
    to identify the backups you want to target and then pass the output to this command.
.PARAMETER BackupId
    Use Get-SVTbackup to output the required VMs as input for this command
.EXAMPLE
    PS C:\>Get-SVTbackup -VmName VM01 | Update-SVTbackupUniqueSize
 
    Starts a task to calculate the unique size of the specified backup(s)
.EXAMPLE
    PS:\> Get-SVTbackup -Latest | Update-SVTbackupUniqueSize
 
    Starts a task per backup object to calculate the unique size of the latest backup for each local VM.
.INPUTS
    System.String
    HPE.SimpliVity.VirtualMachine
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
    This command only updates the backups in the local cluster. Login to an OVC in a remote cluster to
    update the backups there. The UniqueSizeDate property is updated on the backup object(s) when you run
    this command
#>
function Update-SVTbackupUniqueSize {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String]$BackupId
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.7+json'
        }
    }

    process {
        foreach ($BkpId in $BackupId) {
            $Uri = $global:SVTconnection.OVC + '/api/backups/' + $BkpId + '/calculate_unique_size'

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Post -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }
            [array]$AllTask += $Task
            $Task
        }
    }

    end {
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

#endregion Backup

#region Datastore

<#
.SYNOPSIS
    Display HPE SimpliVity datastore information
.DESCRIPTION
    Shows datastore information from the SimpliVity Federation
.PARAMETER DataStoreName
    Show information for the specified datastore only
.EXAMPLE
    PS C:\> Get-SVTdatastore
 
    Shows all datastores in the Federation
.EXAMPLE
    PS C:\> Get-SVTdatastore -Name DS01 | Export-CSV Datastore.csv
 
    Writes the specified datastore information into a CSV file
.EXAMPLE
    PS C:\> Get-SVTdatastore DS01,DS02,DS03 | Select-Object Name, SizeGB, Policy
 
    Shows the specified properties for the HPE SimpliVity datastores
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.DataStore
.NOTES
#>
function Get-SVTdatastore {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0)]
        [Alias("Name")]
        [System.String[]]$DatastoreName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }
    $Uri = $global:SVTconnection.OVC + '/api/datastores?show_optional_fields=true&case=insensitive'
    $LocalFormat = Get-SVTLocalDateFormat

    if ($PSBoundParameters.ContainsKey('DatastoreName')) {
        $DatastoreName = $DatastoreName -join ','
        $Uri += '&name=' + $DatastoreName
    }

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    if ($PSBoundParameters.ContainsKey('DatastoreName') -and -not $response.datastores.name) {
        throw "Specified datastore(s) $DatastoreName not found"
    }

    $Response.datastores | ForEach-Object {
        if ($_.created_at -as [datetime]) {
            $CreateDate = Get-Date -Date $_.created_at -Format $LocalFormat
        }
        else {
            $CreateDate = $null
        }
        [PSCustomObject]@{
            PSTypeName               = 'HPE.SimpliVity.DataStore'
            ClusterGroupIds          = $_.cluster_group_ids
            PolicyId                 = $_.policy_id
            MountDirectory           = $_.mount_directory
            CreateDate               = $CreateDate
            PolicyName               = $_.policy_name
            ClusterName              = $_.omnistack_cluster_name
            Shares                   = $_.shares
            Deleted                  = $_.deleted
            HyperVisorId             = $_.hypervisor_object_id
            SizeGB                   = '{0:n0}' -f ($_.size / 1gb)
            DataStoreName            = $_.name
            DataCenterId             = $_.compute_cluster_parent_hypervisor_object_id
            DataCenterName           = $_.compute_cluster_parent_name
            HypervisorType           = $_.hypervisor_type
            DataStoreId              = $_.id
            ClusterId                = $_.omnistack_cluster_id
            HypervisorManagementIP   = $_.hypervisor_management_system
            HypervisorManagementName = $_.hypervisor_management_system_name
            HypervisorFreeSpaceGB    = '{0:n0}' -f ($_.hypervisor_free_space / 1gb)
        }
    }
}

<#
.SYNOPSIS
    Create a new HPE SimpliVity datastore
.DESCRIPTION
    Creates a new datastore on the specified SimpliVity cluster. An existing backup
    policy must be assigned when creating a datastore. The datastore size can be between
    1GB and 1,048,576 GB (1,024TB)
.PARAMETER DataStoreName
    Specify the name of the new datastore
.PARAMETER ClusterName
    Specify the cluster of the new datastore
.PARAMETER PolicyName
    Specify the existing backup policy to assign to the new datastore
.PARAMETER SizeGB
    Specify the size of the new datastore in GB
.EXAMPLE
    PS C:\>New-SVTdatastore -DatastoreName ds01 -ClusterName Cluster1 -PolicyName Daily -SizeGB 102400
 
    Creates a new 100TB datastore called ds01 on Cluster1 and assigns the pre-existing Daily backup policy to it
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function New-SVTdatastore {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$DatastoreName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$ClusterName,

        [Parameter(Mandatory = $true, Position = 2)]
        [System.String]$PolicyName,

        [Parameter(Mandatory = $true, Position = 3)]
        [ValidateRange(1, 1048576)]   # Max is 1024TB (matches the SimpliVity plugin limit)
        [System.int32]$SizeGB
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }
    $Uri = $global:SVTconnection.OVC + '/api/datastores/'

    try {
        $ClusterId = Get-SVTcluster -ClusterName $ClusterName -ErrorAction Stop | 
        Select-Object -ExpandProperty ClusterId
        
        $PolicyID = Get-SVTpolicy -PolicyName $PolicyName -ErrorAction Stop | 
        Select-Object -ExpandProperty PolicyId -Unique
    }
    catch {
        throw $_.Exception.Message
    }

    $Body = @{
        'name'                 = $DataStoreName
        'omnistack_cluster_id' = $ClusterId
        'policy_id'            = $PolicyId
        'size'                 = $SizeGB * 1Gb # Size must be in bytes
    } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Remove an HPE SimpliVity datastore
.DESCRIPTION
    Removes the specified SimpliVity datastore. The datastore cannot be in use by any virtual machines.
.PARAMETER DatastoreName
    Specify the datastore to delete
.EXAMPLE
    PS C:\>Remove-SVTdatastore -Datastore DStemp
    PS C:\>Get-SVTtask
 
    Remove the datastore and monitor the task to ensure it completes successfully.
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Remove-SVTdatastore {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$DatastoreName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    try {
        $DatastoreId = Get-SVTdatastore -DatastoreName $DatastoreName -ErrorAction Stop | 
        Select-Object -ExpandProperty DatastoreId
        
        $Uri = $global:SVTconnection.OVC + '/api/datastores/' + $DatastoreId
    }
    catch {
        throw $_.Exception.Message
    }

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Delete -ErrorAction Stop
    }
    catch {
        throw $($_.Exception.Message)
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Resize a HPE SimpliVity Datastore
.DESCRIPTION
    Resizes a specified datastore to the specified size in GB. The datastore size can be
    between 1GB and 1,048,576 GB (1,024TB).
.EXAMPLE
    PS C:\>Resize-SVTdatastore -DatastoreName ds01 -SizeGB 1024
 
    Resizes the specified datastore to 1TB
.PARAMETER DatastoreName
    Apply to specified datastore
.PARAMETER SizeGB
    The new total size of the datastore in GB
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Resize-SVTdatastore {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$DatastoreName,

        [Parameter(Mandatory = $true, Position = 1)]
        [ValidateRange(1, 1048576)] # Max is 1024TB (as per GUI)
        [System.Int32]$SizeGB
    )

    $Header = @{'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'                = 'application/json'
        'Content-Type'          = 'application/vnd.simplivity.v1.5+json'
    }

    try {
        $DatastoreId = Get-SVTdatastore -DatastoreName $DatastoreName -ErrorAction Stop | 
        Select-Object -ExpandProperty DatastoreId

        $Uri = $global:SVTconnection.OVC + '/api/datastores/' + $DatastoreId + '/resize'
        $Body = @{ 'size' = $SizeGB * 1Gb } | ConvertTo-Json # Size must be in bytes
        Write-Verbose $Body
    }
    catch {
        throw $_.Exception.Message
    }

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Sets/changes the backup policy on a HPE SimpliVity Datastore
.DESCRIPTION
    A SimpliVity datastore must have a backup policy assigned to it. A default backup policy
    is assigned when a datastore is created. This command allows you to change the backup
    policy for the specified datastore
.PARAMETER DatastoreName
    Apply to specified datastore
.PARAMETER PolicyName
    The new backup policy for the specified datastore
.EXAMPLE
    PS C:\>Set-SVTdatastorePolicy -DatastoreName ds01 -PolicyName Weekly
 
    Assigns a new backup policy to the specified datastore
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Set-SVTdatastorePolicy {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$DatastoreName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$PolicyName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }
    try {
        $DatastoreId = Get-SVTdatastore -DatastoreName $DatastoreName -ErrorAction Stop | 
        Select-Object -ExpandProperty DatastoreId

        $Uri = $global:SVTconnection.OVC + '/api/datastores/' + $DatastoreId + '/set_policy'

        $PolicyId = Get-SVTpolicy -PolicyName $PolicyName -ErrorAction Stop | 
        Select-Object -ExpandProperty PolicyId -Unique

        $Body = @{ 'policy_id' = $PolicyId } | ConvertTo-Json
        Write-Verbose $Body
    }
    catch {
        throw $_.Exception.Message
    }

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Adds a share to a HPE SimpliVity datastore for a compute node (a standard ESXi host)
.DESCRIPTION
    Adds a share to a HPE SimpliVity datastore for a specified compute node
.PARAMETER DatastoreName
    The datastore to add a new share to
.PARAMETER ComputeNodeName
    The compute node that will have the new share
.EXAMPLE
    PS C:\>Publish-SVTdatastore -DatastoreName DS01 -ComputeNodeName ESXi03
 
    The specified compute node is given access to the datastore
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
    This command currently works in VMware environments only. Compute nodes are not supported with Hyper-V
#>
function Publish-SVTdatastore {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$DatastoreName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$ComputeNodeName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.14+json'
    }

    try {
        $DatastoreId = Get-SVTdatastore -DatastoreName $DatastoreName -ErrorAction Stop | 
        Select-Object -ExpandProperty DatastoreId

        $Uri = $global:SVTconnection.OVC + '/api/datastores/' + $DatastoreId + '/share'
    }
    catch {
        throw $_.Exception.Message
    }

    $Body = @{ 'host_name' = $ComputeNodeName } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Removes a share from a HPE SimpliVity datastore for a compute node (a standard ESXi host)
.DESCRIPTION
    Removes a share from a HPE SimpliVity datastore for a specified compute node
.PARAMETER DatastoreName
    The datastore to remove a share from
.PARAMETER ComputeNodeName
    The compute node that will no longer have access
.EXAMPLE
    PS C:\>Unpublish-SVTdatastore -DatastoreName DS01 -ComputeNodeName ESXi01
 
    The specified compute node will no longer have access to the datastore
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
    This command currently works in VMware environments only. Compute nodes are not supported with Hyper-V
#>
function Unpublish-SVTdatastore {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$DatastoreName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$ComputeNodeName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.14+json'
    }

    $Body = @{ 'host_name' = $ComputeNodeName } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $DatastoreId = Get-SVTdatastore -DatastoreName $DatastoreName -ErrorAction Stop | 
        Select-Object -ExpandProperty DatastoreId
        
        $Uri = $global:SVTconnection.OVC + '/api/datastores/' + $DatastoreId + '/unshare'
    }
    catch {
        throw $_.Exception.Message
    }

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask # Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Displays the ESXi compute nodes (standard ESXi hosts) that have access to the specified datastore(s)
.DESCRIPTION
    Displays the compute nodes that have been configured to connect to the HPE SimpliVity datastore via NFS
.PARAMETER DatastoreName
    Specify the datastore to display information for
.EXAMPLE
    PS C:\>Get-SVTdatastoreComputeNode -DatastoreName DS01
 
    Display the compute nodes that have NFS access to the specified datastore
.EXAMPLE
    PS C:\>Get-SVTdatastoreComputeNode
 
    Displays all datastores in the Federation and the compute nodes that have NFS access to them
.INPUTS
    system.string
    HPE.SimpliVity.Datastore
.OUTPUTS
    HPE.SimpliVity.ComputeNode
.NOTES
    This command currently works in VMware environments only. Compute nodes are not supported with Hyper-V
#>
function Get-SVTdatastoreComputeNode {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0, ValueFromPipelinebyPropertyName = $true)]
        [System.String[]]$DatastoreName = (Get-SVTdatastore | Select-Object -ExpandProperty DatastoreName)
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
        }
    }

    process {
        foreach ($ThisDatastore in $DatastoreName) {
            try {
                $DatastoreId = Get-SVTdatastore -DatastoreName $ThisDatastore -ErrorAction Stop | 
                Select-Object -ExpandProperty DatastoreId

                $Uri = $global:SVTconnection.OVC + '/api/datastores/' + $DatastoreId + '/standard_hosts'
            }
            catch {
                throw $_.Exception.Message
            }

            try {
                $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }

            $Response.standard_hosts | ForEach-Object {
                [PSCustomObject]@{
                    PSTypeName         = 'HPE.SimpliVity.ComputeNode'
                    DataStoreName      = $ThisDatastore
                    HypervisorObjectId = $_.hypervisor_object_id
                    ComputeNodeIp      = $_.ip_address
                    ComputeNodeName    = $_.name
                    Shared             = $_.shared
                    VmCount            = $_.virtual_machine_count
                }
            }
        } #end foreach datastore
    } # end process
}

<#
.SYNOPSIS
    Displays information on the available external datastores configurated in HPE SimpliVity
.DESCRIPTION
    Displays external stores that have been registered. Upon creation, external datastores are associated
    with a specific SimpliVity cluster, but are subsequently available to all clusters in the cluster group
    to which the specified cluster is a member.
 
