VMware.VimAutomation.StorageUtility

1.1

StorageUtility.psm1


##############################################################################
#
#.SYNOPSIS
# Get the Vms Disk foot print
#
#.DESCRIPTION
# Disk foot print is calculated below file which makes an VM
# Config files (.vmx, .vmxf, .vmsd, .nvram)
# Log files (.log)
# Disk files (.vmdk)
# Snapshots (delta.vmdk, .vmsn)
# Swapfile (.vswp)
#
# Get-View -VIObject centOs-1
# TypeName: VMware.Vim.VirtualMachineFileInfo

# FtMetadataDirectory Property string FtMetadataDirectory {get;set;}
# LogDirectory Property string LogDirectory {get;set;}
# SnapshotDirectory Property string SnapshotDirectory {get;set;}
# SuspendDirectory Property string SuspendDirectory {get;set;}
# VmPathName Property string VmPathName {get;set;}
#
#.PARAMETER vm
# VM Object returned by Get-VM cmdlet
#
#.EXAMPLE
# $vmSize = Get-VmDisksFootPrint($vm)
#
##############################################################################

function Get-VmDisksFootPrint($vm)
{
   #Initialize variables
   $VmDirs = @()
   $VmSize = 0
   $searchSpec = New-Object VMware.Vim.HostDatastoreBrowserSearchSpec
   $searchSpec.details = New-Object VMware.Vim.FileQueryFlags
   $searchSpec.details.fileSize = $TRUE

   Get-View -VIObject $vm | % {
      #Populate the array with the vm's directories
      $VmDirs += $_.Config.Files.VmPathName.split("/")[0]
      $VmDirs += $_.Config.Files.SnapshotDirectory.split("/")[0]
      $VmDirs += $_.Config.Files.SuspendDirectory.split("/")[0]
      $VmDirs += $_.Config.Files.LogDirectory.split("/")[0]
      #Add directories of the vm's virtual disk files
      foreach ($disk in $_.Layout.Disk) {
         foreach ($diskfile in $disk.diskfile) {
            $VmDirs += $diskfile.split("/")[0]
         }
      }
      #Only take unique array items
      $VmDirs = $VmDirs | Sort | Get-Unique

      foreach ($dir in $VmDirs) {
         $datastoreObj = Get-Datastore ($dir.split("[")[1]).split("]")[0]
         $datastoreBrowser = Get-View (($datastoreObj | get-view).Browser)
         $taskMoRef  = $datastoreBrowser.SearchDatastoreSubFolders_Task($dir,$searchSpec)
         $task = Get-View $taskMoRef

         while($task.Info.State -eq "running" -or $task.Info.State -eq "queued") {$task = Get-View $taskMoRef }
         foreach ($result in $task.Info.Result){
            foreach ($file in $result.File){
               $VmSize += $file.FileSize
            }
         }
      }
   }
   return $VmSize
}

##############################################################################
#
#.SYNOPSIS
# Get the ESX version of the Host
#
#.DESCRIPTION
# Return the ESX product version of the HostObjects supplied in parameter
#
#.PARAMETER EsxHosts
# Host Objects
#
#.EXAMPLE
# $HostObjects = Get-View -ViewType HostSystem
# $Hash = Get-HostVersion -EsxHosts $HostObjects
#
##############################################################################
function Get-HostVersion {
   param([Object]$EsxHosts= "")
   $EsxHostVersion=@{}
   Foreach ($esx in $HostObjects ) {
      $version = $esx.Config.Product.version
      $EsxHostVersion[$esx.Name] = $version
   }
   return $EsxHostVersion
}

##############################################################################
#
#.SYNOPSIS
# Perform preflight check before proceeding with migration
#
#.DESCRIPTION
# Top level function calling respective preflight checks before proceeding
# with migration
#
#.PARAMETER Function
# Function to call
#
#.PARAMETER TargetObjects
# Target Object is being verified
#
#.PARAMETER ExpectedValue
# Attribute to verify
#
#.EXAMPLE
# PreFlightCheck -Function "CheckHostVersion" -TargetObjects $HostObjects \
# -ExpectedValue $TargettedHostVersion
#
##############################################################################

Function PreFlightCheck
{
   param([parameter(Mandatory=$true)][string]$Function,[object]$TargetObjects,[object]$ExpectedValue)
      if(Get-Command $Function -ea SilentlyContinue) {
         #write-host $Function $TargetObjects $ExpectedValue
         & $Function $TargetObjects $ExpectedValue
      }
      else {
         # ignore
      }
}

##############################################################################
#.SYNOPSIS
# Get the Hosts connected to a datastores
#
#.DESCRIPTION
# Queries the List of datastores in VC and returns a hashmap with list of
# hosts connected to a datastore
# Key = Datastore Name
# Value = List of hosts connected
#
#.EXAMPLE
# $DatastoreHash = Get-HostsConnectedToDatastore
##############################################################################

Function Get-HostsConnectedToDatastore {
   $DatastoreHash = @{}
   $DatastoreObjects = Get-View -ViewType Datastore
   Foreach ($eachdatastoreObj in $DatastoreObjects) {
      $hostArray = Get-View -ID $eachdatastoreObj.Host.Key | ft -Property Name
      $DatastoreHash[$eachdatastoreObj.Name] = $hostArray
   }
   return $DatastoreHash
}

##############################################################################
#.SYNOPSIS
# Get the list of Datastoer associated with VM
#
#.DESCRIPTION
# Queries VM Object and construct a HashMap with Datastores associates
# with the VM
# Key = VM Name
# Value = List of Datastores associated
#
#.EXAMPLE
# $VmMap += Get-VmDatastore -Vm $vm
# Alternate option : Get-Datastore -Name "local-0" | Select $_ | Get-VM
##############################################################################

Function Get-VmDatastore {
       param([parameter(Mandatory=$true)][Object]$Vm="")
       $VmDatastoreMap = @{}
       foreach($datastore in $vm.Datastore) {
                $datastoreObj = Get-View -ID $datastore
                $dsNameList += , $datastoreObj.Name
        }
        $VmDatastoreMap[$vm.Name] = $dsNameList
       return $VmDatastoreMap
}

##############################################################################
#.SYNOPSIS
# PreFLight check for ESX version
#
#.DESCRIPTION
# Function check the host version
#
#.PARAMETER HostObjects
# Target Object is being verified
#
#.PARAMETER Version
# Expected Version
#
#.EXAMPLE
# $status = CheckHostVersion -HostObjects $hostObject -Version $version
##############################################################################

Function CheckHostVersion
{
   param([parameter(Mandatory=$true)][object]$HostObjects,[String]$Version)
   $status = $true
   $targetVersion = New-Object System.Version($version)
   $Hash = Get-HostVersion -EsxHosts $HostObjects
   foreach ($host in $HostObjects) {
      $hostName = $host.Name
      $hostVersion = New-Object System.Version($host.Config.Product.version)
      if($hostVersion -ge $targetVersion) {
         $status = $status -And $true
         Format-output -Text "VM host $hostName is of version $hostVersion" -Level "SUCCESS" -Phase "Pre-Check"
      } else {
         $status = $status -And $false
         Format-output -Text "VM host $hostName is of version $hostVersion" -Level "ERROR" -Phase "Pre-Check"
      }
   }

   return $status
}

##############################################################################
#
#.SYNOPSIS
# Format the log messages
#
#.DESCRIPTION
# Format the log message printed on the screen
# Also redirect the message to a log file
#
#.PARAMETER
# Text - log message to be printed
# Level - SUCCESS,INFO,ERROR
# Phase - Different phase of commandlet, Preperation,Migration,Roll back
#
#
#.EXAMPLE
# Format-output -Text $MsgText -Level "INFO" -Phase "Migration Pre-Check phase"
#
##############################################################################

Function Format-output {
param (
   [Parameter(Mandatory=$true)][string]$Text,
   [Parameter(Mandatory=$true)][string]$Level,
   [Parameter(Mandatory=$false)][string]$Phase
)
BEGIN {
   filter timestamp {"$(Get-Date -Format s) `[$Phase`] $Text" }
}

PROCESS {
   $Text | timestamp | Out-File -FilePath $global:LogFile -Append -Force
   if($Level -eq "SUCCESS" ) {
      $Text | timestamp | write-host -foregroundcolor "green"
   } elseif ( $Level -eq "INFO") {
      $Text | timestamp | write-host -foregroundcolor "yellow"
   }
   else {
      $Text | timestamp | write-host -foregroundcolor "red"
   }
}
}


function Concurrent-SvMotion {
<#
.SYNOPSIS
    Wrapper Funtion to Call Storage Vmotion
.DESCRIPTION
    You may send a list of vm names
.PARAMETER VM
    Pass vmnames
.PARAMETER Destination
    PASS Destination datastore name
.PARAMETER Destination
    PASS ParallelTasks to perform
.INPUTS
.OUTPUTS
.EXAMPLE
    Storage-Vmotion -VM $vmlist -Destination 'Datastore_1' -ParallelTasks 2
#>

   [CmdletBinding()]
   param (
      [Parameter(Mandatory = $true)][VMware.VimAutomation.ViCore.Util10.VersionedObjectImpl]$session,
      [Parameter(Mandatory = $true)][string[]]$VM,
      [Parameter(Mandatory = $true)][string]$Source,
      [Parameter(Mandatory = $true)][string]$Destination,
      [Parameter(Mandatory = $true)][int]$ParallelTasks
   )

   BEGIN {
       $TargetDatastore = $Destination
       $Date = get-date
       $VmsToMigrate = $VM
       $Failures = 0;
       $LoopCtrl = 1
       $VmInput = $VM
       $GB = 1024 * 1024 * 1024
       $BufferSize = 5
       $RelocateTaskList = @()
   }

   PROCESS {
      while ($LoopCtrl -gt 0) {
         $shiftedVm = shift -array ([ref]$vmInput) -numberOfElements $ParallelTasks
         $vmToMigrate = $shiftedVm
         $LoopCtrl = $vmInput.Count
         #Check the datastore contain sufficient space
         foreach ($TargetVm in $vmToMigrate) {
            $vm = Get-VM $TargetVm
            $vmSize += Get-VmDisksFootPrint $vm
         }
         #$ds = Get-Datastore -Name $TargetDatastore
         $vmSize = [math]::Round(($vmSize / $GB) + $BufferSize)
         $tagetDatastoreObj = Get-Datastore -Name $TargetDatastore
         if($tagetDatastoreObj.FreeSpaceGB -gt $vmSize) {
            $MsgText = "$TargetDatastore Contain FreeSpace of $($tagetDatastoreObj.FreeSpaceGB) GB to accomodate $vmToMigrate of size $vmSize GB"
            Format-output -Text $MsgText -Level "INFO" -Phase "Migration Pre-Check phase"
            $RelocateTaskList += Storage-Vmotion -session $session -Source $Source -VM $vmToMigrate -Destination $Destination
            # Iterate through has list of TaskMap and check for task failures
            foreach ($Task in $RelocateTaskList ) {
               if ( $Task["State"] -ne "Success" ) {
                  $Failure += 1
                  return $RelocateTaskList
               } else {
                  $Success += 1
               }
            }
         } else {
            #If insufficient datastore space just mark the migration task as failure
            $MsgText = "$TargetDatastore have insufficient space. FreeSpace of $($tagetDatastoreObj.FreeSpaceGB) GB to accomdate $vmToMigrate of size $vmSize GB"
            Format-output -Text $MsgText -Level "INFO" -Phase "Migration Pre-Check phase"
            $TaskMap = @{}
            $TaskMap["Name"] = $TargetVm
            $TaskMap["State"] = "Error"
            $TaskMap["Cause"] = "INSUFFICIENT_DATASTORE_SPACE"
            $RelocTaskList += $TaskMap
            return $RelocateTaskList
         }
     }
     return $RelocateTaskList
 }
}

function MoveTheVM {
   [CmdletBinding()]
   param (
      [Parameter(Mandatory=$true)][VMware.VimAutomation.ViCore.Util10.VersionedObjectImpl]$session,
      [Parameter(Mandatory=$true)][String]$VM,
      [Parameter(Mandatory=$true)][string]$Source,
      [Parameter(Mandatory=$true)][string]$Destination
   )
   BEGIN {
      $vm = $VM
      $datastore = $Source
      $tempdatastore = $Destination
   }
   PROCESS {
      try {
         $vmName=Get-VM -Name $vm
         $vmId = $vmName.id
         $MsgText ="VM = $vm, Datastore = $datastore and Target datastore = $tempdatastore and id is $vmId"
         Format-output -Text $MsgText -Level "INFO" -Phase "VM migration"
         $dsView=Get-View -viewtype Datastore -filter @{"Name"=$tempdatastore}
         $hds = Get-HardDisk -VM $vm
         $spec = New-Object VMware.Vim.VirtualMachineRelocateSpec
         $vmView=get-view -id $vmId
         if($vmView.Summary.Config.VmPathName.Contains($datastore)) {
            $spec.datastore = (Get-Datastore -Name $tempdatastore).Extensiondata.MoRef
         }
         $hds | %{
            if ($_.Filename.Contains($datastore)) {
               $disk = New-Object VMware.Vim.VirtualMachineRelocateSpecDiskLocator
               $disk.diskId = $_.ExtensionData.Key
               $disk.datastore = (Get-Datastore -Name $tempdatastore).Extensiondata.MoRef
               $spec.disk += $disk
            } else {
               $hdDS = $_.ExtensionData.Backing.FileName.Split("[,]")[1]
               $disk = New-Object VMware.Vim.VirtualMachineRelocateSpecDiskLocator
               $disk.diskId = $_.ExtensionData.Key
               $disk.datastore = (Get-Datastore -Name $hdDS).Extensiondata.MoRef
               $spec.disk += $disk
            }
         }
         $task = $vmName.Extensiondata.RelocateVM_Task($spec, "defaultPriority")
         $task1 = Get-Task -server $session | where { $_.id -eq $task }
         return $task1
      } catch {
         $errName = $_.Exception.GetType().FullName
         $errMsg = $_.Exception.Message
         Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Moving Virtual Machines"
         Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option. If problem persists, move all the VMs from $Source to $Destination manually and then try again." -Level "Error" -Phase "Moving Virtual Machines"
         Return
      }
   }
}

##############################################################################
#
#.SYNOPSIS
# Perform Concurrent Storage VMotion
#
#.DESCRIPTION
# Perform concurrent Migration based on no of Async task to run
# Continous DS space validation before migration
#
#.PARAMETER
# VM - List of VM names to Migrate
# Destination - Destination Datastore Names
# Return the TaskMap about VC migration task
#
#
#.EXAMPLE
# $RelocTaskList = Concurrent-SvMotion -VM $vmList \
# -Destination $TemporaryDatastore -ParallelTasks 2
#
##############################################################################

function Storage-Vmotion {
   [CmdletBinding()]
   param (
      [Parameter(Mandatory=$true)][VMware.VimAutomation.ViCore.Util10.VersionedObjectImpl]$session,
      [Parameter(Mandatory=$true)][string[]]$VM,
      [Parameter(Mandatory=$true)][string]$Source,
      [Parameter(Mandatory=$true)][string]$Destination
   )
   BEGIN {
      $TargetDatastore = $Destination
      $VmsToMigrate = $VM
      $RelocateTaskStatus = @()
      $Failures = 0
      $Success = 0
      $TaskTab = @{}
      $GB = 1024 * 1024 * 1024
      Set-Variable -Name vm -Scope Local
      Set-Variable -Name ds -Scope Local
   }
   PROCESS {
      foreach ($TargetVm in $VmsToMigrate) {
         $date = get-date
         Format-output -Text "$TargetVm : Migration is in progress From:$Source To:$TargetDatastore" -Level "INFO" -Phase "Migration"
         $task = MoveTheVM -VM $TargetVm -session $session -Source $Source -Destination $TargetDatastore
         $TaskTab[$task.id] = $TargetVm
      }
      # Get the status of running tasks
      $RunningTasks = $TaskTab.Count
      while($RunningTasks -gt 0) {
         Get-Task | % {
            if($TaskTab.ContainsKey($_.Id) -and $_.State -eq "Success") {
               $TaskMap = @{}
               $Success += 1
               $TaskMap["Name"] = $TaskTab[$_.Id]
               $TaskMap["TaskId"] = $_.Id
               $TaskMap["StartTime"] = $_.StartTime
               $TaskMap["EndTime"] = $_.FinishTime
               $TaskMap["State"] = $_.State
               $TaskMap["Cause"] = ""
               $TaskTab.Remove($_.Id)
               $RunningTasks--
               $RelocateTaskStatus += $TaskMap
            } elseif($TaskTab.ContainsKey($_.Id) -and $_.State -eq "Error"){
               $TaskMap = @{}
               $Failures += 1
               $TaskMap["Name"] = $TaskTab[$_.Id]
               $TaskMap["TaskId"] = $_.Id
               $TaskMap["StartTime"] = $_.StartTime
               $TaskMap["EndTime"] = $_.FinishTime
               $TaskMap["State"] = $_.State
               $TaskMap["Cause"] = ""
               $TaskTab.Remove($_.Id)
               $RunningTasks--
               $RelocateTaskStatus += $TaskMap
            }
         }
         Start-Sleep -Seconds 15
      }
   }
   END {
      Foreach($Tasks in $RelocateTaskStatus) {
         if ( $Tasks["State"] -eq "Success" ){
            $MsgText = "Migration of $($Tasks["Name"]) is successful Start Time : $($Tasks["StartTime"]) End Time : $($Tasks["EndTime"])"
            Format-output -Text $MsgText -Level "SUCCESS" -Phase "Migration"
         } else {
            $MsgText = "Migration of $($Tasks["Name"]) is failure Start Time : $($Tasks["StartTime"]) End Time : $($Tasks["EndTime"])"
            Format-output -Text $MsgText -Level "FAILURE" -Phase "Migration"
         }
      }
      return  $RelocateTaskStatus
   }
}
##############################################################################
#
#.SYNOPSIS
# Function to shift an array
#
#.DESCRIPTION
# Perform shift action similar to Perl shift
#
#.PARAMETER
# array - Array to shift
# numberOfElements - No of elements to shift
# On success Orginal array is resized
#
#
#.EXAMPLE
#
# $shiftedVm = shift -array ([ref]$array) -numberOfElements 2
#
##############################################################################

function shift {
   param (
      [Parameter(Mandatory=$true)][ref]$array,
      [Parameter(Mandatory=$true)][int]$numberOfElements
   )
   BEGIN {
      $shiftedValue = @()
      $temp = @()
      $temp = $array.Value
   }
   PROCESS {
      if($temp.Count -ge $numberOfElements ) {
         $Iterate =  $numberOfElements
      }
      else {
         $Iterate = $temp.Count
      }
      for($i=$Iterate; $i -gt 0 ; $i-=1) {
         $firstElement,$temp = $temp;
         $shiftedValue += $firstElement
      }
   }
   END {
      $array.value = $temp
      return $shiftedValue
   }
}

###############################################################################
#
#.SYNOPSIS
# Get the Items in a Datastore
#
#.DESCRIPTION
# Get the list of Items in a Datastore
#
#.PARAMETER
# Datastore - Name of the Datastore
#
#.EXAMPLE
# $list = Get-DatastoreItems -Datastore "local-0"
#
##############################################################################

function Get-DatastoreItems {
     param([Parameter(Mandatory=$true)][string]$Datastore,
           [Parameter()][Switch]$Recurse,
           [Parameter()][string]$fileType
          )
      
     $childItems = @()
     $datastoreObj = Get-DataStore -Name $Datastore    
     if($Recurse){
        $childItems = Get-ChildItem -Recurse $datastoreObj.DatastoreBrowserPath | Where-Object {$_.name.EndsWith($fileType)} 
     } else {
        $childItems = Get-ChildItem $datastoreObj.DatastoreBrowserPath | Where-Object {$_.name -notmatch "^[.]"}
     }
     return $childItems 
}

###############################################################################
#
#.SYNOPSIS
# Copy files from Source to Desintation
#
#.DESCRIPTION
# Copy Orphaned files, not registered in VC
#
#.PARAMETER
# SourceDatastore - Source
# DestinationDatastore - Destination
#
#.EXAMPLE
# $Return Status = Copy-DatastoreItems -SourceDatastore "local-0" \
# -DestinationDatastore "local-1"
#
##############################################################################

function Copy-DatastoreItems {
   param([Parameter(Mandatory=$true)][string]$SourceDatastore,
         [Parameter(Mandatory=$true)][string]$DestinationDatastore
   )