    External Stores are preconfigured Catalyst stores on HPE StoreOnce appliances that provide air gapped
    backups to HPE SimpliVity.
.PARAMETER ExternalStoreName
    Specify the external datastore to display information
.EXAMPLE
    PS C:\>Get-SVTexternalStore StoreOnce-Data01,StoreOnce-Data02,StoreOnce-Data03
    PS C:\>Get-SVTexternalStore -Name StoreOnce-Data01
 
    Display information about the specified external datastore(s)
.EXAMPLE
    PS C:\>Get-SVTexternalStore
 
    Displays all external datastores in the Federation
.INPUTS
    system.string
.OUTPUTS
    HPE.SimpliVity.Externalstore
.NOTES
    This command works with HPE SimpliVity 4.0.0 and above
#>
function Get-SVTexternalStore {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0)]
        [Alias("Name")]
        [System.String[]]$ExternalStoreName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    $Uri = $global:SVTconnection.OVC + '/api/external_stores?case=insensitive'
    if ($PSBoundParameters.ContainsKey('ExternalstoreName')) {
        $ExternalstoreName = $ExternalstoreName -join ','
        $Uri += '&name=' + $ExternalstoreName
    }

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    if ($PSBoundParameters.ContainsKey('ExternalStoreName') -and -not $response.external_stores.name) {
        throw "Specified external datastore(s) $ExternalStoreName not found"
    }

    $Response.external_stores | ForEach-Object {
        [PSCustomObject]@{
            PSTypeName         = 'HPE.SimpliVity.ExternalStore'
            ClusterGroupIds    = $_.cluster_group_ids
            ManagementIP       = $_.management_ip
            ManagementPort     = $_.management_port
            ExternalStoreName  = $_.name
            StoragePort        = $_.storage_port
            OmniStackClusterID = $_.omnistack_cluster_id
            Type               = $_.type
        }
    }
}

<#
.SYNOPSIS
    Registers a new external datastore with the specified HPE SimpliVity cluster
.DESCRIPTION
    Registers an external datastore. Upon creation, external datastores are associated with a specific
    HPE SimpliVity cluster, but are subsequently available to all clusters in the cluster group to which
    the specified cluster is a member.
 
    External Stores are preconfigured Catalyst stores on HPE StoreOnce appliances that provide air gapped
    backups to HPE SimpliVity. The external datastore must be created and configured appropriately to allow
    the registration to successfully complete.
.PARAMETER ExternalStoreName
    External datastore name. This is the pre-existing Catalyst store name on HPE StoreOnce
.PARAMETER ClusterName
    The HPE SimpliVity cluster name to associate this external store. Once created, the external store is
    available to all clusters in the cluster group
.PARAMETER ManagementIP
    The IP Address of the external store appliance
.PARAMETER Username
    The username associated with the external datastore. HPE SimpliVity uses this to authenticate and
    access the external datastore
.PARAMETER Userpass
    The password for the specified username
.PARAMETER ManagementPort
    The management port to use for the external storage appliance
.PARAMETER StoragePort
    The storage port to use for the external storage appliance
.EXAMPLE
    PS C:\>New-SVTexternalStore -ExternalstoreName StoreOnce-Data03 -ClusterName SVTcluster
        -ManagementIP 192.168.10.202 -Username SVT_service -Userpass Password123
 
    Registers a new external datastore called StoreOnce-Data03 with the specified HPE SimpliVity Cluster,
    using preconfigured credentials.
.INPUTS
    system.string
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
    This command works with HPE SimpliVity 4.0.0 and above
#>
function New-SVTexternalStore {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$ExternalStoreName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$ClusterName,

        [Parameter(Mandatory = $true, Position = 2)]
        [System.String]$ManagementIP,

        [Parameter(Mandatory = $true, Position = 3)]
        [System.String]$Username,

        [Parameter(Mandatory = $true, Position = 4)]
        [System.String]$Userpass,

        [Parameter(Mandatory = $false, Position = 5)]
        [System.Int32]$ManagementPort = 9387,

        [Parameter(Mandatory = $false, Position = 6)]
        [System.Int32]$StoragePort = 9388
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.14+json'
    }
    
    $Uri = $global:SVTconnection.OVC + '/api/external_stores'

    try {
        $ClusterId = Get-SVTcluster -ClusterName $ClusterName | Select-Object -ExpandProperty ClusterId
    }
    catch {
        $_.Exception.Message
    }
    
    $Body = @{
        'management_ip'        = $ManagementIP
        'management_port'      = $ManagementPort
        'name'                 = $ExernalStoreName
        'omnistack_cluster_id' = $ClusterID
        'password'             = $Userpass
        'storage_port'         = $StoragePort
        'username'             = $Username
    } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used

}

#endregion Datastore

#region Host

<#
.SYNOPSIS
    Display HPE SimpliVity host information
.DESCRIPTION
    Shows host information from the SimpliVity Federation.
.PARAMETER HostName
    Show the specified host only
.PARAMETER ClusterName
    Show hosts from the specified SimpliVity cluster only
.EXAMPLE
    PS C:\> Get-SVThost
 
    Shows all hosts in the Federation
.EXAMPLE
    PS C:\> Get-SVThost -Name Host01
    PS C:\> Get-SVThost Host01,Host02
 
    Shows the specified host(s)
.EXAMPLE
    PS C:\> Get-SVThost -ClusterName MyCluster
 
    Shows hosts in specified HPE SimpliVity cluster(s)
.EXAMPLE
    PS C:\> Get-SVTHost | Where-Object DataCenter -eq MyDC | Format-List *
 
    Shows all properties for all hosts in the specified Datacenter
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Host
.NOTES
#>
function Get-SVThost {
    [CmdletBinding(DefaultParameterSetName = 'ByHostName')]
    param (
        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'ByHostName')]
        [Alias("Name")]
        [System.String[]]$HostName,

        [Parameter(Mandatory = $false, ParameterSetName = 'ByClusterName')]
        [System.String[]]$ClusterName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }
    $Uri = $global:SVTconnection.OVC + '/api/hosts?show_optional_fields=true&case=insensitive'
    $LocalFormat = Get-SVTLocalDateFormat
    
    if ($PSBoundParameters.ContainsKey('ClusterName')) {
        $ClusterName = $ClusterName -join ','
        $Uri += '&compute_cluster_name=' + $ClusterName
    }

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    if ($PSBoundParameters.ContainsKey('ClusterName') -and -not $Response.hosts.name) {
        throw "Specified cluster(s) $ClusterName not found"
    }

    if ($PSBoundParameters.ContainsKey('HostName')) {
        try {
            $FullHostName = Resolve-SVTFullHostName $HostName $Response.hosts.name
            foreach ($Thishost in $FullHostName) {
                [array]$MatchedHost += $Response.hosts | ForEach-Object { 
                    $_ | Where-Object { $_.name -eq $Thishost }
                }
            }
            $Response = @{ hosts = $MatchedHost }  # repack the object with just the host objects we want
        }
        catch {
            throw $_.Exception.Message
        }
    }

    $Response.hosts | Foreach-Object {
        if ($_.date -as [datetime]) {
            $Date = Get-Date -Date $_.date -Format $LocalFormat
        }
        else {
            $Date = $null
        }
        [PSCustomObject]@{
            PSTypeName               = 'HPE.SimpliVity.Host'
            PolicyEnabled            = $_.policy_enabled
            ClusterId                = $_.omnistack_cluster_id
            StorageMask              = $_.storage_mask
            PotentialFeatureLevel    = $_.potential_feature_level
            Type                     = $_.type
            CurrentFeatureLevel      = $_.current_feature_level
            HypervisorId             = $_.hypervisor_object_id
            ClusterName              = $_.compute_cluster_name
            ManagementIP             = $_.management_ip
            FederationIP             = $_.federation_ip
            VirtualControllerName    = $_.virtual_controller_name
            FederationMask           = $_.federation_mask
            Model                    = $_.model
            DataCenterId             = $_.compute_cluster_parent_hypervisor_object_id
            HostId                   = $_.id
            StoreageMTU              = $_.storage_mtu
            State                    = $_.state
            UpgradeState             = $_.upgrade_state
            FederationMTU            = $_.federation_mtu
            CanRollback              = $_.can_rollback
            StorageIP                = $_.storage_ip
            ManagementMTU            = $_.management_mtu
            Version                  = $_.version
            HostName                 = $_.name
            DataCenterName           = $_.compute_cluster_parent_name
            HypervisorManagementIP   = $_.hypervisor_management_system
            ManagementMask           = $_.management_mask
            HypervisorManagementName = $_.hypervisor_management_system_name
            HypervisorClusterId      = $_.compute_cluster_hypervisor_object_id
            ClusterGroupIds          = $_.cluster_group_ids
            Date                     = $Date
            UsedLogicalCapacityGB    = '{0:n0}' -f ($_.used_logical_capacity / 1gb)
            UsedCapacityGB           = '{0:n0}' -f ($_.used_capacity / 1gb)
            CompressionRatio         = $_.compression_ratio
            StoredUnCompressedDataGB = '{0:n0}' -f ($_.stored_uncompressed_data / 1gb)
            StoredCompressedDataGB   = '{0:n0}' -f ($_.stored_compressed_data / 1gb)
            EfficiencyRatio          = $_.efficiency_ratio
            DeduplicationRatio       = $_.deduplication_ratio
            LocalBackupCapacityGB    = '{0:n0}' -f ($_.local_backup_capacity / 1gb)
            CapacitySavingsGB        = '{0:n0}' -f ($_.capacity_savings / 1gb)
            AllocatedCapacityGB      = '{0:n0}' -f ($_.allocated_capacity / 1gb)
            StoredVmDataGB           = '{0:n0}' -f ($_.stored_virtual_machine_data / 1gb)
            RemoteBackupCapacityGB   = '{0:n0}' -f ($_.remote_backup_capacity / 1gb)
            FreeSpaceGB              = '{0:n0}' -f ($_.free_space / 1gb)
        }
    }
}

<#
.SYNOPSIS
    Display HPE SimpliVity host hardware information
.DESCRIPTION
    Shows host hardware information for the specified host(s). Some properties are
    arrays, from the REST API response. Information in these properties can be enumerated as
    usual. See examples for details.
.PARAMETER HostName
    Show information for the specified host only
.EXAMPLE
    PS C:\> Get-SVThardware -HostName Host01 | Select-Object -ExpandProperty LogicalDrives
 
    Enumerates all of the logical drives from the specified host
.EXAMPLE
    PS C:\> (Get-SVThardware Host01).RaidCard
 
    Enumerate all of the RAID cards from the specified host
.EXAMPLE
    PC C:\> Get-SVThardware Host1,Host2,Host3
 
    Shows hardware information for all hosts in the specified list
.INPUTS
    System.String
    HPE.SimpliVity.Host
.OUTPUTS
    HPE.SimpliVity.Hardware
.NOTES
#>
function Get-SVThardware {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String[]]$HostName
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
        }

        $Allhost = Get-SVThost
        if ($PSBoundParameters.ContainsKey('HostName')) {
            try {
                $HostName = Resolve-SVTFullHostName $HostName $Allhost.HostName -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }
        }
        else {
            $HostName = $Allhost | Select-Object -ExpandProperty HostName
        }
    }

    process {
        foreach ($Thishost in $HostName) {
            # Get the HostId for this host
            $HostId = ($Allhost | Where-Object HostName -eq $Thishost).HostId

            $Uri = $global:SVTconnection.OVC + '/api/hosts/' + $HostId + '/hardware'

            try {
                $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }
            $Response.host | ForEach-Object {
                [pscustomobject]@{
                    PSTypeName       = 'HPE.SimpliVity.Hardware'
                    HostName         = $_.name
                    HostId           = $_.host_id
                    SerialNumber     = $_.serial_number
                    Manufacturer     = $_.manufacturer
                    Model            = $_.model_number
                    FirmwareRevision = $_.firmware_revision
                    Status           = $_.status
                    RaidCard         = $_.raid_card
                    Battery          = $_.battery
                    AcceleratorCard  = $_.accelerator_card
                    LogicalDrives    = $_.logical_drives
                }
            } #end foreach-object
        } # end foreach
    } # end process
}

<#
.SYNOPSIS
    Display HPE SimpliVity physical disk information
.DESCRIPTION
    Shows physical disk information for the specified host(s). This includes the
    installed storage kit, which is not provided by the API, but it derived from
    the host model, the number of disks and the disk capacities.
.PARAMETER HostName
    Show information for the specified host only
.EXAMPLE
    PS C:\> Get-SVTdisk
 
    Shows physical disk information for all SimpliVity hosts in the federation.
.EXAMPLE
    PS C:\> Get-SVTdisk -HostName Host01
 
    Shows physical disk information for the specified SimpliVity host.
.EXAMPLE
    PS C:\> Get-SVTdisk -HostName Host01 | Select-Object -First 1 | Format-List
 
    Show all of the available information about the first disk on the specified host.
.EXAMPLE
    PC C:\> Get-SVThost -Cluster PROD | Get-SVTdisk
 
    Shows physical disk information for all hosts in the specified cluster.
.EXAMPLE
    PC C:\> Get-SVThost Host1,Host2,Host3
 
    Shows physical disk information for all hosts in the specified list
.INPUTS
    System.String
    HPE.SimpliVity.Host
.OUTPUTS
    HPE.SimpliVity.Hardware
.NOTES
#>
function Get-SVTdisk {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String[]]$HostName
    )

    begin {
        $Hardware = Get-SVThardware
        if ($PSBoundParameters.ContainsKey('HostName')) {
            try {
                $HostName = Resolve-SVTFullHostName $HostName $Hardware.HostName -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }
        }
        else {
            $HostName = $Hardware | Select-Object -ExpandProperty HostName
        }
    }

    process {
        foreach ($Thishost in $HostName) {
            $HostHardware = $Hardware | Where-Object HostName -eq $Thishost
            
            # We MUST sort by slot number to ensure SSDs are at the top to properly support 380 H
            # This command removes duplicates - all models have at least two logical disks where physical
            # disks would otherwise appear twice in the collection.
            $Disk = $HostHardware.logicaldrives.drive_sets.physical_drives | 
            Sort-Object { [system.Int32]($_.Slot -replace '(\d+).*', '$1') } |
            Get-Unique -AsString
            
            # Check capacity of first disk in collection (works ok all most models - 380 H included, for now)
            $DiskCapacity = [int][math]::Ceiling(($Disk | Select-Object -First 1).capacity / 1TB)
            $DiskCount = ($Disk | Measure-Object).Count
            
            $SVTmodel = Get-SVTmodel | Where-Object {
                $HostHardware.Model -match $_.Model -and
                $DiskCount -eq $_.DiskCount -and
                $DiskCapacity -eq $_.DiskCapacity
            }

            if ($SVTmodel) {
                $Kit = $SVTmodel.StorageKit
            }
            else {
                $Kit = 'Unknown Storage Kit'
            }

            $Disk | ForEach-Object {
                [pscustomobject]@{
                    PSTypeName      = 'HPE.SimpliVity.Disk'
                    SerialNumber    = $_.serial_number
                    Manufacturer    = $_.manufacturer
                    ModelNumber     = $_.model_number
                    Firmware        = $_.firmware_revision
                    Status          = $_.status
                    Health          = $_.health
                    Enclosure       = [System.Int32]$_.enclosure
                    Slot            = [System.Int32]$_.slot
                    CapacityTB      = [single]('{0:n2}' -f ($_.capacity / 1000000000000))
                    WWN             = $_.wwn
                    PercentRebuilt  = [System.Int32]$_.percent_rebuilt
                    AddtionalStatus = $_.additional_status
                    MediaType       = $_.media_type
                    DrivePosition   = $_.drive_position
                    HostStorageKit  = $Kit
                    HostName        = $ThisHost
                }
            } # end foreach disk
        } #end foreach host
    } #end process
}

<#
.SYNOPSIS
    Display capacity information for the specified SimpliVity node
.DESCRIPTION
    Displays capacity information for a number of useful metrics, such as
    Free space, used capacity, compression ratio and efficiency ratio over time
    for a specified SimpliVity node.
.PARAMETER HostName
    The SimpliVity node you want to show capacity information for
.PARAMETER OffsetHour
    Offset in hours from now.
.PARAMETER Hour
    The range in hours (the duration from the specified point in time)
.PARAMETER Resolution
    The resolution in seconds, minutes, hours or days
.PARAMETER Chart
    Create a chart from capacity information. If more than one host is passed in, a chart
    for each host is created.
.EXAMPLE
    PS C:\>Get-SVTcapacity MyHost
 
    Shows capacity information for the specified host for the last 24 hours
.EXAMPLE
    PS C:\>Get-SVTcapacity -HostName MyHost -Hour 1 -Resolution MINUTE
 
    Shows capacity information for the specified host showing every minute for the last hour
.EXAMPLE
    PS C:\>Get-SVTcapacity -Chart
 
    Creates a chart for each host in the SimpliVity federation showing the latest (24 hours) capacity details
.EXAMPLE
    PC C:\> Get-SVTcapacity Host1,Host2,Host3
 
    Shows capacity information for all hosts in the specified list
.INPUTS
    system.string
    HPESimpliVity.Host
.OUTPUTS
    HPE.SimpliVity.Capacity
.NOTES
#>
function Get-SVTcapacity {
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory = $false, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [string[]]$HostName,

        [Parameter(Mandatory = $false, Position = 1)]
        [System.Int32]$OffsetHour = 0,

        [Parameter(Mandatory = $false, Position = 2)]
        [System.Int32]$Hour = 24,

        [Parameter(Mandatory = $false, Position = 3)]
        [ValidateSet('SECOND', 'MINUTE', 'HOUR', 'DAY')]
        [System.String]$Resolution = 'HOUR',

        [Parameter(Mandatory = $false)]
        [switch]$Chart
    )

    begin {
        #$VerbosePreference = 'Continue'

        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
        }
        $LocalFormat = Get-SVTLocalDateFormat
        $Range = $Hour * 3600
        $Offset = $OffsetHour * 3600

        $Allhost = Get-SVThost
        if ($PSBoundParameters.ContainsKey('HostName')) {
            try {
                $HostName = Resolve-SVTFullHostName $HostName $Allhost.HostName -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }
        }
        else {
            $HostName = $Allhost | Select-Object -ExpandProperty HostName
        }

        if ($Resolution -eq 'SECOND' -and $Range -gt 43200 ) {
            throw "Maximum range value for resolution $resolution is 12 hours"
        }
        elseif ($Resolution -eq 'MINUTE' -and $Range -gt 604800 ) {
            throw "Maximum range value for resolution $resolution is 168 hours (1 week)"
        }
        elseif ($Resolution -eq 'HOUR' -and $Range -gt 5184000 ) {
            throw "Maximum range value for resolution $resolution is 1,440 hours (2 months)"
        }
        elseif ($Resolution -eq 'DAY' -and $Range -gt 94608000 ) {
            throw "Maximum range value for resolution $resolution is 26,280 hours (3 years)"
        }

        if ($Resolution -eq 'SECOND' -and $Range -gt 3600 ) {
            Write-Warning 'Using the resolution of SECOND beyond a range of 1 hour can take a long time to complete'
        }
        if ($Resolution -eq 'MINUTE' -and $Range -gt 43200 ) {
            Write-Warning 'Using the resolution of MINUTE beyond a range of 12 hours can take a long time to complete'
        }
    }

    process {
        foreach ($Thishost in $HostName) {
            $HostId = ($Allhost | Where-Object HostName -eq $Thishost).HostId

            $Uri = $global:SVTconnection.OVC + '/api/hosts/' + $HostId + '/capacity?time_offset=' +
            $Offset + '&range=' + $Range + '&resolution=' + $Resolution
            
            try {
                $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }

            # Unpack the Json into a Custom object. This returns each Metric with a date and value
            $CustomObject = $Response.metrics | foreach-object {
                $MetricName = ($_.name -split '_' | 
                    ForEach-Object { 
                        (Get-Culture).TextInfo.ToTitleCase($_) 
                    }
                ) -join ''

                $_.data_points | ForEach-Object {
                    if ($_.date -as [DateTime]) {
                        $Date = Get-Date -Date $_.date -Format $LocalFormat
                    }
                    else {
                        $Date = $null
                    }
                    [pscustomobject] @{
                        Name  = $MetricName
                        Date  = $Date
                        Value = $_.value
                    }
                }
            }

            # Transpose the custom object to return each date with the value for each metric
            $CapacityObject = $CustomObject | Sort-Object -Property Date | Group-Object -Property Date | 
            ForEach-Object {
                $Property = [ordered]@{
                    PStypeName = 'HPE.SimpliVity.Capacity'
                    Date       = $_.Name
                }
                $_.Group | Foreach-object {
                    if ($_.Name -match "Ratio") {
                        $Property += @{
                            "$($_.Name)" = '{0:n2}' -f $_.Value
                        }
                    }
                    else {
                        $Property += @{
                            "$($_.Name)" = $_.Value
                        }
                    }
                }
                $Property += @{ HostName = $Thishost }
                New-Object -TypeName PSObject -Property $Property
            }

            if ($PSBoundParameters.ContainsKey('Chart')) {
                $ChartObject += $CapacityObject
            }
            else {
                $CapacityObject
            }
        }
    }

    end {
        if ($PSBoundParameters.ContainsKey('Chart')) {
            Get-SVTcapacityChart -Capacity $ChartObject
        }
    }
}

<#
.SYNOPSIS
    Removes a HPE SimpliVity node from the cluster/federation
.DESCRIPTION
    Removes a HPE SimpliVity node from the cluster/federation. Once this command is executed, the specified
    node must be factory reset and can then be redeployed using the Deployment Manager. This command is
    equivalent GUI command "Remove from federation"
 
    If there are any virtual machines running on the node or if the node is not HA-compliant, this command
    will fail. You can specify the force command, but we aware that this could cause data loss.
.PARAMETER HostName
    Specify the node to remove.
.PARAMETER Force
    Forces removal of the node from the HPE SimpliVity federation. THIS CAN CAUSE DATA LOSS. If there is one
    node left in the cluster, this parameter must be specified (removes HA compliance for any VMs in the
    affected cluster.)
.EXAMPLE
    PS C:\>Remove-SVThost -HostName Host01
 
    Removes the node from the federation providing there are no VMs running and providing the
    node is HA-compliant.
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Remove-SVThost {
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$HostName,

        [switch]$Force
    )

    # V4.0.0 states this is now application/vnd.simplivity.v1.14+json,
    # but there don't appear to be any new features
    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }
    try {
        $HostId = Get-SVThost -HostName $HostName -ErrorAction Stop | Select-Object -ExpandProperty HostId
        $Uri = $global:SVTconnection.OVC + '/api/hosts/' + $HostId + '/remove_from_federation'
    }
    catch {
        throw $_.Exception.Message
    }

    $ForceHostRemoval = $false
    if ($PSBoundParameters.ContainsKey('Force')) {
        $ForceHostRemoval = $true
    }

    $Body = @{ 'force' = $ForceHostRemoval } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Shutdown a HPE Omnistack Virtual Controller
.DESCRIPTION
     Ideally, you should only run this command when all the VMs in the cluster
     have been shutdown, or if you intend to leave virtual controllers running in the cluster.
 
     This RESTAPI call only works if executed on the local host to the virtual controller. So this command
     connects to the virtual controller on the specified host to shut it down.
 
     Note: Once the shutdown is executed on the specified host, this command will reconnect to another
     operational virtual controller in the Federation, using the same credentials, if there is one.
.PARAMETER HostName
    Specify the host name running the OmniStack virtual controller to shutdown
.EXAMPLE
    PS C:\> Start-SVTshutdown -HostName <Name of SimpliVity host>
 
    if not the last operational virtual controller, this command waits for the affected VMs to be HA
    compliant. If it is the last virtual controller, the shutdown does not wait for HA compliance.
 
    You will be prompted before the shutdown. If this is the last virtual controller, ensure all virtual
    machines are powered off, otherwise there may be loss of data.
.EXAMPLE
    PS C:\> Start-SVTshutdown -HostName Host01 -Confirm:$false
 
    Shutdown the specified virtual controller without confirmation. If this is the last virtual controller,
    ensure all virtual machines are powered off, otherwise there may be loss of data.
.EXAMPLE
    PS C:\> Start-SVTshutdown -HostName Host01 -Whatif -Verbose
 
    Reports on the shutdown operation, including connecting to the virtual controller, without actually
    performing the shutdown.
.INPUTS
    System.String
.OUTPUTS
    System.Management.Automation.PSCustomObject
.NOTES
#>
function Start-SVTshutdown {
    [CmdletBinding(SupportsShouldProcess = $true, ConfirmImpact = 'High')]
    param (
        [Parameter(Mandatory = $true, Position = 0, ParameterSetName = 'ByHostName')]
        [System.String]$HostName
    )

    $VerbosePreference = 'Continue'
    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/json'
    }

    try {
        $Allhost = Get-SVThost -ErrorAction Stop
        $ThisHost = $Allhost | Where-Object HostName -eq $HostName
        
        $NextHost = $Allhost | Where-Object { $_.HostName -ne $HostName -and $_.State -eq 'ALIVE' } | 
        Select-Object -First 1 # so we can reconnect afterwards
        $ThisCluster = $ThisHost | Select-Object -First 1 -ExpandProperty Clustername

        $LiveHost = $Allhost | Where-Object { $_.ClusterName -eq $ThisCluster -and $_.State -eq 'ALIVE' } | 
        Measure-Object | Select-Object -ExpandProperty Count

        $Allhost | Where-Object ClusterName -eq $ThisCluster | ForEach-Object {
            Write-Verbose "Current state of host $($_.HostName) in cluster $ThisCluster is $($_.State)" 
        }
    }
    catch {
        throw $_.Exception.Message
    }

    # Exit if the virtual controller is already off
    if ($ThisHost.State -ne 'ALIVE') {
        throw "The HPE Omnistack Virtual Controller on $($ThisHost.HostName) is not running"
    } 

    if ($NextHost) {
        Write-Verbose "This command will reconnect to $($NextHost.HostName) following the shutdown of the virtual controller on $($ThisHost.HostName)"
    }
    else {
        Write-Verbose "This is the last operational HPE Omnistack Virtual Controller in the federation, reconnect not possible"
    }

    # Connect to the target virtual controller, using the existing credentials saved to $SVTconnection
    try {
        Write-Verbose "Connecting to $($ThisHost.VirtualControllerName) on host $($ThisHost.HostName)..."
        Connect-SVT -OVC $ThisHost.ManagementIP -Credential $SVTconnection.Credential | Out-Null
        Write-Verbose "Successfully connected to $($ThisHost.VirtualControllerName) on host $($ThisHost.HostName)"
    }
    catch {
        throw $_.Exception.Message
    }

    # Confirm if this is the last running virtual controller in this cluster
    Write-Verbose "$LiveHost operational HPE Omnistack virtual controller(s) in the $ThisCluster cluster"
    if ($LiveHost -lt 2) {
        Write-Warning "This is the last Omnistack virtual controller running in the $ThisCluster cluster"
        Write-Warning "Using this command with confirm turned off could result in loss of data if you have not already powered off all virtual machines"
    }

    # Only execute the command if confirmed. Using -Whatif will report only
    if ($PSCmdlet.ShouldProcess("$($ThisHost.HostName)", "Shutdown virtual controller in cluster $ThisCluster")) {
        try {
            $Uri = $global:SVTconnection.OVC + '/api/hosts/' + $ThisHost.HostId + '/shutdown_virtual_controller'
            $Body = @{ 'ha_wait' = $true } | ConvertTo-Json
            Write-Verbose $Body
            $null = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
        }
        catch {
            throw $_.Exception.Message
        }

        if ($LiveHost -le 1) {
            Write-Verbose 'Sleeping 10 seconds before issuing final shutdown...'
            Start-Sleep -Seconds 10

            try {
                # Instruct the shutdown task running on the last virtual controller in the cluster not to
                # wait for HA compliance
                $Body = @{'ha_wait' = $false } | ConvertTo-Json
                Write-Verbose $Body
                $null = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }

            Write-Output "Shutting down the last virtual controller in the $ThisCluster cluster " +
            "now ($($ThisHost.HostName))"  
        }

        if ($NextHost) {
            try {
                Write-Verbose "Reconnecting to $($NextHost.VirtualControllerName) on $($NextHost.HostName)..."
                Connect-SVT -OVC $NextHost.ManagementIP -Credential $SVTconnection.Credential | Out-Null
                Write-Verbose "Successfully reconnected to $($NextHost.VirtualControllerName) on $($NextHost.HostName)"

                $OVCrunning = $true
                Write-Verbose "Wait to allow the storage IP to failover to an operational virtual controller. This may take a long time if the host is running virtual machines."
                do {
                    Write-verbose "Waiting 30 seconds, do not issue additional shutdown commands until this operation completes..."
                    Start-Sleep -Seconds 30
                    
                    $OVCstate = Get-SVThost -HostName $($ThisHost.HostName) | 
                    Select-Object -ExpandProperty State

                    if ($OVCstate -eq "FAULTY") {
                        $OVCrunning = $false
                    }
                } while ($OVCrunning)

                Write-Output "Successfully shutdown the virtual controller on $($ThisHost.HostName)"
            }
            catch {
                throw $_.Exception.Message
            }
        }
        else {
            Write-Verbose "This was the last operational HPE Omnistack Virtual Controller in the Federation, reconnect not possible"
        }
    }
}

<#
.SYNOPSIS
    Get the shutdown status of one or more Omnistack Virtual Controllers
.DESCRIPTION
    This RESTAPI call only works if executed on the local host to the OVC. So this cmdlet
    iterates through the specified hosts and connects to each specified host to sequentially get the status.
 