      $copyOrphanPhase = "Copying Orphaned data"
      $SrcChildItems = @()
      $DstChildItems = @()
      $sourceDsObj = get-datastore -Name $SourceDatastore
      $targetDsObj = get-datastore -Name $DestinationDatastore
      #Map Drives
      try{
         $sourceDrive = new-psdrive -Location $sourceDsObj -Name sourcePsDrive -PSProvider VimDatastore -Root "\" 
         $targetDrive = new-psdrive -Location $targetDsObj -Name targetPsDrive -PSProvider VimDatastore -Root "\" 
         $SrcChildItems = Get-DatastoreItems -Datastore $SourceDatastore 
         $DstChildItems = Get-DatastoreItems -Datastore $DestinationDatastore
         Format-output -Text "Copying Orphaned Items: $SrcChildItems" -Level "INFO" -Phase $copyOrphanPhase
         $Fileinfo = copy-datastoreitem -recurse -item sourcePsDrive:\* targetPsDrive:\ -force
      }  catch [Exception] {
         Remove-PSDrive -Name sourcePsDrive
         Remove-PSDrive -Name targetPsDrive
         $errName = $_.Exception.GetType().FullName
         $errMsg = $_.Exception.Message
         Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase $copyOrphanPhase
         Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option. If problem persists, move all the orphaned data from $SourceDatastore to $DestinationDatastore manually and then try again." -Level "ERROR" -Phase $copyOrphanPhase
         Return $false
      }
      Remove-PSDrive -Name sourcePsDrive
      Remove-PSDrive -Name targetPsDrive
      Return $true
}


####################################################################################
#
#.SYNOPSIS
# Return Success or Failure list of Tasks
#
#.DESCRIPTION
# This Function checks through the list of Task and return a list of success or
# Failure tasks based on the input
#
#.PARAMETER
# RelocateTasksList = List containing the Relocate Task Map
#
#.EXAMPLE
# $SuccessTaskList=Get-RelocTask -RelocateTasksList $migrateTaskList -State "SUCCESS"
#
####################################################################################

function Get-RelocTask {
   param (
      [Parameter(Mandatory=$true)][hashtable[]]$TasksList,
      [Parameter(Mandatory=$true)][string]$State
   )
   BEGIN {
      $SuccessList = @()
      $FailureList = @()
   }
   PROCESS {
      # Iterate through has list of TaskMap hash and check for task failures
      foreach ($Task in $TasksList ) {
         $NumberOfMigration += 1
         if ( $Task["State"] -ne "Success" ){
            $FailureList += $Task
         } else {
            $SuccessList += $Task
         }
      }
   }
   END {
      if($State -eq "SUCCESS") {
         return $SuccessList
      } else {
         return $FailureList
      }
   }
}

####################################################################################
#.SYNOPSIS
# Creats Zip file with the log folder
#
#.PARAMETER
# $logdir = Log directory to zip/archive
#
#
#
####################################################################################
function Zip-Logs{
   param( [Parameter(Mandatory=$true)][string] $logdir
         )
    $sourceDir = "$pwd\$logdir"
    $LogTime = Get-Date -Format "MM-dd-yyyy_hh-mm-ss"
    $destination = "$pwd\$logdir"+"_"+"$LogTime.zip"
    If(Test-path $destination) {Remove-item $destination}
    Add-Type -assembly "system.io.compression.filesystem"
    [io.compression.zipfile]::CreateFromDirectory($sourceDir, $destination) 
    Format-output -Text "Zip file is available at: $destination" -Level "INFO" -Phase "Log Zip"
}


####################################################################################
#
#.SYNOPSIS
# Unmount the datastore
#
#.DESCRIPTION
# Unmount the datastore from all connected hosts
#
#.PARAMETER
# Datastore = Datastore to unmount
#
#.EXAMPLE
#
# Unmount-Datastore -Datastore "local-0"
#
####################################################################################

function Unmount-Datastore {
   [CmdletBinding()]
   Param (
      [Parameter(ValueFromPipeline=$true)][string]$Datastore
   )
   BEGIN {
      $dsObject = Get-Datastore -Name $Datastore
   }
   Process {
      Foreach ($eachDsObj in $dsObject) {
         $hostviewDSDiskName = $eachDsObj.ExtensionData.Info.vmfs.extent[0].Diskname
         if ($eachDsObj.ExtensionData.Host) {
            $attachedHosts = $eachDsObj.ExtensionData.Host
            Foreach ($VMHost in $attachedHosts) {
               $hostview = Get-View $VMHost.Key
               $mounted = $VMHost.MountInfo.Mounted
               #If the device is mounted then unmount it
               if ($mounted -eq $true) {
                  $StorageSys = Get-View $HostView.ConfigManager.StorageSystem
                  Format-output -Text "Unmounting VMFS Datastore $($eachDsObj.Name) from host $($hostview.Name)..." -Level "INFO" -Phase "Unmount Datastore"
                  $StorageSys.UnmountVmfsVolume($eachDsObj.ExtensionData.Info.vmfs.uuid);
               } else {
                  Format-output -Text "VMFS Datastore $($eachDsObj.Name) is already unmounted on host $($hostview.Name)..." -Level "INFO" -Phase "Unmount Datastore"
               }
            }
         }
      }
   }
}

####################################################################################
#
#.SYNOPSIS
# Remove a datastore
#
#.DESCRIPTION
# Remove a datastore
#
#.PARAMETER
# Datastore = Datastore to delete
#
#.EXAMPLE
#
# Delete-Datastore -Datastore "local-0"
#
####################################################################################

Function Delete-Datastore {
   [CmdletBinding()]
   Param (
      [Parameter(ValueFromPipeline=$true)] [string]$Datastore
   )
   BEGIN {
      $dsObjectList = Get-Datastore -Name $Datastore
   }
   Process {
      Foreach ($eachDsObj in $dsObjectList) {
         if ($eachDsObj.ExtensionData.Host) {
            $attachedHosts = $ds.ExtensionData.Host
            $deleted = $false
            Foreach ($VMHost in $attachedHosts) {
               $hostview = Get-View $VMHost.Key
               if($deleted -eq $false) {
                  Format-output -Text "Removing Datastore $($eachDsObj.Name) on host $($hostview.Name)..." -Level "INFO" -Phase "Delete Datastore"
                  Remove-Datastore -Datastore $Datastore -VMHost $hostview.Name -Confirm:$false
                  $deleted = $true
               }
            }
         }
      }
   }
}

####################################################################################
#
#.SYNOPSIS
# Create a Vmfs6 datastore
#
#.DESCRIPTION
# Create a New Vmfs6 volume on the give Lun a datastore
#
#.PARAMETER
# LunCanonical = Canonical name of lun
# hostConnected = Hostobjects
#
#.EXAMPLE
#
# $LunCanonical = Get-ScsiLun -Datastore $Datastore | select -Property CanonicalName
# $hostConnected = Get-VMHost -Datastore $Datastore
# Create-Datastore -LunCanonical $LunCanonical -hostConnected $hostConnected
#
#
####################################################################################

Function Create-Datastore {
   [CmdletBinding()]
   Param (
      [Parameter(ValueFromPipeline=$true)] $LunCanonical,
      [Parameter(ValueFromPipeline=$true)] $hostConnected
   )

  Process {
     $device = @()
     $device = $LunCanonical
     $isCreated = $false
     $found = $True
     #check if the Datastore is still mounted or not in a busy vCenter
     if( Test-Path $variableFolder\$Vmfs6Datastore.xml ){
       $newVmfs6Datastore = Import-Clixml $variableFolder\$Vmfs6Datastore.xml
       $Datastore = Get-Datastore -Name $newVmfs6Datastore.Name
     } 
     #$Datastore1 = Get-Datastore -Name $Datastore.Name:
     #This will fail, becaue $Datastore is already removed from host
     $fileSystemVersion = ($Datastore.FileSystemVersion).Split('.')[0]
     while($found -and ($fileSystemVersion -eq 5) ){
        $srcDs = @() 
        $srcDs  += Get-Datastore     
        if ( !$srcDs.contains($Datastore)) {
            $found = $False
        } 
     }

     $hostScsiDisk = @()
     foreach($mgdHost in $hostConnected) {
        $path = $null
        if($isCreated -eq $false ) { 
           if($device -is [System.Array] ) { 
              $path = $device[0]
           } else {
              $path = $device
           }

           if( $fileSystemVersion -lt 6 ){
              New-Datastore -VMHost $mgdHost.Name  -Name $Datastore.Name -Path $path -Vmfs -FileSystemVersion 6 | Out-Null
              Format-output -Text "Create new datastore is done" -Level "INFO" -Phase "Datastore Create"
              $newVmfs6Datastore = Get-Datastore -Name $Datastore.Name | Export-Clixml $variableFolder\$vmfs6Datastore.xml
           }
           # if we have more than one unique $device per datastore, we need to expand the current DS.
           if($device.Count -gt 1 ){
             $newDatastoreObj = Get-Datastore -Name $Datastore -ErrorAction SilentlyContinue             
             $BaseExtent = $newDatastoreObj.ExtensionData.Info.Vmfs.Extent | Select -ExpandProperty DiskName
             $hostSys = Get-View -Id ($newDatastoreObj.ExtensionData.Host | Get-Random | Select -ExpandProperty Key)
             $DataStoreSys = Get-View -Id $hostSys.ConfigManager.DatastoreSystem
             $hostScsiDisk = $DataStoreSys.QueryAvailableDisksForVmfs($newDatastoreObj.ExtensionData.MoRef)
             $existingLuns = Get-ScsiLun -Datastore $Datastore.Name |select -ExpandProperty CanonicalName|select -Unique 
             $newDevList = Compare-Object  $device $existingLuns -PassThru
             foreach($eachDevice in $newDevList){
                 # expand the datastore.
                 $canName = Get-ScsiLun -CanonicalName $eachDevice -VmHost $mgdHost.Name
                 $lun = $hostScsiDisk | where{ $BaseExtent -notcontains $_.CanonicalName -and $_.CanonicalName -eq $CanName }
                 $vmfsExtendOpts = $DataStoreSys.QueryVmfsDatastoreExtendOptions($newDatastoreObj.ExtensionData.MoRef, $lun.DevicePath, $null)                    
                    $spec = $vmfsExtendOpts.Spec
                 $DataStoreSys.ExtendVmfsDatastore($newDatastoreObj.ExtensionData.MoRef, $spec)
                 Format-output -Text "Extending of datastore is done" -Level "INFO" -Phase "Extend Datastore"
              }
            }
            $isCreated = $true