    This RESTAPI call only works if status is 'None' (i.e. the OVC is responsive), which kind of renders
    the REST API a bit useless. However, this cmdlet is still useful to identify the unresponsive (i.e shut
    down or shutting down) OVC(s).
 
    Note, because we're connecting to each OVC, the connection token will point to the last OVC we
    successfully connect to. You may want to reconnect to your preferred OVC again using Connect-SVT.
.PARAMETER HostName
    Show shutdown status for the specified host only
.EXAMPLE
    PS C:\> Get-SVTshutdownStatus
 
    Connect to all OVCs in the Federation and show their shutdown status
.EXAMPLE
    PS C:\> Get-SVTshutdownStatus -HostName <Name of SimpliVity host>
 
.EXAMPLE
    PS C:\> Get-SVThost -Cluster MyCluster | Get-SVTshutdownStatus
 
    Shows all shutdown status for all the OVCs in the specified cluster
    HostName is passed in from the pipeline, using the property name
.EXAMPLE
    PS C:\> '10.10.57.59','10.10.57.61' | Get-SVTshutdownStatus
 
    HostName is passed in them the pipeline by value. Same as:
    Get-SVTshutdownStatus -HostName '10.10.57.59','10.10.57.61'
.INPUTS
    System.String
    HPE.SimpliVity.Host
.OUTPUTS
    System.Management.Automation.PSCustomObject
.NOTES
#>
function Get-SVTshutdownStatus {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String[]]$HostName
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.1+json'
        }

        $Allhost = Get-SVThost
        if ($PSBoundParameters.ContainsKey('HostName')) {
            try {
                $HostName = Resolve-SVTFullHostName $HostName $Allhost.HostName -ErrorAction Stop
            }
            catch {
                throw $_.Exception.Message
            }
        }
        else {
            $HostName = $Allhost | Select-Object -ExpandProperty HostName
        }
    }

    process {
        foreach ($ThisHostName in $HostName) {
            $ThisHost = $Allhost | Where-Object HostName -eq $ThisHostName

            try {
                Connect-SVT -OVC $ThisHost.ManagementIP -Credential $SVTconnection.Credential -ErrorAction Stop | 
                Out-Null
                
                Write-Verbose $SVTconnection
            }
            catch {
                Write-Error "The virtual controller $($ThisHost.ManagementName) on host $ThisHostName is not responding"
                continue
            }

            try {
                $Uri = $global:SVTconnection.OVC + '/api/hosts/' + $ThisHost.HostId + 
                '/virtual_controller_shutdown_status'
                $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
            }
            catch {
                Write-Error "Error connecting to $($ThisHost.ManagementIP) (host $ThisHostName). Check that it is running"
                continue
            }

            $Response.shutdown_status | ForEach-Object {
                [PSCustomObject]@{
                    HostName              = $ThisHostName
                    VirtualControllerName = $ThisHost.VirtualControllerName
                    ManagementIP          = $ThisHost.ManagementIP
                    ShutdownStatus        = $_.Status
                }
            }
        } #end foreach hostname
    } #end process
}

<#
.SYNOPSIS
    Cancel the previous shutdown command for one or more OmniStack Virtual Controllers
.DESCRIPTION
    Cancels a previously executed shutdown request for one or more OmniStack Virtual Controllers
 
    This RESTAPI call only works if executed on the local OVC. So this cmdlet iterates through the specified
    hosts and connects to each specified host to sequentially shutdown the local OVC.
 
    Note, once executed, you'll need to reconnect back to a surviving OVC, using Connect-SVT to continue
    using the HPE SimpliVity cmdlets.
.PARAMETER HostName
    Specify the HostName running the OmniStack virtual controller to cancel the shutdown task on
.EXAMPLE
    PS C:\> Stop-SVTshutdown -HostName Host01
.INPUTS
    System.String
    HPE.SimpliVity.Host
.OUTPUTS
    System.Management.Automation.PSCustomObject
.NOTES
#>
function Stop-SVTshutdown {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String[]]$HostName
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/json'
        }

        # Get all the hosts in the Federation.
        # We will be cancelling shutdown for one or more OVC's; grab all host information before we start
        try {
            $Allhost = Get-SVThost -ErrorAction Stop
        }
        catch {
            throw $_.Exception.Message
        }
    }

    process {
        foreach ($ThisHostName in $HostName) {
            # grab this host object from the collection
            $ThisHost = $Allhost | Where-Object HostName -eq $ThisHostName
            Write-Verbose $($ThisHost | Select-Object HostName, HostId)

            # Now connect to this host, using the existing credentials saved to global variable
            Connect-SVT -OVC $ThisHost.ManagementIP -Credential $SVTconnection.Credential | Out-Null
            Write-Verbose $SVTconnection

            $Uri = $global:SVTconnection.OVC + '/api/hosts/' + $ThisHost.HostId + '/cancel_virtual_controller_shutdown'

            try {
                $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Post -ErrorAction Stop
            }
            catch {
                Write-Warning "$($_.Exception.Message), failed to stop the shutdown process on host $ThisHostName"
            }

            $Response.cancellation_status | ForEach-Object {
                [PSCustomObject]@{
                    VirtualController  = $ThisHost.ManagementIP
                    CancellationStatus = $_.Status
                }
            }
        } # end foreach host
    } # end process
}

#endregion Host

#region Cluster

<#
.SYNOPSIS
    Display HPE SimpliVity cluster information
.DESCRIPTION
    Shows cluster information from the SimpliVity Federation
.PARAMETER ClusterName
    Show information about the specified cluster only
.EXAMPLE
    PS C:\>Get-SVTcluster
 
    Shows information about all clusters in the Federation
.EXAMPLE
    PS C:\>Get-SVTcluster Prod01
    PS C:\>Get-SVTcluster -Name Prod01
 
    Shows information about the specified cluster
.EXAMPLE
    PS C:\>Get-SVTcluster cluster1,cluster2
 
    Shows information about the specified clusters
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Cluster
.NOTES
#>
function Get-SVTcluster {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0)]
        [Alias("Name")]
        [System.String[]]$ClusterName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    $Uri = $global:SVTconnection.OVC + '/api/omnistack_clusters?show_optional_fields=true&case=insensitive'

    if ($PSBoundParameters.ContainsKey('ClusterName')) {
        $ClusterName = $ClusterName -join ','
        $Uri += '&name=' + $ClusterName
    }

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    if ($PSBoundParameters.ContainsKey('ClusterName') -and -not $response.omnistack_clusters.name) {
        throw "Specified cluster(s) $ClusterName not found"
    }

    $Response.omnistack_clusters | ForEach-Object {
        [PSCustomObject]@{
            PSTypeName               = 'HPE.SimpliVity.Cluster'
            DataCenterName           = $_.hypervisor_object_parent_name
            DataCenterId             = $_.hypervisor_object_parent_id
            Type                     = $_.type
            Version                  = $_.version
            HypervisorClusterId      = $_.hypervisor_object_id
            Members                  = $_.members
            ClusterName              = $_.name
            ArbiterIP                = $_.arbiter_address
            ArbiterConnected         = $_.arbiter_connected
            ArbiterRequired          = $_.arbiter_required
            ArbiterConfigured        = $_.arbiter_configured
            HypervisorType           = $_.hypervisor_type
            ClusterId                = $_.id
            HypervisorIP             = $_.hypervisor_management_system
            HypervisorName           = $_.hypervisor_management_system_name
            UsedLogicalCapacityGB    = '{0:n0}' -f ($_.used_logical_capacity / 1gb)
            UsedCapacityGB           = '{0:n0}' -f ($_.used_capacity / 1gb)
            CompressionRatio         = $_.compression_ratio
            StoredUnCompressedDataGB = '{0:n0}' -f ($_.stored_uncompressed_data / 1gb)
            StoredCompressedDataGB   = '{0:n0}' -f ($_.stored_compressed_data / 1gb)
            EfficiencyRatio          = $_.efficiency_ratio
            UpgradeTaskId            = $_.upgrade_task_id
            DeduplicationRatio       = $_.deduplication_ratio
            UpgradeState             = $_.upgrade_state
            LocalBackupCapacityGB    = '{0:n0}' -f ($_.local_backup_capacity / 1gb)
            ClusterGroupIds          = $_.cluster_group_ids
            TimeZone                 = $_.time_zone
            InfoSightRegistered      = $_.infosight_configuration.infosight_registered
            InfoSightEnabled         = $_.infosight_configuration.infosight_enabled
            InfoSightProxyURL        = $_.infosight_configuration.infosight_proxy_url
            ClusterFeatureLevel      = $_.cluster_feature_level
            IwoEnabled               = $_.iwo_enabled
            CapacitySavingsGB        = '{0:n0}' -f ($_.capacity_savings / 1gb)
            AllocatedCapacityGB      = '{0:n0}' -f ($_.allocated_capacity / 1gb)
            StoredVmDataGB           = '{0:n0}' -f ($_.stored_virtual_machine_data / 1gb)
            RemoteBackupCapacityGB   = '{0:n0}' -f ($_.remote_backup_capacity / 1gb)
            FreeSpaceGB              = '{0:n0}' -f ($_.free_space / 1gb)
        }
    }
}

<#
.SYNOPSIS
    Display information about HPE SimpliVity cluster throughput
.DESCRIPTION
    Calculates the throughput between each pair of omnistack_clusters in the federation
.PARAMETER ClusterName
    Specify a cluster name
.PARAMETER Hour
    Show throughput for the specified number of hours (starting from OffsetHour)
.PARAMETER OffsetHour
    Show throughput starting from the specified offset (hours from now, default is now)
.EXAMPLE
    PS C:\>Get-SVTthroughput
 
    Displays the throughput information for the first cluster in the Federation, (alphabetically,
    by name)
.EXAMPLE
    PS C:\>Get-SVTthroughput -Cluster Prod01
 
    Displays the throughput information for the specified cluster
.INPUTS
    None
.OUTPUTS
    PSCustomObject
.NOTES
#>
function Get-SVTthroughput {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0)]
        [System.String]$ClusterName = (Get-SVTcluster | 
            Sort-Object ClusterName | Select-Object -ExpandProperty ClusterName -First 1),

        [Parameter(Mandatory = $false, Position = 1)]
        [System.Int32]$Hour = 12,

        [Parameter(Mandatory = $false, Position = 2)]
        [System.Int32]$OffsetHour = 0
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    $Range = $Hour * 3600
    $Offset = $OffsetHour * 3600
    $LocalFormat = Get-SVTLocalDateFormat
    

    try {
        $ClusterId = Get-SVTcluster -ClusterName $ClusterName -ErrorAction Stop | 
        Select-Object -ExpandProperty ClusterId

        $Uri = $global:SVTconnection.OVC + '/api/omnistack_clusters/' + $ClusterId + '/throughput'
    }
    catch {
        throw $_.Exception.Message
    }

    try {
        $Uri = $Uri + "?time_offset=$Offset&range=$Range"
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    $Response.cluster_throughput | ForEach-Object {
        if ($_.date -as [DateTime]) {
            $Date = Get-Date -Date $_.date -Format $LocalFormat
        }
        else {
            $Date = $null
        }
        [PSCustomObject]@{
            PSTypeName                       = 'HPE.SimpliVity.Throughput'
            Date                             = $Date
            DestinationClusterHypervisorId   = $_.destination_omnistack_cluster_hypervisor_object_parent_id
            DestinationClusterHypervisorName = $_.destination_omnistack_cluster_hypervisor_object_parent_name
            DestinationClusterId             = $_.destination_omnistack_cluster_id
            DestinationClusterName           = $_.destination_omnistack_cluster_name
            SourceClusterHypervisorId        = $_.source_omnistack_cluster_hypervisor_object_parent_id
            SourceClusterHypervisorName      = $_.source_omnistack_cluster_hypervisor_object_parent_name
            SourceClusterId                  = $_.source_omnistack_cluster_id
            SourceClusterName                = $_.source_omnistack_cluster_name
            AverageThroughputKB              = '{0:n2}' -f ($_.average_throughput / 1kb)
        }
    }
}

<#
.SYNOPSIS
    Displays the timezones that HPE SimpliVity supports
.DESCRIPTION
    Displays the timezones that HPE SimpliVity supports
.EXAMPLE
    PS C:\>Get-SVTtimezone
 
.INPUTS
    None
.OUTPUTS
    PSCustomObject
.NOTES
#>
function Get-SVTtimezone {
    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    $Uri = $global:SVTconnection.OVC + '/api/omnistack_clusters/time_zone_list'

    try {
        Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
}

<#
.SYNOPSIS
    Sets the timezone on a HPE SimpliVity cluster
.DESCRIPTION
    Sets the timezone on a HPE SimpliVity cluster
 
    Use 'Get-SVTtimezone' to see a list of valid timezones
    Use 'Get-SVTcluster | Select-Object TimeZone' to see the currently set timezone
.PARAMETER ClusterName
    Specify the cluster whose timezone you'd like set
.PARAMETER TimeZone
    Specify the valid timezone. Use Get-Timezone to see a list of valid timezones
.EXAMPLE
    PS C:\>Set-SVTtimezone -Cluster PROD -Timezone 'Australia/Sydney'
 
    Sets the time zone for the specified cluster
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Set-SVTtimezone {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$ClusterName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$TimeZone
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }

    try {
        $ClusterId = Get-SVTcluster -ClusterName $ClusterName -ErrorAction Stop | 
        Select-Object -ExpandProperty ClusterId
        
        $Uri = $global:SVTconnection.OVC + '/api/omnistack_clusters/' + $ClusterId + '/set_time_zone'

        if ($TimeZone -in (Get-SVTtimezone)) {
            $Body = @{ 'time_zone' = $TimeZone } | ConvertTo-Json
            Write-Verbose $Body
        }
        else {
            throw "Specified timezone $Timezone is not valid. Use Get-SVTtimezone to show valid timezones"
        }
    }
    catch {
        throw $_.Exception.Message
    }

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Displays information about other HPE SimpliVity clusters
.DESCRIPTION
    Displays information about other HPE SimpliVity clusters directly connected to the specified cluster
.PARAMETER ClusterName
    Specify a 'source' cluster name to display other clusters directly connected to it
 
    If no cluster is specfied, the first cluster in the Federation is used (alphabetically)
.EXAMPLE
    PS C:\>Get-SVTclusterConnected -ClusterName Production
 
    Displays information about the clusters directly connected to the specified cluster
.INPUTS
    System.String
.OUTPUTS
    PSCustomObject
.NOTES
#>
function Get-SVTclusterConnected {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0)]
        [System.String]$ClusterName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    try {
        $AllCluster = Get-SVTcluster -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    if (-Not $PSBoundParameters.ContainsKey('ClusterName')) {
        $ClusterName = $AllCluster | Sort-Object CLusterName | 
        Select-Object -First 1 -ExpandProperty ClusterName
        Write-Verbose "No cluster specified, using $ClusterName by default"
    }
    $ClusterId = $AllCluster | Where-Object ClusterName -eq $ClusterName | 
    Select-Object -ExpandProperty ClusterId
    
    try {
        $Uri = $global:SVTconnection.OVC + '/api/omnistack_clusters/' + $ClusterId + '/connected_clusters'
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    $Response.omnistack_clusters | ForEach-Object {
        [PSCustomObject]@{
            PSTypeName             = 'HPE.SimpliVity.ConnectedCluster'
            Clusterid              = $_.id
            ClusterName            = $_.name
            ClusterType            = $_.type
            ClusterMembers         = $_.members
            ArbiterConnected       = $_.arbiter_connected
            ArbiterIP              = $_.arbiter_address
            HypervisorClusterId    = $_.hypervisor_object_id
            DataCenterId           = $_.hypervisor_object_parent_id
            DataCenterName         = $_.hypervisor_object_parent_name
            HyperVisorType         = $_.hypervisor_type
            HypervisorIP           = $_.hypervisor_management_system
            HypervisorName         = $_.hypervisor_management_system_name
            ClusterVersion         = $_.version
            ConnectedClusters      = $_.connected_clusters
            InfosightConfiguration = $_.infosight_configuration
            ClusterGroupIDs        = $_.cluster_group_ids
            ClusterFeatureLevel    = $_.cluster_feature_level
        }
    }
}

#endregion Cluster

#region Policy

<#
.SYNOPSIS
    Display HPE SimpliVity backup policy rule information
.DESCRIPTION
    Shows the rules of backup policies from the SimpliVity Federation
.PARAMETER PolicyName
    Display information about the specified backup policy only
.PARAMETER RuleNumber
    If a backup policy has multiple rules, more than one object is displayed. Specify the rule number
    to display just that rule. This is useful when a rule needs to be edited or deleted.
.EXAMPLE
    PS C:\> Get-SVTpolicy
 
    Shows all policy rules for all backup policies
.EXAMPLE
    PS C:\> Get-SVTpolicy -PolicyName Silver,Gold
 
    Shows the rules from the specified backup policies
.EXAMPLE
    PS C:\> Get-SVTpolicy | Where RetentionDay -eq 7
 
    Show all policy rules that have a 7 day retention
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Policy
.NOTES
#>
function Get-SVTpolicy {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false, Position = 0)]
        [Alias("Name")]
        [System.String[]]$PolicyName,

        [Parameter(Mandatory = $false, Position = 1)]
        [System.Int32]$RuleNumber
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    $Uri = $global:SVTconnection.OVC + '/api/policies?case=insensitive'
    if ($PSBoundParameters.ContainsKey('PolicyName')) {
        $PolicyList = $PolicyName -join ','
        $Uri += '&name=' + $PolicyList
    }

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    } 

    if ($PSBoundParameters.ContainsKey('PolicyName') -and -not $Response.policies.Name) {
        throw "Specified policies(s) $PolicyList not found"
    }

    $Response.policies | ForEach-Object {
        $Policy = $_.name
        $PolicyId = $_.id
        $PolicyClusterGroupIds = $_.cluster_group_ids
        if ($_.rules) {
            $_.rules | ForEach-Object {
                # Note: Cannot check for parameter $RuleNumber using 'if (-not $Rulenumber)'
                # This matches $RuleNumber=0, which is a valid value; '0' would return all rules.
                if (-not $PSBoundParameters.ContainsKey('RuleNumber') -or $RuleNumber -eq $_.number) {
                    [PSCustomObject]@{
                        PSTypeName        = 'HPE.SimpliVity.Policy'
                        PolicyName        = $Policy
                        PolicyId          = $PolicyId
                        ClusterGroupIds   = $PolicyClusterGroupIds
                        DestinationId     = $_.destination_id
                        EndTime           = $_.end_time
                        DestinationName   = $_.destination_name
                        ConsistencyType   = $_.consistency_type
                        FrequencyHour     = $_.frequency / 60
                        AppConsistent     = $_.application_consistent
                        RuleNumber        = $_.number
                        StartTime         = $_.start_time
                        MaxBackup         = $_.max_backups
                        Day               = $_.days
                        RuleId            = $_.id
                        RetentionDay      = [math]::Round($_.retention / 1440)
                        ExternalStoreName = $_.external_store_name
                    }
                } # end if
            } # foreach rule
        }
        else {
            # Policy exists but it has no rules. This is often the case for the default policy
            [PSCustomObject]@{
                PSTypeName = 'HPE.SimpliVity.Policy'
                PolicyName = $Policy
                PolicyId   = $PolicyId
            }
        }
    }
}

<#
.SYNOPSIS
    Create a new HPE SimpliVity backup policy
.DESCRIPTION
    Create a new, empty HPE SimpliVity backup policy. To create or replace rules for the new backup
    policy, use New-SVTpolicyRule.
     
    To assign the new backup policy, use Set-SVTdatastorePolicy to assign it to a datastore, or
    Set-SVTvmPolicy to assign it to a virtual machine.
.PARAMETER PolicyName
    The new backup policy name to create
.EXAMPLE
    PS C:\>New-SVTpolicy -Policy Silver
 
    Creates a new blank backup policy. To create or replace rules for the new backup policy,
    use New-SVTpolicyRule.
.EXAMPLE
    PS C:\> New-SVTpolicy Gold
 
    Creates a new blank backup policy. To create or replace rules for the new backup policy,
    use New-SVTpolicyRule.
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function New-SVTpolicy {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$PolicyName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }

    $Uri = $global:SVTconnection.OVC + '/api/policies/'
    $Body = @{ 'name' = $PolicyName } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask # Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Create a new backup policy rule in a HPE SimpliVity backup policy
.DESCRIPTION
    Create backup policies within an existing HPE Simplivity backup policy. Optionally,
    You can replace all the existing policy rules with the new policy rule.
.PARAMETER PolicyName
    The backup policy to add/replace backup policy rules
.PARAMETER WeekDay
    Specifies the Weekday(s) to run backup, e.g. "Mon", "Mon,Tue" or "Mon,Wed,Fri"
.PARAMETER MonthDay
    Specifies the day(s) of the month to run backup, e.g. 1 or 1,11,21
.PARAMETER LastDay
    Specifies the last day of the month to run a backup
.PARAMETER All
    Specifies every day to run backup
.PARAMETER DestinationName
    Specifies the destination HPE SimpliVity cluster name or external store name. If not specified, the
    destination will be the local cluster. If an external store has the same name as a cluster, the cluster
    wins.
.PARAMETER StartTime
    Specifies the start time (24 hour clock) to run backup, e.g. 22:00
.PARAMETER EndTime
    Specifies the start time (24 hour clock) to run backup, e.g. 00:00
.PARAMETER FrequencyMin
    Specifies the frequency, in minutes (how many times a day to run).
    Must be between 1 and 1440 minutes (24 hours).
.PARAMETER RetentionDay
    Specifies the retention, in days.
.PARAMETER ConsistencyType
    Available options are:
    1. NONE - This is the default and creates a crash consistent backup
    2. DEFAULT - Create application consistent backups using VMware Snapshot
    3. VSS - Create application consistent backups using Microsoft VSS in the guest operating system. Refer
    to the admin guide for requirements and supported applications
 
.PARAMETER ReplaceRules
    If this switch is specified, ALL existing rules in the specified backup policy are removed and
    replaced with this new rule.
.EXAMPLE
    PS C:\>New-SVTpolicyRule -PolicyName Silver -All -ClusterName ProductionCluster -ReplaceRules
 
    Replaces all existing backup policy rules with a new rule, backup every day to the specified cluster,
    using the default start time (00:00), end time (00:00), Frequency (1440, or once per day), retention of
    1 day and no application consistency.
.EXAMPLE
    PS C:\>New-SVTpolicyRule -PolicyName Bronze -Last -ExternalStoreName StoreOnce-Data02 -RetentionDay 365
 
    Backup VMs on the last day of the month, storing them on the specified external datastore and retaining the
    backup for one year.
     
    PS C:\>New-SVTpolicyRule -PolicyName Silver -Weekday Mon,Wed,Fri -ClusterName Cluster01 -RetentionDay 7
 
    Adds a new rule to the specified policy to run backups on the specified weekdays and retain backup for a week.
.EXAMPLE
    PS C:\>New-SVTpolicyRule -PolicyName Silver -Last -ClusterName Prod `
        -RetentionDay 30 -ConsistencyType VSS
 
    Adds a new rule to the specified policy to run an application consistent backup on the last day
    of each month, retaining it for 1 month.
.INPUTS
    System.String
.OUTPUTS
    HPE.SipmliVity.Task
.NOTES
#>
function New-SVTpolicyRule {
    [CmdletBinding(DefaultParameterSetName = 'ByWeekDay')]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$PolicyName,

        [Parameter(Mandatory = $true, Position = 1, ParameterSetName = 'ByAllDay')]
        [switch]$All,

        [Parameter(Mandatory = $true, Position = 1, ParameterSetName = 'ByWeekDay')]
        [array]$WeekDay,

        [Parameter(Mandatory = $true, Position = 1, ParameterSetName = 'ByMonthDay')]
        [array]$MonthDay,

        [Parameter(Mandatory = $true, Position = 1, ParameterSetName = 'ByLastDay')]
        [switch]$LastDay,

        [Parameter(Mandatory = $false, Position = 2)]
        [System.String]$DestinationName,

        [Parameter(Mandatory = $false, Position = 3)]
        [System.String]$StartTime = '00:00',

        [Parameter(Mandatory = $false, Position = 4)]
        [System.String]$EndTime = '00:00',

        [Parameter(Mandatory = $false, Position = 5)]
        [ValidateRange(1, 1440)]
        [System.String]$FrequencyMin = 1440, # Default is once per day

        [Parameter(Mandatory = $false, Position = 6)]
        [System.Int32]$RetentionDay = 1,

        [Parameter(Mandatory = $false, Position = 7)]
        [ValidateSet('NONE', 'DEFAULT', 'VSS')]  #'FAILEDVSS', 'NOT_APPLICABLE'
        [System.String]$ConsistencyType = 'NONE',

        [Parameter(Mandatory = $false, Position = 8)]
        [switch]$ReplaceRules
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }

    try {
        $PolicyId = Get-SVTpolicy -PolicyName $PolicyName -ErrorAction Stop | 
        Select-Object -ExpandProperty PolicyId -Unique

        $Uri = $global:SVTconnection.OVC + '/api/policies/' + $PolicyId + '/rules'
        
        if ($PSBoundParameters.ContainsKey('ReplaceRules')) {
            $Uri += "?replace_all_rules=$true"
        }
        else {
            $Uri += "?replace_all_rules=$false"
        }
    }
    catch {
        throw $_.Exception.Message
    }

    if ($PSBoundParameters.ContainsKey('DestinationName')) {
        try {
            $Destination = Get-SVTbackupDestination -Name $DestinationName -ErrorAction Stop

            if ($Destination.Type -eq 'Cluster') {
                $Body = @{ 'destination_id' = $Destination.Id }
            }
            else {
                $Body = @{ 'external_store_name' = $Destination.Id }
            }
        }
        catch {
            throw $_.Exception.Message
        }
    }
    else {
        # No destination specified, so the default destination is local cluster (<local>)
        $Body = @{ 'destination_id' = '' }
    }

    if ($PSBoundParameters.ContainsKey('WeekDay')) {
        foreach ($day in $WeekDay) {
            if ($day -notmatch '^(Mon|Tue|Wed|Thu|Fri|Sat|Sun)$') {
                throw 'Invalid day entered, you must enter weekday in the form "Mon", "Mon,Fri" or "Mon,Thu,Sat"'
            }
        }
        $TargetDay = $WeekDay -join ','
    }
    elseif ($PSBoundParameters.ContainsKey('MonthDay')) {
        foreach ($day in $MonthDay) {
            if ($day -notmatch '^([1-9]|[12]\d|3[01])$') {
                throw 'Invalid day entered, you must enter month day(s) in the form "1", "1,15" or "1,12,24"'
            }
        }
        $TargetDay = $MonthDay -join ','
    }
    elseif ($PSBoundParameters.ContainsKey('LastDay')) {
        $TargetDay = 'last'
    }
    else {
        $TargetDay = 'all'
    }

    if ($StartTime -notmatch '^[0-2][0-9]:[0-5][0-9]$') {
        throw "Start time invalid. It must be in the form 00:00 (24 hour time). e.g. -StartTime 06:00"
    }
    if ($EndTime -notmatch '^[0-2][0-9]:[0-5][0-9]$') {
        throw "End time invalid. It must be in the form 00:00 (24 hour time). e.g. -EndTime 23:30"
    }

    # The new HTML5 client doesn't expose application consistent tick box - application_consistent must be
    # true if consitency_type is VSS or DEFAULT. Otherwise the API sets it to NONE.
    $ConsistencyType = $ConsistencyType.ToUpper()
    if ($ConsistencyType -eq 'NONE') {
        $ApplicationConsistent = $false
    }
    else {
        $ApplicationConsistent = $true
    }

    $Body += @{
        'frequency'              = $FrequencyMin
        'retention'              = $RetentionDay * 1440  # Retention is in minutes
        'days'                   = $TargetDay
        'start_time'             = $StartTime
        'end_time'               = $EndTime
        'application_consistent' = $ApplicationConsistent
        'consistency_type'       = $ConsistencyType
    } 

    $Body = '[' + $($Body | ConvertTo-Json) + ']'
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Updates an existing HPE SimpliVity backup policy rule
.DESCRIPTION
    Updates an existing HPE SimpliVity backup policy rule. You must specify at least:
 
    - the name of policy to update
    - the existing policy rule number
    - the required day (via -All, -Weekday, -Monthday or -Lastday), even if you're not changing the day
 
    All other parameters are optional, if not set the new policy rule will inherit the current policy rule settings.
 