         }
         #refresh storage on this host and see if the datastore created can be fetched from $mdgHost.
         $mgdHostDatastores = Get-Datastore -VMHost $mgdHost.Name
         if($mgdHostDatastores -contains $Datastore ){
              Format-output -Text "The datastore $Datastore found on host: $mgdHost " -Level "INFO" -Phase "VMFS6 Verify"
         }
      }
   }   
}

#.ExternalHelp StorageUtility.psm1-help.xml
Function Update-VmfsDatastore {
   [CmdletBinding(SupportsShouldProcess=$true,  ConfirmImpact='High')]
   param (
      [Parameter(Mandatory=$true)][VMware.VimAutomation.ViCore.Types.V1.VIServer]$Server,
      [Parameter(Mandatory=$true, ValueFromPipeline=$true)][VMware.VimAutomation.ViCore.Types.V1.DatastoreManagement.Datastore]$Datastore,
      [Parameter(Mandatory=$true)][VMware.VimAutomation.ViCore.Types.V1.DatastoreManagement.Datastore]$TemporaryDatastore,
      [Parameter()][Int32]$TargetVmfsVersion,
      [Switch]$Rollback,
      [Switch]$Resume,
      [Switch]$Force
   )

   $variableFolder = "log_folder_$($Server.Name)_$($Datastore.Name)"
   if(!(Test-Path $variableFolder)){ New-Item -ItemType directory -Path $variableFolder | Out-Null }
   #check point saved for each stage
   $checkFile = "check$($Server.Name)$($Datastore.Name)"
   $LogTime = Get-Date -Format "MM-dd-yyyy_hh-mm-ss"
   $workingDirectory = (Get-Item -Path $variableFolder -Verbose).FullName
   $global:LogFile = "$workingDirectory" + "\Datastore_Upgrade_" + $LogTime + ".log"
   Format-output -Text "Log folder path: $pwd$variableFolder" -Level "INFO" -Phase  "Preparation"
   Format-output -Text "Log file path: $global:LogFile" -Level "INFO" -Phase  "Preparation"
   Format-output -Text "Checkpoint file path: $checkFile" -Level "INFO" -Phase  "Preparation"
   $caption = "WARNING !!"
   $warning = "Update VMFS datastore. This operation will delete the datastore to update and will re-create the VMFS 6 datastore using the same LUN. Do yo want to continue?"
   $description = "This operation will delete the datastore to update and will re-create the VMFS 6 datastore using the same LUN."
   Format-output -Text "The datastore $Datastore will deleted and Recreated with VMFS-6." -Level "ERROR" -Phase "Preparation"
   if ($PSCmdlet.ShouldProcess($description, $warning, $caption) -eq $false) {
      Return
   }
   
   # Check if HBR or SRM is enabled
   $warningCaption = "WARNING !!"
   $warningQuery = "The update to VMFS-6 of VMFS-5 datastore should not be done if HBR or SRM is enabled. Do you still want to continue?"
   Format-output -Text "The datastore $Datastore Should not be part of HBR[Target/Source] / SRM config." -Level "ERROR" -Phase "Preparation"
   if (($Force -Or $PSCmdlet.ShouldContinue($warningQuery, $warningCaption)) -eq $false) {
      Return
   }

   #Workflow begins here
   
   # Check that target VMFS version is 6. only 6 is supported at present
   if ($TargetVmfsVersion -ne 0 -and $TargetVmfsVersion -ne 6) {
      Format-output -Text "Update to target VMFS version $TargetVmfsVersion is not supported. Only VMFS 6 is supported as target VMFS version" -Level "ERROR" -Phase "Preparation"
      Return
   }
   
   #Check PrimaryDatastore is present in the Datastore list from VC
   $PrimaryDsStaus = Get-Datastore |where { $_.Name -eq $Datastore.Name}
   $DatastoreName = $null
   
   
   if($PrimaryDsStaus -ne $null){
     $PrimaryDatastore = Get-Datastore $Datastore.Name
     if ($PrimaryDatastore -eq $null) {
        Format-output -Text "The datastore $Datastore does not exist or has been removed." -Level "ERROR" -Phase "Preparation"
        Return
     }
     $Datastore |Export-Clixml $variableFolder/PrimaryDs.xml
   }
   # Verify thet the specified server is vCenter server
   $vcType = [VMware.VimAutomation.ViCore.Interop.V1.ApiType]::VirtualCenter
   if ($server.Client.ConnectivityService.GetApiInfo().ApiType -ne $vcType) {
      Format-output -Text "The specified server is not a vCenter server." -Level "ERROR" -Phase "Preparation"
      Return
   }

   # Verify the vCenter server is of $targetServerVersion or higher
   $targetServerVersion = New-Object System.Version("6.5.0")
   $vcVersion = New-Object System.Version($Server.Version)
   if ($vcVersion -lt $targetServerVersion) {
      Format-output -Text "The vCenter server is not upgraded to $targetServerVersion." -Level "ERROR" -Phase "Preflight Check"
      Return
   }
   
   # Verify that $PrimaryDatastore and $TemporaryDatastore are in specified vCenter server
   if( $PrimaryDsStaus -ne $null ){
    $ds = Get-Datastore -Id $PrimaryDatastore.Id -Server $Server
    if ($ds -eq $null -Or $ds.Uid -ne $PrimaryDatastore.Uid) {
      Format-output -Text "The datastore $PrimaryDatastore is not present in specified vCenter $Server." -Level "ERROR" -Phase "Preflight Check"
      Return
    }
   }
   $tempDs = Get-Datastore -Id $TemporaryDatastore.Id -Server $Server
   if ($tempDs -eq $null -Or $tempDs.Uid -ne $TemporaryDatastore.Uid) {
      Format-output -Text "The temporary datastore $TemporaryDatastore is not present in specified vCenter $Server." -Level "ERROR" -Phase "Preflight Check"
      Return
   }
   
   #Verify if FCD disks are present in the primary datastore
   $vdisk = get-vdisk -datastore $PrimaryDatastore
   if($vdisk -ne $null) {
      $msgText = "FCD disks can't be moved. Please migrate them then start the commandlet again."
      Format-output -Text "$msg1" -Level "ERROR" -Phase "Preflight Check"
      Return
   }

   #Verify if the Host connected to Primary datastore is part of HA
   $cluster = Get-VMHost -Datastore $PrimaryDatastore |Get-Cluster
   if($cluster) {
      if($cluster.HAEnabled){
         $msg1 = "The host connected to datastore $PrimaryDatastore is part of HA cluster"
         Format-output -Text "$msg1" -Level "INFO" -Phase "Preflight Check"
      }
   }
   
   # Verify that VADP is disable. If enabled quit
   Format-output -Text "checking if VADP is enabled on any of the VMs" -Level "INFO" -Phase "Preflight Check"
   if( $PrimaryDsStaus -ne $null ){
      $vmList = Get-VM -Datastore $PrimaryDatastore
      Format-output -Text "Checking for VADP enabled VM(s)" -Level "INFO" -Phase "Preflight Check"
      foreach ($vm in $vmList) {
         $disabledMethods = $vm.ExtensionData.DisabledMethod
         if ($disabledMethods -contains 'RelocateVM_Task') {
            Format-output -Text "Cannot move virtual machine $vm because migration is disabled on it." -Level "ERROR" -Phase "Preflight Check"
            Return
         }
      }
   
      # Verify that SMPFT is not turned ON
      Format-output -Text "checking if SMPFT is enabled on any of the VMs" -Level "INFO" -Phase "Preflight Check"
      foreach ($vm in $vmList) {
        $vmRuntime = $vm.ExtensionData.Runtime
        if ($vmRuntime -ne $null -and $vmRuntime.FaultToleranceState -ne 'notConfigured') {
            Format-output -Text "Cannot move VM $vm because FT is configured for this VM." -Level "ERROR" -Phase "Preflight Check"
            Return
        }
      }
   
      #If PrimaryDs is part of DsCluster the TempDs should be part of same DsCluster
      $primeDsCluster = Get-DatastoreCluster -Datastore $PrimaryDatastore
      $tempDsCluster  = Get-DatastoreCluster -Datastore $TemporaryDatastore
      if(($primeDsCluster -ne $tempDsCluster) -and !$Resume){
          Format-output -Text "Both Primary/Source Datastore and Temparory Datastore should be part of same sDrs-Cluster : $primeDsCluster" -Level "ERROR" -Phase "Preflight Check"
          Return
      }

      # Verify MSCS, Oracle cluster is not enabled
      Format-output -Text "checking if MSCS/Oracle[RAC] Cluster is configured on any of the VMs" -Level "INFO" -Phase "Preflight Check"
      if ($vmList -ne $null){
            $hdList = Get-HardDisk -VM $vmList
            foreach ($hd in $hdList) {
                if ($hd.ExtensionData.Backing.Sharing -eq 'sharingMultiWriter') {
                    $vm = $hd.Parent
                    $msg1= "The disk:$hd is in Sharing mode -Multi-writer flag is on. The virtual machine:$vm may be part of a cluster"
                    $msg2= "If you want to proceed please disable the cluster settings on VM and -Resume again."
                    Format-output -Text "$msg1, $msg2" -Level "ERROR" -Phase "Preflight Check"
                    Return
                } else {
                    $scsiController = Get-ScsiController -HardDisk $hd
                    if (($scsiController.UnitNumber -ge 1) -and ($scsiController.BusSharingMode -ne 'NoSharing')) {
                    $msg1= "The scsi controller:$scsiController attached to the $vm is in sharing mode and hence the VM cannot be migrated. The VM may be part of a cluster"
                    $msg2= "If you want to proceed please disable the cluster settings on VM and -Resume again."
                    Format-output -Text "$msg1,$msg2" -Level "ERROR" -Phase "Preflight Check"
                    Return
                    }
                }
            }
        }
   }