    Note: A backup destination cannot be changed in a rule. You must first delete the rule and then recreate it
    using Remove-SVTpolicyRule and New-SVTpolicyRule respectively, to update the backup destination.
 
    Rule numbers start from 0 and increment by 1. Use Get-SVTpolicy to identify the rule you want to update.
.PARAMETER PolicyName
    The name of the backup policy to update
.PARAMETER RuleNumber
    The number of the policy rule to update. Use Get-SVTpolicy to show policy information
.PARAMETER WeekDay
    Specify the Weekday(s) to run the backup, e.g. Mon, Mon,Tue or Mon,Wed,Fri
.PARAMETER MonthDay
    Specify the day(s) of the month to run the backup, e.g. 1, 1,16 or 2,4,6,8,10,12,14,16,18,20,22,24,26,28
.PARAMETER LastDay
    Specifies the last day of the month to run the backup
.PARAMETER All
    Specifies every day to run the backup
.PARAMETER StartTime
    Specifies the start time (24 hour clock) to run backup, e.g. 22:00
    If not set, the existing policy rule setting is used
.PARAMETER EndTime
    Specifies the start time (24 hour clock) to run backup, e.g. 00:00
    If not set, the existing policy rule setting is used
.PARAMETER FrequencyMin
    Specifies the frequency, in minutes (how many times a day to run).
    Must be between 1 and 1440 minutes (24 hours).
    If not set, the existing policy rule setting is used
.PARAMETER RetentionDay
    Specifies the backup retention, in days.
    If not set, the existing policy rule setting is used
.PARAMETER ConsistencyType
    Available options are:
    1. NONE - This is the default and creates a crash consistent backup
    2. DEFAULT - Create application consistent backups using VMware Snapshot
    3. VSS - Create application consistent backups using Microsoft VSS in the guest operating system. Refer
    to the admin guide for requirements and supported applications
 
    If not set, the existing policy rule setting is used
.EXAMPLE
    PS C:\>Update-SVTPolicyRule -Policy Gold -RuleNumber 2 -Weekday Sun,Fri -StartTime 20:00 -EndTime 23:00
 
    Updates rule number 2 in the specified policy with a new weekday policy. start and finish times. This command
    inherits the existing retention, frequency, and application consistency settings from the existing rule.
.EXAMPLE
    PS C:\>Update-SVTPolicyRule -Policy Bronze -RuleNumber 1 -Last
    PS C:\>Update-SVTPolicyRule Bronze 1 -Last
     
    Both commands update rule 1 in the specified policy with a new day. All other settings are inherited from
    the existing backup policy rule.
.EXAMPLE
    PS C:\>Update-SVTPolicyRule Silver 3 -MonthDay 1,7,14,21
 
    Updates the existing rule 3 in the specified policy to perform backups four times a month on the specified days.
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
- Changing the destination is unsupported.
- Changing ConsistencyType to anything other than None or Default doesn't appear to work.
Use Remove-SVTpolicyRule and New-SVTpolicyRule to update ConsistencyType to VSS.
#>
function Update-SVTpolicyRule {
    [CmdletBinding(DefaultParameterSetName = 'ByWeekDay')]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$PolicyName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$RuleNumber,

        [Parameter(Mandatory = $true, Position = 2, ParameterSetName = 'ByAllDay')]
        [switch]$All,

        [Parameter(Mandatory = $true, Position = 2, ParameterSetName = 'ByWeekDay')]
        [array]$WeekDay,

        [Parameter(Mandatory = $true, Position = 2, ParameterSetName = 'ByMonthDay')]
        [array]$MonthDay,

        [Parameter(Mandatory = $true, Position = 2, ParameterSetName = 'ByLastDay')]
        [switch]$LastDay,

        [Parameter(Mandatory = $false, Position = 3)]
        [System.String]$StartTime,

        [Parameter(Mandatory = $false, Position = 4)]
        [System.String]$EndTime,

        [Parameter(Mandatory = $false, Position = 5)]
        [ValidateRange(1, 1440)]
        [System.String]$FrequencyMin,

        [Parameter(Mandatory = $false, Position = 6)]
        [System.Int32]$RetentionDay, 

        [Parameter(Mandatory = $false, Position = 7)]
        [ValidateSet('NONE', 'DEFAULT', 'VSS', 'FAILEDVSS', 'NOT_APPLICABLE')]
        [System.String]$ConsistencyType
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }
    try {
        $Policy = Get-SVTpolicy -PolicyName $PolicyName -RuleNumber $RuleNumber -ErrorAction Stop 
        $PolicyId = $Policy | Select-Object -ExpandProperty PolicyId
        $RuleId = $Policy | Select-Object -ExpandProperty RuleId
        
        $Uri = $global:SVTconnection.OVC + '/api/policies/' + $PolicyId + '/rules/' + $RuleId
    }
    catch {
        throw $_.Exception.Message
    }

    # Determine the value for 'Day' property.
    if ($PSBoundParameters.ContainsKey('WeekDay')) {
        foreach ($day in $WeekDay) {
            if ($day -notmatch '^(Mon|Tue|Wed|Thu|Fri|Sat|Sun)$') {
                throw 'Invalid day entered, you must enter weekday in the form "Mon", "Mon,Fri" or "Mon,Thu,Sat"'
            }
        }
        $TargetDay = $WeekDay -join ','
    }
    elseif ($PSBoundParameters.ContainsKey('MonthDay')) {
        foreach ($day in $MonthDay) {
            if ($day -notmatch '^([1-9]|[12]\d|3[01])$') {
                throw 'Invalid day entered, you must enter month day(s) in the form "1", "1,15" or "1,12,24"'
            }
        }
        $TargetDay = $MonthDay -join ','
    }
    elseif ($PSBoundParameters.ContainsKey('LastDay')) {
        $TargetDay = 'last'
    }
    else {
        $TargetDay = 'all'
    }

    if ($PSBoundParameters.ContainsKey('StartTime')) {
        if ($StartTime -notmatch '^[0-2][0-9]:[0-5][0-9]$') {
            throw "Start time invalid. It must be in the form 00:00 (24 hour time). e.g. -StartTime 06:00"
        }
    }
    else {
        $StartTime = $Policy | Select-Object -ExpandProperty StartTime
        Write-Verbose "Inheriting existing start time $StartTime"
    }

    if ($PSBoundParameters.ContainsKey('EndTime')) {
        if ($EndTime -notmatch '^[0-2][0-9]:[0-5][0-9]$') {
            throw "End time invalid. It must be in the form 00:00 (24 hour time). e.g. -EndTime 23:30"
        }
    }
    else {
        $EndTime = $Policy | Select-Object -ExpandProperty EndTime
        Write-Verbose "Inheriting existing end time $EndTime"
    }

    if ( -not $PSBoundParameters.ContainsKey('FrequencyMin')) {
        $FrequencyMin = ($Policy | Select-Object -ExpandProperty FrequencyHour) * 60
        Write-Verbose "Inheriting existing backup frequency of $FrequencyMin minutes"
    }

    if ( -not $PSBoundParameters.ContainsKey('RetentionDay')) {
        $RetentionDay = $Policy | Select-Object -ExpandProperty RetentionDay
        Write-Verbose "Inheriting existing retention of $RetentionDay days"
    }

    if ( -not $PSBoundParameters.ContainsKey('ConsistencyType')) {
        $ConsistencyType = ($Policy | Select-Object -ExpandProperty ConsistencyType).ToUpper()
        Write-Verbose "Inheriting existing consistency type $ConsistencyType"
    }

    # The new HTML5 client doesn't expose application consistent tick box - application_consistent must be
    # true if consitency_type is VSS or DEFAULT. Otherwise the API sets it to NONE.
    $ConsistencyType = $ConsistencyType.ToUpper()
    if ($ConsistencyType -eq 'NONE') {
        $ApplicationConsistent = $false
    }
    else {
        $ApplicationConsistent = $true
    }

    $Body = @{
        'frequency'              = $FrequencyMin
        'retention'              = $RetentionDay * 1440  # Retention is in minutes
        'days'                   = $TargetDay
        'start_time'             = $StartTime
        'end_time'               = $EndTime
        'application_consistent' = $ApplicationConsistent
        'consistency_type'       = $ConsistencyType
    }

    $Body = $Body | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Put -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Deletes a backup rule from an existing HPE SimpliVity backup policy
.DESCRIPTION
    Delete an existing rule from a HPE SimpliVity backup policy. You must specify the policy name and
    the rule number to be removed.
 
    Rule numbers start from 0 and increment by 1. Use Get-SVTpolicy to identify the rule you want to delete
.PARAMETER PolicyName
    Specify the policy containing the policy rule to delete
.PARAMETER RuleNumber
    Specify the number assigned to the policy rule to delete. Use Get-SVTpolicy to show policy information
.EXAMPLE
    PS C:\>Remove-SVTPolicyRule -Policy Gold -RuleNumber 2
 
    Removes rule number 2 in the specified backup policy
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
    There seems to be a bug, you cannot remove rule 0 if there are other rules. You can use New-SVTpolicyRule
    with the -ReplaceRules parameter to remove all rules,
    or remove the other rules first.
#>
function Remove-SVTpolicyRule {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$PolicyName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$RuleNumber
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }
    
    try {
        $Policy = Get-SVTpolicy -PolicyName $PolicyName -RuleNumber $RuleNumber -ErrorAction Stop
        
        $PolicyId = $Policy | Select-Object -ExpandProperty PolicyId -Unique
        $RuleId = $Policy | Select-Object -ExpandProperty RuleId -Unique
        $Uri = $global:SVTconnection.OVC + '/api/policies/' + $PolicyId + '/rules/' + $RuleId
    }
    catch {
        throw $_.Exception.Message
    }

    if (-not ($PolicyId)) {
        throw 'Specified policy name or Rule number not found. Use Get-SVTpolicy to determine rule number for the rule you want to delete'
    }

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Delete -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Rename a HPE SimpliVity backup policy
.DESCRIPTION
    Rename a HPE SimpliVity backup policy
.PARAMETER PolicyName
    The existing backup policy name
.PARAMETER NewPolicyName
    The new name for the backup policy
.EXAMPLE
    PS C:\>Get-SVTpolicy
    PS C:\>Rename-SVTpolicy -PolicyName Silver -NewPolicyName Gold
 
    The first command confirms the new policy name doesn't exist.
    The second command renames the backup policy as specified.
.EXAMPLE
    PS C:\>Rename-SVTpolicy Silver Gold
 
    Renames the backup policy as specified
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Rename-SVTpolicy {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$PolicyName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$NewPolicyName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }

    try {
        $PolicyId = Get-SVTpolicy -PolicyName $PolicyName -ErrorAction Stop | 
        Select-Object -ExpandProperty PolicyId -Unique

        $Uri = $global:SVTconnection.OVC + '/api/policies/' + $PolicyId + '/rename'

        $Body = @{ 'name' = $NewPolicyName } | ConvertTo-Json
        Write-Verbose $Body
    }
    catch {
        throw $_.Exception.Message
    }

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Removes a HPE SimpliVity backup policy
.DESCRIPTION
    Removes a HPE SimpliVity backup policy, providing it is not in use be any datastores or virtual machines.
.PARAMETER PolicyName
    The policy to delete
.EXAMPLE
    PS C:\> Get-SVTvm | Select VmName, PolicyName
    PS C:\> Get-SVTdatastore | Select DatastoreName, PolicyName
    PS C:\> Remove-SVTpolicy -PolicyName Silver
 
    Confirm there are no datastores or VMs using the backup policy and then delete it.
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Remove-SVTpolicy {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$PolicyName
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    try {
        $PolicyId = Get-SVTpolicy -PolicyName $PolicyName -ErrorAction Stop | Select-Object -ExpandProperty PolicyId -Unique
    }
    catch {
        throw $_.Exception.Message
    }

    # Confirm the policy is not in use before deleting it. To do this, check both datastores and VMs
    $UriList = @(
        $global:SVTconnection.OVC + '/api/policies/' + $PolicyId + '/virtual_machines'
        $global:SVTconnection.OVC + '/api/policies/' + $PolicyId + '/datastores'
    )
    [Bool]$ObjectFound = $false
    [String]$Message = ''
    Foreach ($Uri in $UriList) {
        try {
            $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
        }
        catch {
            throw $_.Exception.Message
        }
        
        if ($Task.datastores) {
            $Message += "There are $(($Task.datastores).Count) databases using backup policy $PolicyName. "
            $ObjectFound = $true
        }
        if ($Task.virtual_machines) {
            $Message += "There are $(($Task.virtual_machines).Count) virtual machines using backup " +
            "policy $PolicyName. "
            $ObjectFound = $true
        }
    }
    if ($ObjectFound) {
        throw "$($Message)Cannot remove a backup policy that is still in use"
    }

    try {
        $Uri = $global:SVTconnection.OVC + '/api/policies/' + $PolicyId
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Delete -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Suspends the HPE SimpliVity backup policy for a host, a cluster or the federation
.DESCRIPTION
    Suspend the HPE SimpliVity backup policy for a host, a cluster or the federation
.PARAMETER ClusterName
    Apply to specified Cluster name
.PARAMETER HostName
    Apply to specified host name
.PARAMETER Federation
    Apply to federation
.EXAMPLE
    PS C:\>Suspend-SVTpolicy -Federation
 