   $ErrorActionPreference = "stop"
   $checkCompleted = $null
   $ImportPrimeDs = Import-Clixml $variableFolder/PrimaryDs.xml
   $DatastoreName = $ImportPrimeDs.Name
   $RollBackOption = $Rollback 
    if($RollBackOption -eq $true -and $Resume -eq $true) {
       write-host "Both Resume and Staging-rollback cannot be true at the same time. Returning.."
       Return
    }
    
    if($Resume -eq $true -or $RollBackOption -eq $true) {
       if(Test-Path $checkFile){
          $checkCompleted = get-content $checkFile
          $checkCompleted = $checkCompleted -as [int]
          if ($checkCompleted -eq $null -and $Resume -eq $True){
             $datastoreFsVersion = (Get-Datastore -name $DatastoreName).FileSystemVersion.split('.')[0]
             if($datastoreFsVersion -eq 6) {
                # In case post vmfs update, if the checkpoint get corrupted then cmdlet can't proceed futher.
                Format-output -Text "Datastore is of VMFS-6 type and " -Level "ERROR" -Phase "Resume-Post Update" 
                Format-output -Text "check-point file is corrupted so cannot proceed further. Manually move back the contents from Temporary Datastore " -Level "ERROR" -Phase "Resume-Post Update" 
                Return
             }
             Format-output -Text "check-point file is corrupted/not found, proceeds from beginning" -Level "INFO" -Phase "Preparation" 
          }
       } elseif($RollBackOption -eq $false) {
          $datastoreFsVersion = (Get-Datastore -name $DatastoreName).FileSystemVersion.split('.')[0]
          if($datastoreFsVersion -eq 6 -and $Resume -eq $true) {
             # In case post vmfs update, if the checkpoint file removed then cmdlet can't proceed futher.
             # If checkpoint file is missing post vmfs update cmdlet don't know the progress, so throw error
             Format-output -Text "Datastore is of VMFS-6 type and " -Level "ERROR" -Phase "Resume-Post Update" 
             Format-output -Text "check-point file is not available so cannot proceed further. Manually move back the contents from Temporary Datastore " -Level "ERROR" -Phase "Resume-Post Update" 
             Return
          } #pre vmfs6 update proceed the resume from beginning
          $checkCompleted = 0
          Format-output -Text "Writing checkCompleted : $checkCompleted" -Level "INFO" -Phase "Preparation"
          $checkCompleted | out-file $checkFile
       }
    } else {
       $checkCompleted = 0
       $checkCompleted | out-file $checkFile
    }
    if($RollBackOption -eq $true ) {
       if($checkCompleted -eq $null){
          Format-output -Text "check-point file is corrupted/not found cannot roll back. Manually move back the contents from Temporary Datastore " -Level "ERROR" -Phase "Roll Back" 
          Return
       } elseif($checkCompleted -lt 5){
          $msgText = "No action performed previously to Roll back, Rollback is not needed"
          Format-output -Text $msgText -Level "INFO" -Phase "Roll-back"
          Return
       }
       $checkCompleted = $checkCompleted + 1
       $dsCheck = Get-Datastore -name $DatastoreName
       if($dsCheck.Type.Equals('VMFS')) {
             if(($dsCheck.FileSystemVersion).split('.')[0] -eq 6) {
                $msgText1 = "Datastore is upgraded to VMFS6.Upgrade is in post-upgrade stage,can not rollback. Returning"
                $msgText2 = "At this stage only -Resume is allowed"
                Format-output -Text "$msgText1, $msgText2" -Level "Error" -Phase "Pre-Roll Back Check"
                Return
             }
       } else {
          $msgText = "Datastore to upgrade is not of VMFS type. Returning."
          Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
          Return
       }
       if($checkCompleted -ge 9) {
          $msgText = "Moving VMs back to original datastore, if present."
          Format-output -Text $msgText -Level "INFO" -Phase "VM Migration"
          $vmList = @()
          $vms = Get-Datastore $TemporaryDatastore | Get-VM
          foreach($eachVM in $vms ){
                $vmList += $eachVM.Name 
          }
          try {
             if($vmList.Count -gt 0) {
                $RelocTaskList = Concurrent-SvMotion -session $Server -Source $TemporaryDatastore -VM $vmList -Destination $DatastoreName -ParallelTasks 2
                foreach($eachTask in $RelocTaskList){
                   if($eachTask["State"] -ne "Success"){ 
                      Format-output -Text "VM failed to Migrate try running the commandlet again with -Resume option." -Level "Error" -Phase "VM Migration"
                      Return
                   }
                }
             }
          } catch {
             $errName = $_.Exception.GetType().FullName
             $errMsg = $_.Exception.Message
             Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Moving Vms during Rollback."
             Format-output -Text "Unable to proceed, try running the commandlet again. If problem persists, move all the VMs from $TemporaryDataStore to $DatastoreName manually and then try again." -Level "ERROR" -Phase "Moving VMs during rollback."
             Return
          }
       }

       if($checkCompleted -ge 11) {
          $msgText = "Moving orphaned data back to original datastore, if present"
          Format-output -Text $msgText -Level "INFO" -Phase "Roll-back Orphan data"
          try {
             $dsItems = Get-DatastoreItems -Datastore $TemporaryDatastore
             if(($dsItems -ne $null) -and ($dsItems.Count) -gt 0 ) {
                Format-output -Text "Moving Orphaned items to $DatastoreName" -Level "INFO" -Phase "Copying Orphaned Items"
                Format-output -Text "all the contents already available in $DatastoreName; so skip copy from $TemporaryDatastore" -Level "INFO" -Phase "Copying Orphaned Items"
                #Copy-DatastoreItems -SourceDatastore $TemporaryDatastore -DestinationDatastore $DatastoreName
                #new-psdrive -Location $tempds -Name tempds -PSProvider VimDatastore -Root "\" | Out-Null
             }
             #Register template VM[s] back in respective hosts.
             if(Test-Path $variableFolder\SrcTemplateMap.xml){
                 $SrcTemplateMap = Import-Clixml $variableFolder\SrcTemplateMap.xml
                 foreach( $templatePath in $SrcTemplateMap.Keys){
                   try {
                     $register = New-Template �VMHost $SrcTemplateMap[$templatePath] -TemplateFilePath $templatePath
                     $esxHost= $SrcTemplateMap[$templatePath]
                     Format-output -Text "Template VM registered in host $esxHost " -Level "INFO" -Phase "Template Register" 
                   } catch{
                     $errName = $_.Exception.GetType().FullName
                     if( $errName -match  "AlreadyExists"){Format-output -Text "$templatePath :Template already registered" -Level "INFO" -Phase "Template Register"}
                   }
                 }
             } 

          } catch {
             $errName = $_.Exception.GetType().FullName
             $errMsg = $_.Exception.Message
             Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Moving orphaned data"
             Format-output -Text "Unable to proceed, try running the commandlet again. If problem persists, move all the orphaned data from $TemporaryDataStore to $DatastoreName manually and then try again." -Level "ERROR" -Phase "Moving orphaned data."
             Return
          }
       }
       if($checkCompleted -ge 8){
          $msgText = "Changing back datastore cluster properties to previous State."
          Format-output -Text $msgText -Level "INFO" -Phase "SDRS Cluster"
          if(Test-Path $variableFolder\sdrsCluster.xml) {
             $dsCluster =  Import-CliXml $variableFolder\sdrsCluster.xml
             if($dsCluster.Name -ne $null) {
                $datastorecluster = get-datastorecluster -Name $dsCluster.Name
             }
          }      
          if(Test-Path $variableFolder\oldAutomationLevel.xml) {
             $oldAutomationLevel = Import-CliXml $variableFolder\oldAutomationLevel.xml
          }
          if(Test-Path $variableFolder\ioloadbalanced.xml) {
             $ioloadbalanced = Import-CliXml $variableFolder\ioloadbalanced.xml
          }
          
          if($oldAutomationLevel) {
                set-datastorecluster -datastorecluster $datastorecluster -sdrsautomationlevel $oldAutomationLevel | Out-Null
          }
          if($ioloadbalanced) {
              set-datastorecluster -datastorecluster $datastorecluster -IOLoadBalanceEnabled $ioloadbalanced | Out-Null
          }
       }
       if($checkCompleted -ge 7) {
          $msgText = "Changing datastore properties to previous State"
          Format-output -Text $msgText -Level "INFO" -Phase "StorageIOControl"
          if(Test-Path $variableFolder\ds1iocontrol.xml) {
             $ds1iocontrol = Import-CliXml $variableFolder\ds1iocontrol.xml
          }
          if(Test-Path $variableFolder\ds2iocontrol.xml) {
             $ds2iocontrol = Import-CliXml $variableFolder\ds2iocontrol.xml
          }
          if($ds1iocontrol){
             (Get-Datastore -Name $DatastoreName) | set-datastore -storageIOControlEnabled $ds1iocontrol | Out-Null
          }
          if($ds2iocontrol){
             (Get-Datastore -Name $TemporaryDatastore) | set-datastore -storageIOControlEnable $ds2iocontrol | Out-Null
          }
       }
       if($checkCompleted -ge 6) {
          $msgText = "Changing cluster properties to previous State"
          Format-output -Text $msgText -Level "INFO" -Phase "Cluster properties"
          if(Test-Path $variableFolder\drsMap.xml){
             $drsMap = Import-CliXml $variableFolder\drsMap.xml
          }
          if(Test-Path $variableFolder\clusters.xml){
             $tempClus = Import-CliXml $variableFolder\clusters.xml
             if($tempClus.Name -ne $null) {
                $clusters = get-cluster -Name $tempClus.Name
             }
          }
          if($clusters -and $drsMap){
             foreach($clus in $clusters) {
                Set-Cluster -Cluster $clus -DrsAutomationLevel $drsMap[$clus.Name] -confirm:$false | Out-Null
             }
          }
       }
       Format-output -Text "Rollback completed successfully" -Level "INFO" -Phase "Rollback successful"
       Zip-Logs -logdir $variableFolder
       Remove-Item $variableFolder -recurse
       Remove-Item $checkFile
       $errorActionPreference = 'continue'
       
       Return
    } 
    #check 1
    $tempDsItems = Get-DatastoreItems -Datastore $TemporaryDatastore
    try {
       if($checkCompleted -lt 1){
          if($tempDsItems -ne $null -and !$RollBackOption -and !$Resume) {
             Format-output -Text "$TemporaryDatastore is not Empty:$tempDsItems this operation could cause damage to files in $TemporaryDatastore. Returning" -Level "Error" -Phase "Querying Temporary datastore"
             Return
          }
          $checkCompleted = 1
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Querying Temporary datastore"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "Error" -Phase "Querying Temporary datastore"
       Return
    }