    Suspends backup policies for the federation
.EXAMPLE
    PS C:\>Suspend-SVTpolicy -ClusterName Prod
 
    Suspend backup policies for the specified cluster
.EXAMPLE
    PS C:\>Suspend-SVTpolicy -HostName host01
 
    Suspend backup policies for the specified host
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Suspend-SVTpolicy {
    [CmdletBinding(DefaultParameterSetName = 'ByHost')]
    param (
        [Parameter(Mandatory = $true, Position = 0, ParameterSetName = 'ByHost')]
        [System.String]$HostName,

        [Parameter(Mandatory = $true, ParameterSetName = 'ByCluster')]
        [System.String]$ClusterName,

        [Parameter(Mandatory = $true, ParameterSetName = 'ByFederation')]
        [switch]$Federation
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }
    $Uri = $global:SVTconnection.OVC + '/api/policies/suspend'

    if ($PSBoundParameters.ContainsKey('ClusterName')) {
        try {
            $TargetId = Get-SVTcluster -ClusterName $ClusterName -ErrorAction Stop | 
            Select-Object -ExpandProperty ClusterId

            $TargetType = 'omnistack_cluster'
        }
        catch {
            throw $_.Exception.Message
        }
    }
    elseif ($PSBoundParameters.ContainsKey('HostName')) {
        try {
            $TargetId = Get-SVThost -HostName $HostName -ErrorAction Stop | 
            Select-Object -ExpandProperty HostId
            
            $TargetType = 'host'
        }
        catch {
            throw $_.Exception.Message
        }
    }
    else {
        $TargetId = ''
        $TargetType = 'federation'
    }

    $Body = @{
        'target_object_type' = $TargetType
        'target_object_id'   = $TargetId
    } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Resumes the HPE SimpliVity backup policy for a host, a cluster or the federation
.DESCRIPTION
    Resumes the HPE SimpliVity backup policy for a host, a cluster or the federation
.PARAMETER ClusterName
    Apply to specified cluster name
.PARAMETER HostName
    Apply to specified host name
.PARAMETER Federation
    Apply to federation
.EXAMPLE
    PS C:\>Resume-SVTpolicy -Federation
 
    Resumes backup policies for the federation
.EXAMPLE
    PS C:\>Resume-SVTpolicy -ClusterName Prod
 
    Resumes backup policies for the specified cluster
.EXAMPLE
    PS C:\>Resume-SVTpolicy -HostName host01
 
    Resumes backup policies for the specified host
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Resume-SVTpolicy {
    [CmdletBinding(DefaultParameterSetName = 'ByHost')]
    param (
        [Parameter(Mandatory = $true, Position = 0, ParameterSetName = 'ByHost')]
        [System.String]$HostName,

        [Parameter(Mandatory = $true, ParameterSetName = 'ByCluster')]
        [System.String]$ClusterName,

        [Parameter(Mandatory = $true, ParameterSetName = 'ByFederation')]
        [switch]$Federation
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }

    $Uri = $global:SVTconnection.OVC + '/api/policies/resume'

    if ($PSBoundParameters.ContainsKey('ClusterName')) {
        try {
            $TargetId = Get-SVTcluster -ClusterName $ClusterName -ErrorAction Stop | 
            Select-Object -ExpandProperty ClusterId

            $TargetType = 'omnistack_cluster'
        }
        catch {
            throw $_.Exception.Message
        }
    }
    elseif ($PSBoundParameters.ContainsKey('HostName')) {
        try {
            $TargetId = Get-SVThost -HostName $HostName -ErrorAction Stop | 
            Select-Object -ExpandProperty HostId

            $TargetType = 'host'
        }
        catch {
            throw $_.Exception.Message
        }
    }
    else {
        $TargetId = ''
        $TargetType = 'federation'
    }

    $Body = @{
        'target_object_type' = $TargetType
        'target_object_id'   = $TargetId
    } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Display a report showing information about HPE SimpliVity backup rates and limits
.DESCRIPTION
    Display a report showing information about HPE SimpliVity backup rates and limits
.EXAMPLE
    PS C:\>Get-SVTpolicyScheduleReport
 
.INPUTS
    None
.OUTPUTS
    PSCustomObject
.NOTES
#>
function Get-SVTpolicyScheduleReport {
    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }

    $Uri = $global:SVTconnection.OVC + '/api/policies/policy_schedule_report'

    try {
        $Response = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    $Response | ForEach-Object {
        [PSCustomObject]@{
            DailyBackupRate               = $_.daily_backup_rate
            BackupRateLevel               = $_.backup_rate_level
            DailyBackupRateLimit          = $_.daily_backup_rate_limit
            ProjectedRetainedBackups      = $_.projected_retained_backups
            ProjectedRetainedBackupsLevel = $_.projected_retained_backups_level
            RetainedBackupsLimit          = $_.retained_backups_limit
        }
    }
}

#endregion Policy

#region VirtualMachine

<#
.SYNOPSIS
    Display information about VMs running on HPE SimpliVity storage
.DESCRIPTION
    Display information about virtual machines running in the HPE SimpliVity Federation. Accepts
    parameters to limit the objects returned. Also accepts output from Get-SVThost as input.
 
    Verbose is automatically turned on to show more information about what this command is doing.
.PARAMETER VmName
    Display information for the specified virtual machine
.PARAMETER VmId
    Display information for the specified virtual machine ID
.PARAMETER DatastoreName
    Display information for virtual machines on the specified datastore
.PARAMETER ClusterName
    Display information for virtual machines on the specified cluster
.PARAMETER PolicyName
    Display information for virtual machines that have the specified backup policy assigned
.PARAMETER HostName
    Display information for virtual machines on the specified host
.PARAMETER State
    Display information for virtual machines with the specified state
.PARAMETER Limit
    The maximum number of virtual machines to display
.EXAMPLE
    PS C:\> Get-SVTvm
 
    Shows all virtual machines in the Federation with state "ALIVE", which is the default state
.EXAMPLE
    PS C:\> Get-SVTvm -VmName Server2016-01
    PS C:\> Get-SVTvm -Name Server2016-01
    PS C:\> Get-SVTvm Server2016-01
 
    All three commands perform the same action - show information about the specified virtual machine(s) with
    state "ALIVE", which is the default state
 
    The first command uses the paramater name; the second uses an alias for VmName; the third uses positional
    parameter, which accepts a VM name.
.EXAMPLE
    PS C:\> Get-SVTvm -State DELETED
    PS C:\> Get-SVTvm -State ALIVE,REMOVED,DELETED
 
    Shows all virtual machines in the Federation with the specified state(s)
.EXAMPLE
    PS C:\> Get-SVTvm -DatastoreName DS01,DS02
 
    Shows all virtual machines residing on the specified datastore(s)
.EXAMPLE
    PS C:\> Get-SVTvm VM1,VM2,VM3 | Out-GridView -Passthru | Export-CSV FilteredVmList.CSV
 
    Exports the specified VM information to Out-GridView to allow filtering and then exports
    this to a CSV
.EXAMPLE
    PS C:\> Get-SVTvm -HostName esx04 | Select-Object Name, SizeGB, Policy, HAstatus
 
    Show the VMs from the specified host. Show the selected properties only.
.INPUTS
    System.String
.OUTPUTS
    HPE.SimpliVity.VirtualMachine
.NOTES
Known issues:
OMNI-69918 - GET calls for virtual machine objects may result in OutOfMemortError when exceeding 8000 objects
#>
function Get-SVTvm {
    [CmdletBinding(DefaultParameterSetName = 'ByVmName')]
    param (
        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'ByVmName')]
        [Alias("Name")]
        [System.String[]]$VmName,

        [Parameter(Mandatory = $false, ParameterSetName = 'ById')]
        [Alias("Id")]
        [System.String[]]$VmId,

        [Parameter(Mandatory = $false, ParameterSetName = 'ByDatastoreName')]
        [System.String[]]$DatastoreName,

        [Parameter(Mandatory = $false, ParameterSetName = 'ByClusterName')]
        [System.String[]]$ClusterName,

        [Parameter(Mandatory = $false, ParameterSetName = 'ByPolicyName')]
        [System.String]$PolicyName,

        [Parameter(Mandatory = $false, ParameterSetName = 'ByHostName')]
        [System.String]$HostName, # API only accepts one host id

        [Parameter(Mandatory = $false)]
        [ValidateSet("ALIVE", "DELETED", "REMOVED")]
        [System.String[]]$State = "ALIVE",

        [Parameter(Mandatory = $false)]
        [ValidateRange(1, 5000)]   # Limited to avoid out of memory errors (OMNI-69918) (Runtime error over 5000)
        [System.Int32]$Limit = 500
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
    }
    
    $LocalFormat = Get-SVTLocalDateFormat
    $Uri = "$($global:SVTconnection.OVC)/api/virtual_machines" +
    '?show_optional_fields=true' +
    '&case=insensitive' +
    '&offset=0' +
    "&limit=$Limit" +
    "&state=$($State -join ',')"

    # Get hosts so we can convert HostId to the more useful HostName in the virtual machine object
    $Allhost = Get-SVThost

    if ($PSBoundParameters.ContainsKey('VmName')) {
        $VmName = $VmName -join ','
        $Uri += "&name=$VmName"
    }

    if ($PSBoundParameters.ContainsKey('VmId')) {
        $VmId = $VmId -join ','
        $Uri += "&id=$VmId"
    }

    if ($PSBoundParameters.ContainsKey('PolicyName')) {
        $PolicyName = $PolicyName -join ','
        $Uri += "&policy_name=$PolicyName"
    }
    
    if ($PSBoundParameters.ContainsKey('HostName')) {
        try {
            $HostName = Resolve-SVTFullHostName $HostName $Allhost.HostName
        }
        catch {
            throw $_.Exception.Message
        }
        $HostId = $Allhost | Where-Object HostName -eq $HostName | Select-Object -ExpandProperty HostId
        $Uri += "&host_id=$HostId"
    }

    if ($PSBoundParameters.ContainsKey('ClusterName')) {
        $ClusterName = $ClusterName -join ','
        $Uri += "&omnistack_cluster_name=$ClusterName"
    }

    if ($PSBoundParameters.ContainsKey('DataStoreName')) {
        $DatastoreName = $DatastoreName -join ','
        $Uri += "&datastore_name=$DataStoreName"
    }

    try {
        $Response = Invoke-SVTrestMethod -Uri "$Uri" -Header $Header -Method Get -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }

    $VmCount = $Response.count
    if ($VmCount -gt $Limit) {
        Write-Warning "There are $VmCount matching virtual machines, but limited to displaying only $Limit. Either increase -Limit or use more restrictive parameters"
    }
    else {
        Write-Verbose "There are $VmCount matching virtual machines"
    }

    if ($PSBoundParameters.ContainsKey('VmName') -and -not $response.virtual_machines.name) {
        throw "Specified virtual machine(s) $VmName not found"
    }

    if ($PSBoundParameters.ContainsKey('VmId') -and -not $response.virtual_machines.name) {
        throw "Specified virtual machine ID(s) $VmId not found"
    }

    $Response.virtual_machines | ForEach-Object {
        if ($_.created_at -as [datetime]) {
            $CreateDate = Get-Date -Date $_.created_at -Format $LocalFormat
        }
        else {
            $CreateDate = $null
        }
        if ($_.deleted_at -as [DateTime]) {
            $DeletedDate = Get-Date -Date $_.deleted_at -format $LocalFormat
        }
        else {
            $DeletedDate = $null
        }

        $ThisHost = $Allhost | Where-Object HostID -eq $_.host_id | Select-Object -ExpandProperty HostName

        [PSCustomObject]@{
            PSTypeName               = 'HPE.SimpliVity.VirtualMachine'
            PolicyId                 = $_.policy_id
            CreateDate               = $CreateDate
            PolicyName               = $_.policy_name
            DataStoreName            = $_.datastore_name
            ClusterName              = $_.omnistack_cluster_name
            DeletedDate              = $DeletedDate
            AppAwareVmStatus         = $_.app_aware_vm_status
            HostName                 = $ThisHost
            HostId                   = $_.host_id
            HypervisorId             = $_.hypervisor_object_id
            VmName                   = $_.name
            DatastoreId              = $_.datastore_id
            ReplicaSet               = $_.replica_set
            DataCenterId             = $_.compute_cluster_parent_hypervisor_object_id
            DataCenterName           = $_.compute_cluster_parent_name
            HypervisorType           = $_.hypervisor_type
            VmId                     = $_.id
            State                    = $_.state
            ClusterId                = $_.omnistack_cluster_id
            HypervisorManagementIP   = $_.hypervisor_management_system
            HypervisorManagementName = $_.hypervisor_management_system_name
            HAstatus                 = $_.ha_status
            HAresyncProgress         = $_.ha_resynchronization_progress
            HypervisorVmPowerState   = $_.hypervisor_virtual_machine_power_state
        }
    } # foreach VM
}

<#
.SYNOPSIS
    Display the primary and secondary replica locations for HPE SimpliVity virtual machines
.DESCRIPTION
    Display the primary and secondary replica locations for HPE SimpliVity virtual machines
.PARAMETER VmName
    Display information for the specified virtual machine
.PARAMETER DatastoreName
    Display information for virtual machines on the specified datastore
.PARAMETER ClusterName
    Display information for virtual machines on the specified cluster
.PARAMETER HostName
    Display information for virtual machines on the specified host
.EXAMPLE
    PS C:\>Get-SVTvmReplicaSet
 
    Displays the primary and secondary locations for all virtual machine replica sets.
.INPUTS
    system.string
.OUTPUTS
    PSCustomObject
.NOTES
#>
function Get-SVTvmReplicaSet {
    [CmdletBinding(DefaultParameterSetName = 'ByVm')]
    param (
        [Parameter(Mandatory = $false, Position = 0, ParameterSetName = 'ByVm')]
        [Alias("Name")]
        [System.String[]]$VmName,

        [Parameter(Mandatory = $true, ParameterSetName = 'ByDatastore')]
        [System.String[]]$DataStoreName,

        [Parameter(Mandatory = $true, ParameterSetName = 'ByCluster')]
        [System.String[]]$ClusterName,

        [Parameter(Mandatory = $true, ParameterSetName = 'ByHost')]
        [System.String]$HostName
    )

    begin {
        $Allhost = Get-SVThost

        if ($PSBoundParameters.ContainsKey('VmName')) {
            $VmObj = Get-SVTvm -VmName $VmName
        }
        elseif ($PSBoundParameters.ContainsKey('DataStoreName')) {
            $VmObj = Get-SVTvm -DataStoreName $DataStoreName
        }
        elseif ($PSBoundParameters.ContainsKey('ClusterName')) {
            $VmObj = Get-SVTvm -ClusterName $ClusterName
        }
        elseif ($PSBoundParameters.ContainsKey('HostName')) {
            $VmObj = Get-SVTvm -HostName $HostName
        }
        else {
            $VmObj = Get-SVTvm  # default is all VMs
        }
    }

    process {
        foreach ($VM in $VmObj) {
            $PrimaryId = $VM.ReplicaSet | Where-Object role -eq 'PRIMARY' | 
            Select-Object -ExpandProperty id

            $SecondaryId = $VM.ReplicaSet | Where-Object role -eq 'SECONDARY' | 
            Select-Object -ExpandProperty id

            $PrimaryHost = $Allhost | Where-Object HostId -eq $PrimaryId | 
            Select-Object -ExpandProperty HostName

            $SecondaryHost = $Allhost | Where-Object HostId -eq $SecondaryId | 
            Select-Object -ExpandProperty HostName
            
            [PSCustomObject]@{
                PSTypeName  = 'HPE.SimpliVity.ReplicaSet'
                VmName      = $VM.VmName
                State       = $VM.State
                HAstatus    = $VM.HAstatus
                ClusterName = $VM.ClusterName
                Primary     = $PrimaryHost
                Secondary   = $SecondaryHost
            }
        }
    }
}


<#
.SYNOPSIS
    Clone a Virtual Machine hosted on SimpliVity storage
.DESCRIPTION
    This cmdlet will clone the specified virtual machine, using the new name provided.
.PARAMETER VmName
    Specify the VM to clone
.PARAMETER CloneName
    Specify the name of the new clone
.PARAMETER ConsistencyType
    Available options are:
    1. NONE - This is the default and creates a crash consistent backup
    2. DEFAULT - Create application consistent backups using VMware Snapshot
    3. VSS - Create application consistent backups using Microsoft VSS in the guest operating system. Refer
    to the admin guide for requirements and supported applications
.EXAMPLE
    PS C:\> New-SVTclone -VmName MyVm1
 
    Create a clone with the default name 'MyVm1-clone-200212102304', where the suffix is a date stamp in
    the form 'yyMMddhhmmss'
.EXAMPLE
    PS C:\> New-SVTclone -VmName Server2016-01 -CloneName Server2016-Clone
    PS C:\> New-SVTclone -VmName Server2016-01 -CloneName Server2016-Clone -ConsistencyType NONE
 
    Both commands do the same thing, they create an application consistent clone of the specified
    virtual machine, using a snapshot
.EXAMPLE
    PS C:\> New-SVTclone -VmName RHEL8-01 -CloneName RHEL8-01-New -ConsistencyType DEFAULT
 
    Create a crash-consistent clone of the specified virtual machine
.EXAMPLE
    PS C:\> New-SVTclone -VmName Server2016-06 -CloneName Server2016-Clone -ConsistencyType VSS
 
    Creates an application consistent clone of the specified Windows VM, using a VSS snapshot. The clone
    will fail for None-Windows virtual machines.
.INPUTS
    System.String
    HPE.SimpliVity.VirtualMachine
.OUTPUTS
    System.Management.Automation.PSCustomObject
.NOTES
#>
function New-SVTclone {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [System.String]$VmName,

        [Parameter(Mandatory = $false, Position = 1)]
        [Alias("Name")]
        [System.String]$CloneName = "$VmName-clone-$(Get-Date -Format 'yyMMddhhmmss')",

        [Parameter(Mandatory = $false, Position = 3)]
        [ValidateSet('DEFAULT', 'VSS', 'NONE')]
        [System.String]$ConsistencyType = 'NONE'
    )

    $Header = @{
        'Authorization' = "Bearer $($global:SVTconnection.Token)"
        'Accept'        = 'application/json'
        'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
    }

    try {
        $VmId = Get-SVTvm -VmName $VmName -ErrorAction Stop | Select-Object -ExpandProperty VmId
        $Uri = $global:SVTconnection.OVC + '/api/virtual_machines/' + $VmId + '/clone'
        Write-Verbose "Creating a clone of $VmName called $CloneName"
    }
    catch {
        throw $_.Exception.Message
    }

    if ($ConsistencyType -eq 'VSS') {
        Write-Verbose 'Consistency type of VSS will only work with Windows virtual machines'
    }

    if ($ConsistencyType -eq 'NONE') {
        $ApplicationConsistent = $false
    }
    else {
        $ApplicationConsistent = $true
    }

    $Body = @{
        'virtual_machine_name' = $CloneName
        'app_consistent'       = $ApplicationConsistent
        'consistency_type'     = $ConsistencyType.ToUpper()
    } | ConvertTo-Json
    Write-Verbose $Body

    try {
        $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
    }
    catch {
        throw $_.Exception.Message
    }
    $Task
    # Useful to keep the task objects in this session, so we can keep track of them with Get-SVTtask
    $global:SVTtask = $Task
    $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
}

<#
.SYNOPSIS
    Move an existing virtual machine from one HPE SimpliVity datastore to another
.DESCRIPTION
    Relocates the specified virtual machine(s) to a different datastore in the federation. The datastore can be
    in the same or a different datacenter. Consider the following when moving a virtual machine:
        1. You must power off the OS guest before moving, otherwise the operation fails
        2. In its new location, make sure the moved VM(s) boots up after the local OVC and shuts down before it
        3. Any pre-move backups (local or remote) stay associated with the VM(s) after it/they moves. You can use these
           backups to restore the moved VM(s).
        4. HPE OmniStack only supports one move operation per VM at a time. You must wait for the task to complete before
           attempting to move the same VM again
        5. If moving VM(s) out of the current cluster, DRS rules (created by the Intelligent Workload Optimizer) will vMotion the moved VM(s)
           to the destination
.PARAMETER VmName
    The name(s) of the virtual machines you'd like to move
.PARAMETER DatastoreName
    The destination datastore
.EXAMPLE
    PS C:\>Move-SVTvm -VmName MyVm -Datastore DR-DS01
 
    Moves the specified VM to the specified datastore
.EXAMPLE
    PS C:\>"VM1", "VM2" | Move-SVTvm -Datastore DS03
 
    Moves the two VMs to the specified datastore
.EXAMPLE
    PS C:\>Get-VM | Where-Object VmName -match "WEB" | Move-SVTvm -Datastore DS03
    PS C:\>Get-SVTtask
 
    Move VM(s) with "Web" in their name to the specified datastore. Use Get-SVTtask to monitor the progress of the move task(s)
.INPUTS
    system.string
    HPE.SimpliVity.VirtualMachine
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Move-SVTvm {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [Alias("Name")]
        [System.String]$VmName,

        [Parameter(Mandatory = $true, Position = 1)]
        [System.String]$DataStoreName
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }

        try {
            $DataStoreId = Get-SVTdatastore -DatastoreName $DatastoreName -ErrorAction Stop | Select-Object -ExpandProperty DatastoreId
        }
        catch {
            throw $_.Exception.Message
        }
    }
    process {
        foreach ($VM in $VmName) {
            try {
                # Getting VM name within the loop. Getting all VMs in the begin block might be a problem
                # with a large number of VMs
                $VmObj = Get-SVTvm -VmName $VM -ErrorAction Stop

                $Uri = $global:SVTconnection.OVC + '/api/virtual_machines/' + $VmObj.VmId + '/move'

                $Body = @{
                    'virtual_machine_name'     = $VmObj.VmName
                    'destination_datastore_id' = $DatastoreId
                } | ConvertTo-Json
                Write-Verbose $Body
            }
            catch {
                throw $_.Exception.Message
            }

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), move failed for VM $VM"
            }
        }
    }
    end {
        # Useful to keep the task objects in this session, so we can keep track of them with Get-SVTtask
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Stop a virtual machine hosted on HPE SimpliVity storage
.DESCRIPTION
    Stop a virtual machine hosted on HPE SimpliVity storage
 
    Stopping VMs with this command is not recommended. The VM will be in a "crash consistent" state.
    This action may lead to data loss or data corruption.
 
    A better option is to use the VMware PowerCLI Stop-VMGuest cmdlet. This shuts down the Guest OS gracefully.
 
    Note: This command requires a specific version in the content-type passed to the REST API.
    Upgrades to SimpliVity may require the version to be adjusted.
.PARAMETER VmName
    The virtual machine name to stop
.EXAMPLE
    PS C:\>Stop-SVTvm -VmName MyVm
 
    Stops the VM. Not recommended for production workloads
.INPUTS
    System.String
    HPE.SimpliVity.VirtualMachine
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Stop-SVTvm {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [Alias("Name")]
        [System.String]$VmName
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.11+json'
        }
    }

    process {
        foreach ($VM in $VmName) {
            try {
                # Getting VM name within the loop. Getting all VMs in the begin block might be a problem with a large number of VMs
                $VmObj = Get-SVTvm -VmName $VM -ErrorAction Stop
                $Uri = $global:SVTconnection.OVC + '/api/virtual_machines/' + $VmObj.VmId + '/power_off'
            }
            catch {
                throw $_.Exception.Message
            }

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), failed to stop VM $VM"
            }
        }
    }
    end {
        # Useful to keep the task objects in this session, so we can keep track of them with Get-SVTtask
        $global:SVTtask = $AllTask
        $null = $SVTtask # Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Start a virtual machine hosted on HPE SimpliVity storage
.DESCRIPTION
    Start a virtual machine hosted on HPE SimpliVity storage
 
    Note: This command requires a specific version in the content-type passed to the REST API.
    Upgrades to SimpliVity may require the version to be adjusted.
.PARAMETER VmName
    The virtual machine name to start
.EXAMPLE
    PS C:\>Start-SVTvm -VmName MyVm
 
    Starts the VM
.EXAMPLE
    PS C:\>Get-SVTvm -ClusterName DR01 | Start-SVTvm -VmName MyVm
 
    Starts the VMs in the specified cluster
.INPUTS
    System.String
    HPE.SimpliVity.VirtualMachine
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Start-SVTvm {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [Alias("Name")]
        [System.String]$VmName
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.11+json'
        }
    }

    process {
        foreach ($VM in $VmName) {
            try {
                # Getting VM name within the loop. Getting all VMs in the begin block might be a problem
                # with a large number of VMs
                $VmObj = Get-SVTvm -VmName $VM -ErrorAction Stop
                $Uri = $global:SVTconnection.OVC + '/api/virtual_machines/' + $VmObj.VmId + '/power_on'
            }
            catch {
                throw $_.Exception.Message
            }

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), failed to start VM $VM"
            }
        }
    }
    end {
        # Useful to keep the task objects in this session, so we can keep track of them with Get-SVTtask
        $global:SVTtask = $AllTask
        $null = $SVTtask #Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

<#
.SYNOPSIS
    Sets a new HPE SimpliVity backup policy on a virtual machine
.DESCRIPTION
    Sets a new HPE SimpliVity backup policy on a virtual machine. When a VM is first created, it inherits the
    backup policy set on the datastore it is first created on. Use this command to explicitly reset the backup
    policy for a given VM.
.PARAMETER VmName
    The VM that will get a new backup policy setting
.PARAMETER PolicyName
    The name of the backup policy to be used
.EXAMPLE
    PS C:\>Get-SVTvm -Datastore DS01 | Set-SVTvmPolicy Silver
 
    Changes the backup policy for all VMs on the specified datastore.
.EXAMPLE
    Set-SVTvmPolicy Silver VM01
 
    Using positional parameters to apply a new backup policy to the VM
.EXAMPLE
    Set-SVTvmPolicy -VmName VM01 -PolicyName Silver
 
    Using named parameters to apply a new backup policy to the VM
.INPUTS
    System.String
    HPE.SimpliVity.VirtualMachine
.OUTPUTS
    HPE.SimpliVity.Task
.NOTES
#>
function Set-SVTvmPolicy {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true, Position = 0)]
        [Alias("Name")]
        [System.String]$PolicyName,

        [Parameter(Mandatory = $true, Position = 1, ValueFromPipeline = $true, 
            ValueFromPipelinebyPropertyName = $true)]
        [System.String]$VmName
    )

    begin {
        $Header = @{
            'Authorization' = "Bearer $($global:SVTconnection.Token)"
            'Accept'        = 'application/json'
            'Content-Type'  = 'application/vnd.simplivity.v1.5+json'
        }

        try {
            $PolicyId = Get-SVTpolicy -PolicyName $PolicyName | Select-Object -ExpandProperty PolicyId -Unique

            $Body = @{ 'policy_id' = $PolicyId } | ConvertTo-Json
            Write-Verbose $Body
        }
        catch {
            throw $_.Exception.Message
        }

    }
    process {
        foreach ($VM in $VmName) {
            try {
                # Getting a specific VM name within the loop here deliberately. Getting all VMs in the
                # begin block might be a problem on systems with a large number of VMs.
                $VmObj = Get-SVTvm -VmName $VM -ErrorAction Stop
                $Uri = $global:SVTconnection.OVC + '/api/virtual_machines/' + $VmObj.VmId + '/set_policy'
            }
            catch {
                throw $_.Exception.Message
            }

            try {
                $Task = Invoke-SVTrestMethod -Uri $Uri -Header $Header -Body $Body -Method Post -ErrorAction Stop
                $Task
                [array]$AllTask += $Task
            }
            catch {
                Write-Warning "$($_.Exception.Message), failed to set backup policy for VM $VM"
            }
        }
    }
    end {
        # Useful to keep the task objects in this session, so we can keep track of them with Get-SVTtask
        $global:SVTtask = $AllTask
        $null = $SVTtask # Stops PSScriptAnalzer complaining about variable assigned but never used
    }
}

#endregion VirtualMachine

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