    # check 2
    # Check if hosts connected to DS are upgraded
    try {
      if($checkCompleted -lt 2) {
          $hostConnectedToDs = Get-VMHost -Datastore $Datastore
          $hostObjects = Get-View -VIObject $hostConnectedToDs
          $status = CheckHostVersion -HostObjects $hostObjects -Version $targetServerVersion
          if($status -eq $false) {
             Format-output -Text "Hosts are not upgraded to $targetServerVersion. Returning " -Level "INFO" -Phase "Preflight Check"
             Return
          }

         # All hosts connected to DS should be also connected to temp DS
         $hostConnectedToTempDs = Get-VMHost -Datastore $TemporaryDatastore
         Format-output -Text "checking if the Target Datastore is accessbile to all the Hosts, as of Source" -Level "INFO" -Phase "Preflight Check"
         if (Compare-Object $hostConnectedToDs $hostConnectedToTempDs -PassThru){
           $msg1= "Temporary datastore $TemporaryDatstore is not accessible from one or more host(s)"
           $msg2= "Ensure the Hosts connected to Source and Temporary Datastores are same."
           Format-output -Text "$msg1,$msg2" -Level "ERROR" -Phase "Preflight Check" 
           Return
         }

         $checkCompleted = 2
         $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Querying Hosts"
       $msg1= "Unable to proceed, try running the commandlet again with -Resume option"
       $msg2= "Or Source datastore might be re-created with VMFS-6 filesystem"
       Format-output -Text "$msg1, $msg2" -Level "Error" -Phase "Querying Hosts"
       Return
    }

    #Check if the Temporary DS size is >= Size of DS requiring Vmfs6 upgrade

    $tmpDs = $TemporaryDatastore
    $tmpDsSize = [math]::Round($tmpDs.CapacityMB)

    # Check 3
    try {
       if($checkCompleted -lt 3) {
          if($tmpDs.Type.Equals('VMFS')) {
             Format-output -Text "checking if Temporary Datastore is of VMFS-5 type" -Level "INFO" -Phase "Preflight Check"
             if($tmpDs.FileSystemVersion -lt 6 -and $tmpDs.FileSystemVersion -gt 4.999) {
                $msgText = "$TemporaryDatastore is of VMFS 5 type"
                Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
             } else {
                $msgText = "$TemporaryDatastore is not of VMFS 5 type, Returning."
                Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
                Return
             }
          } else {
             $msgText = "$TemporaryDatastore is not of VMFS 5 type, Returning.."
             Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
             Return
          }
          $checkCompleted = 3
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Querying Temporary datastore"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "Error" -Phase "Querying Temporary datastore"
       Return
    }

    # Check 4
    try {
       if($checkCompleted -lt 4){
          $datastoreObj1 = Get-Datastore -Name $DatastoreName
          $dsSize = [math]::Round($datastoreObj1.CapacityMB)
          Format-output -Text "checking Datastores capacity" -Level "INFO" -Phase "Preflight Check"
          if($tmpDsSize -ge $dsSize) {
             $msgText = "$TemporaryDatastore having Capacity : $tmpDsSize MB Greater or Equal than $DatastoreName capacity : $dsSize MB"
             Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
          } else {
             $msgText = "$TemporaryDatastore having Capacity : $tmpDsSize MB lesser than $DatastoreName capacity : $dsSize MB. Returning.."
             Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
             Return
          }
          $checkCompleted = 4
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Querying Temporary datastore"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "Error" -Phase "Querying Temporary datastore"
       Return
    }
    # Get all the VMs connected
    $VirtualMachineObjects = Get-View -ViewType VirtualMachine

    # Get All the host connected to datastores
    $DatastoreHostMap = Get-HostsConnectedToDatastore

    # For each Connected VM get the Datastores associated
    Foreach ($vm in $VirtualMachineObjects) {
       $VmMap +=  Get-VmDatastore -Vm $vm
    }
    $RelocTaskList = @()
    $RelocTaskList1 = @()
    # Iterate through the $VmMap and perform the storage vMotion
    $esxMap = @{}
    $esxUser = @{}
    $esxPass = @{}
    $esxLoc = @{}
    $countesx=0
    #check 5
    try {
       if($checkCompleted -lt 5) {
          $dsCheck = Get-Datastore -name $DatastoreName
          if($dsCheck.Type.Equals('VMFS')) {
             if($dsCheck.FileSystemVersion -lt 6 -and $dsCheck.FileSystemVersion -gt 4.999) {
                $msgText = "$DatastoreName to upgrade is of VMFS 5 type"
                Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
             } else {
                $msgText = "$DatastoreName to upgrade is not of VMFS 5 type, Returning."
                Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
                Return
             }
          } else {
             $msgText = "$DatastoreName to upgrade is not of VMFS 5 type, Returning.."
             Format-output -Text $msgText -Level "INFO" -Phase "Preflight Check"
             Return
          }
          $checkCompleted = 5
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Querying datastore version"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "Error" -Phase "Querying datastore version"
       Return
    }

    # Setting DRS automation level to manual of cluster.
    $drsAutoLevel = $null
    try {
       #$dsCluster = Get-DatastoreCluster -datastore $DatastoreName
       $drsMap = @{}
       $clusters = @()
       # check 6
       if( $checkCompleted -lt 6 )  {
          #$clusters=get-cluster
          $clusters = Get-Datastore -Name  $DatastoreName |Get-VMHost|Get-Cluster
          $datastoreCluster = Get-DatastoreCluster -datastore $DatastoreName
          $msgText = "Changing DrsAutomationLevel of clusters to manual. Will be reverted to original once operation is completed."          
          foreach($clus in $clusters) {
             $drsMap[$clus.Name]=$clus.DrsAutomationLevel
          }
          if ($drsMap -ne $null){$drsMap | Export-CliXml $variableFolder\drsMap.xml }
          if ($datastoreCluster-ne $null){$datastoreCluster | Export-CliXml $variableFolder\sdrsCluster.xml}
          if($clusters -ne $null){$clusters | Export-CliXml $variableFolder\clusters.xml}
          foreach($clus in $clusters) {
             if($clus.DrsEnabled){
                Format-output -Text $msgText -Level "INFO" -Phase "DRS Cluster Settings"
                Set-Cluster -Cluster $clus -DrsAutomationLevel Manual -confirm:$false | Out-Null
             }
          }
          $checkCompleted = 6
          $checkCompleted | out-file $checkFile
       } else {
          if(Test-Path $variableFolder\drsMap.xml) {
             $drsMap = Import-CliXml $variableFolder\drsMap.xml
          } else {
             Format-output -Text "Unable to find the configuration files no changes done to DRS cluster." -Level "INFO" -Phase "Querying DRS"
          }
          if(Test-Path $variableFolder\sdrsCluster.xml){
             $datastoreCluster = Import-CliXml $variableFolder\sdrsCluster.xml
          } else {
             Format-output -Text "Unable to find the configuration files no changes will be done SDRS cluster." -Level "INFO" -Phase "Querying SDRS"
          }
          if(Test-Path $variableFolder\clusters.xml){
             $tempClus = Import-CliXml $variableFolder\clusters.xml
             if($tempClus.Name -ne $null) {
                $clusters = get-cluster -Name $tempClus.Name
             }
          } else {
             Format-output -Text "Unable to find the DRS and SDRS configuration files, No action will be take on these clusters." -Level "INFO" -Phase "Querying DRS and SDRS config"
          }
       }
     } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Capturing settings."
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "Error" -Phase "Capturing settings."
     }
     #check 7 : getting and setting storageIOControlEnabled
     $ds1iocontrol = $false
     $ds2iocontrol = $false
     try {
       if($checkCompleted -lt 7){
          #$dsCluster = Get-DatastoreCluster -datastore $DatastoreName
          $msgText = "Changing storageIOControlEnabled to false. It will be reverted to original once operation is complete."          
          $ds1iocontrol=(Get-Datastore -Name $DatastoreName).StorageIOControlEnabled
          $ds2iocontrol=(Get-Datastore -Name $TemporaryDatastore).StorageIOControlEnabled
          $ds1iocontrol | Export-CliXml $variableFolder\ds1iocontrol.xml
          $ds2iocontrol | Export-CliXml $variableFolder\ds2iocontrol.xml
          if ($ds1iocontrol){
             Format-output -Text $msgText -Level "INFO" -Phase "StorageIOControl"
             (Get-Datastore -Name $DatastoreName) | set-datastore -storageIOControlEnabled $false | Out-Null
          }
          if($ds2iocontrol){
               Format-output -Text $msgText -Level "INFO" -Phase "StorageIOControl"
              (Get-Datastore -Name $TemporaryDatastore) | set-datastore -storageIOControlEnabled $false | Out-Null
          }
          $checkCompleted = 7
          $checkCompleted | out-file $checkFile
       } else {
          if(Test-Path $variableFolder\ds1iocontrol.xml){
             $ds1iocontrol = Import-CliXml $variableFolder\ds1iocontrol.xml
          }
          if(Test-Path $variableFolder\ds2iocontrol.xml){
             $ds2iocontrol = Import-CliXml $variableFolder\ds2iocontrol.xml
          }
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "StorageIOControl."
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "Error" -Phase "StorageIOControl"
       Return
    }
    $tmpDs = Get-Datastore -Name $TemporaryDatastore
    #check 8 : getting and setting stuffs related to datastore cluster
    $datastorecluster = Get-DatastoreCluster -Datastore $tmpDs
    $oldAutomationLevel = 0
    $ioloadbalanced = 0
    try {
       if($checkCompleted -lt 8 ) {
         if($datastorecluster){
            $msgText = "Save properties of datastore cluster. It will be reverted to original once operation is complete."
            Format-output -Text $msgText -Level "INFO" -Phase "DRS Cluster"
            $oldAutomationLevel = $datastorecluster.SdrsAutomationLevel
            $ioloadbalanced = $datastorecluster.IOLoadBalanceEnabled
            $oldAutomationLevel | Export-CliXml $variableFolder\oldAutomationLevel.xml
            $ioloadbalanced | Export-CliXml $variableFolder\ioloadbalanced.xml 
            set-datastorecluster -datastorecluster $datastorecluster -sdrsautomationlevel Manual -IOLoadBalanceEnabled $false | Out-Null
          }
          $checkCompleted = 8
          $checkCompleted | out-file $checkFile
       } else {
          if(Test-Path $variableFolder\sdrsCluster.xml){
             $dsClusterExists = Import-CliXml $variableFolder\sdrsCluster.xml
          }
          if($dsClusterExists){
             if(Test-Path $variableFolder\oldAutomationLevel.xml){
                $oldAutomationLevel = Import-CliXml $variableFolder\oldAutomationLevel.xml
             } 
             if(Test-Path $variableFolder\ioloadbalanced.xml){
                $ioloadbalanced = Import-CliXml $variableFolder\ioloadbalanced.xml
             } 
          }  
       }
       
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Moving datastore to same cluster"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option. If problem persists, move both the datastores to same cluster manually and then try again." -Level "Error" -Phase "Moving datastore to same cluster"
       Return
    }

    # Getting list of VMs present on datastore to migrate.
    $vmList = @()

    #check 9 : Move VMs across datastores
    try {
       if($checkCompleted -lt 9){
          # Getting list of VMs present on datastore to migrate.
          $vms = Get-Datastore $DatastoreName | Get-VM
          foreach($eachVM in $vms ){
            $vmList += $eachVM.Name 
          }
          if($vmList.Count -gt 0) {
             Format-output -Text "Moving list of VMs to temporary datastore." -Level "INFO" -Phase "Preparation"
             Format-output -Text "$vmList" -Level "INFO" -Phase "Preparation"
             $RelocTaskList = Concurrent-SvMotion -session $Server -Source $Datastore -VM $vmList -Destination $TemporaryDatastore -ParallelTasks 2 
             foreach($eachTask in $RelocTaskList){
                if($eachTask["State"] -ne "Success"){ 
                   Format-output -Text "VM failed to Migrate try running the commandlet again with -Resume option." -Level "Error" -Phase "Preperation"
                   Return
                   }
             }
             # if there are any active VMs left , throw error
             $vms = Get-Datastore $DatastoreName | Get-VM
             if($vms -ne $null){ 
                $vswapItems = Get-DatastoreItems -Datastore $DatastoreName -Recurse -fileType $vswap
                if($vswapItems){
                   $msgText1 = "There are still active .vswp :$vswapItems files in $DatastoreName, which can't be migrated "
                   $msgText2 = "Please move these files to other datastore then try again with -Resume option "
                   Format-output -Text "$msgText1, $msgText2"  -Level "ERROR" -Phase "Migraton"
                   Return
                }
                Return
             }            
          } else {
             Format-output -Text "No VirtualMachine is running from $DatastoreName" -Level "INFO" -Phase "Preperation"
          }
          $checkCompleted = 9
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Moving Virtual Machines"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option. If problem persists, move all the VMs from $DatastoreName to $TemporaryDatastore manually and then try again." -Level "Error" -Phase "Moving Virtual Machines"
       Return
    }
    $tagList = $null
    #check 10 : Datastore Tag
    if($checkCompleted -lt 10) {
       # Save Tags attached to the Source Datastore
       $msgText = "Getting list of tags assigned to datastore. These tags will be applied to final VMFS 6 datastore."
       try{
         $tagList = Get-TagAssignment -Entity $DatastoreName | Select -ExpandProperty Tag
         if($tagList) { 
           Format-output -Text $msgText -Level "INFO" -Phase "Datastore Tagging"
           $tagList | Export-CliXml $variableFolder\TagList.xml
         }
       } catch {
          $errName = $_.Exception.GetType().FullName
          $errMsg = $_.Exception.Message
          Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Datastore Tagging"
          Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "Error" -Phase "Datastore Tagging"
          Return
       } 
       $checkCompleted = 10
       $checkCompleted | out-file $checkFile
    }
    
    #check 11 : move orphaned data to temporary datastore
    $SrcTemplateMap = @{}
    if($checkCompleted -lt 11) {
       try{
          $vswap = ".vswp"
          $snapShotDelta = "-delta.vmdk"
          $vswapItems = Get-DatastoreItems -Datastore $DatastoreName -Recurse -fileType $vswap
          $snapShotDeltaItems = Get-DatastoreItems -Datastore $DatastoreName -Recurse -fileType $snapShotDelta
          if($vswapItems -or $snapShotDeltaItems ){
             $msgText1 = "SnapShot delta disks:$snapShotDeltaItems (or) .vswp :$vswapItems files can't be moved "
             $msgText2 = "Please move these files to other datastore then try again with -Resume option "
             Format-output -Text "$msgText1, $msgText2"  -Level "ERROR" -Phase "Copying Orphaned Items"
             Format-output -Text "SnapShot delta disks:$snapShotDeltaItems (or) .vswp :$vswapItems" -Level "ERROR" -Phase "Copying Orphaned data"
             Return
          }

          $templates = Get-Template -Datastore $DatastoreName
          #Cache template VM DS PathName and respective Host
          if($Resume -and (Test-Path $variableFolder\SrcTemplateMap.xml)){
            $SrcTemplateMap = Import-Clixml $variableFolder\SrcTemplateMap.xml
          }
          foreach( $eachtemplate in $templates){                       
              $hostId=$eachTemplate.HostId
              $hostRef = Get-VMHost -Id $hostId
              $templateVmPath = $eachTemplate.ExtensionData.Config.Files.VmPathName
              $SrcTemplateMap[$templateVmPath] = $hostRef.Name
              Remove-Template  $eachtemplate
              Format-output -Text "Template $eachtemplate unregistered from host $hostRef" -Level "INFO" -Phase "Copying Orphaned data"
              $SrcTemplateMap | Export-CliXml $variableFolder\SrcTemplateMap.xml 
          }  
       } catch [Exception] {
          $errName = $_.Exception.GetType().FullName
          $errMsg = $_.Exception.Message
          Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Copying orphaned data"
          Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option. If problem persists, move all the orphaned data from $DatastoreName to $TemporaryDatastore manually and then try again." -Level "ERROR" -Phase "Copying orphaned data."
          Return
       }
       $dsItems = Get-DatastoreItems -Datastore $DatastoreName
       if( ($dsItems -ne $null) -and ($dsItems.Count  -gt 0) ) {
          #Copy all the orphaned items
          Format-output -Text "copying Orphaned items to $TemporaryDatastore" -Level "INFO" -Phase "Copying Orphaned data"
          $result = Copy-DatastoreItems -SourceDatastore $DatastoreName -DestinationDatastore $TemporaryDatastore
          if( !$result ){
             Format-output -Text "Try again with -Resume option" -Level "ERROR" -Phase "Copying orphaned data"
             Return
          }
       }
       $checkCompleted = 11
       $checkCompleted | out-file $checkFile
    }

    $hostConnected = @()
    $LunCanonical = @()
    #check 12 : Unmount datastore
    if($checkCompleted -lt 12) {
       $msgText = "Unmounting datastore from all Hosts"
       Format-output -Text $msgText -Level "INFO" -Phase "Unmount Datastore"
       try {
          $hostConnected = Get-VMHost -Datastore $DatastoreName
          $LunCanonical = Get-ScsiLun -Datastore $DatastoreName | select -ExpandProperty CanonicalName |select -Unique
          #ExportCLI
          $hostConnected  | Export-CliXml $variableFolder\srcHosts.xml
          $LunCanonical   | Export-CliXml $variableFolder\srcLunCanonical.xml
          #Unmount the Source datastore from all the host
          Format-output -Text "Unmounting datastore $DSName..." -Level "INFO" -Phase "Unmount Datastore"
          Unmount-Datastore $DatastoreName     
       } catch [Exception] {
          $errName = $_.Exception.GetType().FullName
          $errMsg = $_.Exception.Message
          Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Unmount Datastore"
          Format-output -Text "Caught the exception while unmounting the datastore. Try again with -Resume option." -Level "ERROR" -Phase "Unmount Datastore"
          Return
       }
       $checkCompleted = 12
       $checkCompleted | out-file $checkFile
    }

    #check 13 : delete datastore
    #Get the Lun

    if($checkCompleted -lt 13) {
       $msgText = "Deleting and recreating VMFS-6 Filesystem."
       Format-output -Text $msgText -Level "INFO" -Phase "Delete Datastore"
       try {
          #Delete the Source datastore from all the host
          Format-output -Text "Deleting datastore $DSName from hosts..." -Level "INFO" -Phase "Delete Datastore"
          Delete-Datastore $DatastoreName
          
       } catch [Exception] {
          $errName = $_.Exception.GetType().FullName
          $errMsg = $_.Exception.Message
          Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Delete Datastore"
          Format-output -Text "Caught the exception while deleting the datastore. Try again with -Resume option." -Level "ERROR" -Phase "Delete Datastore"
          Return
       }
       $checkCompleted = 13
       $checkCompleted | out-file $checkFile
    }

    #check 14 : Create datastore and create new one with VMFS 6
    #Get the Lun

    if($checkCompleted -lt 14) {
       $msgText = " Creating VMFS-6 Filesystem"
       Format-output -Text $msgText -Level "INFO" -Phase "Create VMFS-6"
       try {
          if($Resume){
            #Read $host $luncan
            $hostConnected = Import-CliXml $variableFolder\srcHosts.xml
            $LunCanonical  = Import-CliXml $variableFolder\srcLunCanonical.xml
          }  
          Format-output -Text "Creating Datastore..." -Level "INFO" -Phase "Datastore Create"
          Create-Datastore -LunCanonical $LunCanonical -hostConnected $hostConnected    
       } catch [Exception] {
          $errName = $_.Exception.GetType().FullName
          $errMsg = $_.Exception.Message
          Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Datastore Create"
          Format-output -Text "Caught the exception creating new datastore. Try again with -Resume option." -Level "ERROR" -Phase "Datastore Create"
          Return
       }
       $checkCompleted = 14
       $checkCompleted | out-file $checkFile       
    }

    #check 15 : move the created datastore to cluster
    #Move Ds to its respective cluster
    try {
       $msgText = "Moving newly created datastore to its original datastore cluster."
       if($checkCompleted -lt 15) {
         if($Resume -and (Test-Path $variableFolder\sdrsCluster.xml)){
             $datastorecluster = Import-CliXml $variableFolder\sdrsCluster.xml
          }
          if($datastorecluster){
             Format-output -Text $msgText -Level "INFO" -Phase "SDRS Cluster"
             $datastoreObj = get-datastore $DatastoreName
             Move-Datastore $datastoreObj -Destination $datastorecluster | Out-Null
          }  
          $checkCompleted = 15
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Moving datastore"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option. If problem persists, move the newly created datastore to the same cluster as $TemporaryDatastore" -Level "Error" -Phase "Moving datastore."
       Return
    }
  
    Format-output -Text "Entering restoration phase.." -Level "INFO" -Phase "Restoring VMs"
    # Getting list of VMs present on temporary datastore.
    $vmList = @()
    $dsArray = @()
    $vms = Get-Datastore $TemporaryDatastore | Get-VM
    foreach($eachVM in $vms ){
         $vmList += $eachVM.Name 
    }

    # check 16 : move the vms back to original datastore.
    try {
       $msgText = "Moving VMs back to original datastore, if present"       
       if($checkCompleted -lt 16) {
          Format-output -Text $msgText -Level "INFO" -Phase "Migration"
          if($vmList.Count -gt 0) {
             $RelocTaskList = Concurrent-SvMotion -session $Server -Source $TemporaryDatastore -VM $vmList -Destination $DatastoreName -ParallelTasks 2
             foreach($eachTask in $RelocTaskList){
                if($eachTask["State"] -ne "Success"){ 
                   Format-output -Text "VM failed to Migrate try running the commandlet again with -Resume option." -Level "Error" -Phase "Migration"
                   Return
                }
             }
          }
          # if there are any active VMs left , throw error
          $vms = Get-Datastore $TemporaryDatastore | Get-VM
          if($vms -ne $null){ 
             Format-output -Text "VM(s)-$vms still left in Datastore $TemporaryDatastore,Try w/ Resume again" -Level "Error" -Phase "Migraton"
             Return
          }
          $checkCompleted = 16
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Moving Virtual Machines"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option. If problem persists, move all the VMs from $TemporaryDataStore to $DatastoreName manually and then try again." -Level "Error" -Phase "Moving Virtual Machines"
       Return
    }
    #Attaching tags back to original datastore
    if($checkCompleted -lt 17) {
       #Attach Tags to the datastore
       if($Resume -and (Test-Path $variableFolder\TagList.xml)) {
            $tagList = Import-CliXml $variableFolder\TagList.xml
       }
       
       $msgText = "Attaching Tags back to original datastore."
       try {
          foreach ( $tag in $tagList) {
            $tagObj = $null
            $tagObj = Get-Tag -Name $tag.Name -Category $tag.Category.Name
            $msgText = "Adding back the Tags to Datastore :$DatastoreName"
            Format-output -Text $msgText -Level "INFO" -Phase "Datastore Tags"
            $newTag = New-TagAssignment -Tag $tagObj -Entity $DatastoreName
          }
          
       } catch {
          $errName = $_.Exception.GetType().FullName
          $errMsg = $_.Exception.Message
          Format-output -Text "$errName, $errMsg" -Level "Error" -Phase "Datastore Tag"
          Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "Error" -Phase "Datastore Tag"
          Return
       }
       $checkCompleted = 17
       $checkCompleted | out-file $checkFile
    }
    # check 17 : move the orphaned data back to original datastore.
    try {
       $msgText = "Moving orphaned data back to original datastore, if present."
       $dsItems = Get-DatastoreItems -Datastore $TemporaryDatastore 
       if($checkCompleted -lt 18) {
          Format-output -Text $msgText -Level "INFO" -Phase "Restoring Orphan data"
          if(($dsItems -ne $null) -and ($dsItems.Count) -gt 0 ) {
             Format-output -Text "Copying Orphaned items to $DatastoreName" -Level "INFO" -Phase "Copying Orphaned Items"
             $result = Copy-DatastoreItems -SourceDatastore $TemporaryDatastore -DestinationDatastore $DatastoreName
             if( !$result ){
                Format-output -Text "Try again with -Resume option" -Level "ERROR" -Phase "Copying orphaned data"
                Return
             }
             $tempds = get-datastore -Name $TemporaryDatastore
             new-psdrive -Location $tempds -Name tempds -PSProvider VimDatastore -Root "\" | Out-Null
             # Remove contents from temporary Datastore
             remove-item tempds:\* -Recurse
          } 

          # Register templateVM(s) back in the respective hosts
          if($Resume -and (Test-Path $variableFolder\SrcTemplateMap.xml)){
             $SrcTemplateMap = Import-Clixml $variableFolder\SrcTemplateMap.xml
          }
          foreach( $templatePath in $SrcTemplateMap.Keys){            
             try {
               $register = New-Template �VMHost $SrcTemplateMap[$templatePath] -TemplateFilePath $templatePath
               $esxHost= $SrcTemplateMap[$templatePath]
               Format-output -Text "Template VM registered in host $esxHost " -Level "INFO" -Phase "Template Register"
             } catch{
               $errName = $_.Exception.GetType().FullName
               if( $errName -match  "AlreadyExists"){
                   Format-output -Text "$templatePath :Template already registered" -Level "INFO" -Phase "Template Register"
               } else {
                   throw  $_.Exception
               }
             }
           }     
       }
       $checkCompleted = 18
       $ceckCompleted | out-file $checkFile
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Moving orphaned data"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option. If problem persists, move all the orphaned data from $TemporaryDataStore to $DatastoreName manually and then try again." -Level "ERROR" -Phase "Moving orphaned data."
       Return
    }

    #check 18 : Update SRDS properties of cluster.-SDRS
    try {
       if($checkCompleted -lt 19){
          if($Resume -and (Test-Path $variableFolder\sdrsCluster.xml)){
             $datastorecluster = Import-CliXml $variableFolder\sdrsCluster.xml
          }
          if($datastorecluster) {
             $msgText = "Setting datastore-cluster properties to previous State."
             Format-output -Text "$msgText : $oldAutomationLevel" -Level "INFO" -Phase "SDRS Cluster"
             if($Resume){
                $oldAutomationLevel = Import-CliXml $variableFolder\oldAutomationLevel.xml
                $ioloadbalanced = Import-CliXml $variableFolder\ioloadbalanced.xml
             }
             set-datastorecluster -datastorecluster $datastorecluster -sdrsautomationlevel $oldAutomationLevel -IOLoadBalanceEnabled $ioloadbalanced | Out-Null
          }
          $checkCompleted = 19
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Reverting to original datastore settings"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "ERROR" -Phase "Reverting to original datastore settings."
       Return
    }
    
    # check 20 : set datastore storageIOControlEnabled to previous value.
    try { 
       if($checkCompleted -lt 20) {
          $msgText = "Setting datastore properties to previous State."
          if($Resume -and (Test-Path $variableFolder\ds1iocontrol.xml)){$ds1iocontrol = Import-CliXml $variableFolder\ds1iocontrol.xml}
          if($Resume -and (Test-Path $variableFolder\ds2iocontrol.xml)){$ds2iocontrol = Import-CliXml $variableFolder\ds2iocontrol.xml}
          Format-output -Text $msgText -Level "INFO" -Phase "Datastore Settings"
          (Get-Datastore -Name $DatastoreName) | set-datastore -storageIOControlEnabled $ds1iocontrol | Out-Null
          (Get-Datastore -Name $TemporaryDatastore) | set-datastore -storageIOControlEnable $ds2iocontrol | Out-Null

          $checkCompleted = 20
          $checkCompleted | out-file $checkFile
       }
       # check 21 : set cluster DrsAutomationLevel to previous value. -DRS
       if($checkCompleted -lt 21) {
          $msgText = "Setting cluster properties to previous State."
          Format-output -Text $msgText -Level "INFO" -Phase "DRS Cluster"
          foreach($clus in $clusters) {
             if($clus.DrsEnabled){
               if($Resume -and (Test-Path $variableFolder\drsMap.xml)){ $drsMap = Import-Clixml $variableFolder\drsMap.xml}
               Set-Cluster -Cluster $clus -DrsAutomationLevel $drsMap[$clus.Name] -confirm:$false | Out-Null
             }
          }
          $checkCompleted = 21
          $checkCompleted | out-file $checkFile
       }
    } catch {
       $errName = $_.Exception.GetType().FullName
       $errMsg = $_.Exception.Message
       Format-output -Text "$errName, $errMsg" -Level "ERROR" -Phase "Reverting to original datastore and datastore cluster settings"
       Format-output -Text "Unable to proceed, try running the commandlet again with -Resume option." -Level "ERROR" -Phase "Reverting to original datastore and datastore-cluster settings."
       Return
    }
    Format-output -Text "Datastore upgraded successfully" -Level "INFO" -Phase "Upgrade successful"
    Format-output -Text "Zip the log directory " -Level "INFO" -Phase "Upgrade successful"
    Zip-Logs -logdir $variableFolder
    Remove-Item $variableFolder -recurse
    Remove-Item $checkFile
    $errorActionPreference = 'continue'
}

<#
 
.SYNOPSIS
This is a Powershell commandlet to upgrade VMFS5 datastore to VMFS6 Datastore
 
.DESCRIPTION
The commandlet to upgrade VMFS5 or VMFS3 datastore to VMFS6 Datastore. The Steps involved in the Upgrade are as follows
   1) Identify the VMFS5 or VMFS3 Datastore which needs to be at VMFS6 Version. Lets call it Target_VmfsDs
   2) Itentify a Temporary Datastore VMFS5 datastore. Lets call it TempDs
   3) Migrate (storage vMotion) all the files, VMs and orphaned vmdks present in the Target_VmfsDs to the TempDs.
   4) Evacuate the Target_VmfsDs completely.
   5) Delete the Target_VmfsDs and recreate a VMFS6 datastore in place of it. Lets call it New_Vmfs6Ds
   6) Move back all the VMs, files and orphaned vmdks from TempDsto New_Vmfs6Ds.
   7) The commandlet would keep a tab of all the Live VM migrations, in case of any migration failures, the commandlet will Roll back the data to the Source Datastore to preserve data consistency.
 
 
.EXAMPLE
.\UpgradeVmfs5ToVmfs6.ps1 -vcHost "10.161.246.25" -vcUser "Administrator@vsphere.local" -DatastoreList "sharedVmfs-3" -TemporaryDatastore "TempDSvmfs6"
 
.NOTES
Put some notes here.
 
.LINK
http://url.vmware.com/f2fc
 
#> 
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