DSCResources/DSC_SqlMemory/DSC_SqlMemory.psm1
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$script:sqlServerDscHelperModulePath = Join-Path -Path $PSScriptRoot -ChildPath '..\..\Modules\SqlServerDsc.Common' $script:resourceHelperModulePath = Join-Path -Path $PSScriptRoot -ChildPath '..\..\Modules\DscResource.Common' Import-Module -Name $script:sqlServerDscHelperModulePath Import-Module -Name $script:resourceHelperModulePath $script:localizedData = Get-LocalizedData -DefaultUICulture 'en-US' <# .SYNOPSIS This function gets the value of the min and max memory server configuration option. .PARAMETER ServerName The host name of the SQL Server to be configured. .PARAMETER InstanceName The name of the SQL instance to be configured. #> function Get-TargetResource { [CmdletBinding()] [OutputType([System.Collections.Hashtable])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $InstanceName, [Parameter()] [ValidateNotNullOrEmpty()] [System.String] $ServerName = $env:COMPUTERNAME ) Write-Verbose -Message ( $script:localizedData.GetMemoryValues -f $InstanceName ) $sqlServerObject = Connect-SQL -ServerName $ServerName -InstanceName $InstanceName if ($sqlServerObject) { $minMemory = $sqlServerObject.Configuration.MinServerMemory.ConfigValue $maxMemory = $sqlServerObject.Configuration.MaxServerMemory.ConfigValue # Is this node actively hosting the SQL instance? $isActiveNode = Test-ActiveNode -ServerObject $sqlServerObject } $returnValue = @{ InstanceName = $InstanceName ServerName = $ServerName MinMemory = $minMemory MaxMemory = $maxMemory IsActiveNode = $isActiveNode } $returnValue } <# .SYNOPSIS This function sets the value for the min and max memory server configuration option. .PARAMETER ServerName The host name of the SQL Server to be configured. .PARAMETER InstanceName The name of the SQL instance to be configured. .PARAMETER Ensure When set to 'Present' then min and max memory will be set to either the value in parameter MinMemory and MaxMemory or dynamically configured when parameter DynamicAlloc is set to $true. When set to 'Absent' min and max memory will be set to default values. .PARAMETER DynamicAlloc If set to $true then max memory will be dynamically configured. When this is set parameter is set to $true, the parameter MaxMemory must be set to $null or not be configured. .PARAMETER MinMemory This is the minimum amount of memory, in MB, in the buffer pool used by the instance of SQL Server. .PARAMETER MaxMemory This is the maximum amount of memory, in MB, in the buffer pool used by the instance of SQL Server. .PARAMETER ProcessOnlyOnActiveNode Specifies that the resource will only determine if a change is needed if the target node is the active host of the SQL Server instance. Not used in Set-TargetResource. #> function Set-TargetResource { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $InstanceName, [Parameter()] [ValidateNotNullOrEmpty()] [System.String] $ServerName = $env:COMPUTERNAME, [Parameter()] [ValidateSet('Present', 'Absent')] [System.String] $Ensure = 'Present', [Parameter()] [System.Boolean] $DynamicAlloc = $false, [Parameter()] [System.Int32] $MinMemory, [Parameter()] [System.Int32] $MaxMemory, [Parameter()] [System.Boolean] $ProcessOnlyOnActiveNode ) Write-Verbose -Message ( $script:localizedData.SetNewValues -f $InstanceName ) $sqlServerObject = Connect-SQL -ServerName $ServerName -InstanceName $InstanceName if ($sqlServerObject) { switch ($Ensure) { 'Present' { if ($DynamicAlloc) { if ($MaxMemory) { $errorMessage = $script:localizedData.MaxMemoryParamMustBeNull New-InvalidArgumentException -ArgumentName 'MaxMemory' -Message $errorMessage } $MaxMemory = Get-SqlDscDynamicMaxMemory Write-Verbose -Message ( $script:localizedData.DynamicMaxMemoryValue -f $MaxMemory ) } else { if (-not $MaxMemory) { $errorMessage = $script:localizedData.MaxMemoryParamMustNotBeNull New-InvalidArgumentException -ArgumentName 'MaxMemory' -Message $errorMessage } } Write-Verbose -Message ( $script:localizedData.MaximumMemoryLimited -f $InstanceName, $MaxMemory ) $sqlServerObject.Configuration.MaxServerMemory.ConfigValue = $MaxMemory if ($MinMemory) { $sqlServerObject.Configuration.MinServerMemory.ConfigValue = $MinMemory Write-Verbose -Message ( $script:localizedData.MinimumMemoryLimited -f $InstanceName, $MinMemory ) } } 'Absent' { $defaultMaxMemory = 2147483647 $defaultMinMemory = 0 Write-Verbose -Message ( $script:localizedData.DefaultValues -f $defaultMinMemory, $defaultMaxMemory ) $sqlServerObject.Configuration.MaxServerMemory.ConfigValue = $defaultMaxMemory $sqlServerObject.Configuration.MinServerMemory.ConfigValue = $defaultMinMemory Write-Verbose -Message ( $script:localizedData.ResetDefaultValues -f $InstanceName ) } } try { $sqlServerObject.Alter() } catch { $errorMessage = $script:localizedData.AlterServerMemoryFailed -f $ServerName, $InstanceName New-InvalidOperationException -Message $errorMessage -ErrorRecord $_ } } } <# .SYNOPSIS This function tests the value of the min and max memory server configuration option. .PARAMETER ServerName The host name of the SQL Server to be configured. .PARAMETER InstanceName The name of the SQL instance to be configured. .PARAMETER Ensure When set to 'Present' then min and max memory will be set to either the value in parameter MinMemory and MaxMemory or dynamically configured when parameter DynamicAlloc is set to $true. When set to 'Absent' min and max memory will be set to default values. .PARAMETER DynamicAlloc If set to $true then max memory will be dynamically configured. When this is set parameter is set to $true, the parameter MaxMemory must be set to $null or not be configured. .PARAMETER MinMemory This is the minimum amount of memory, in MB, in the buffer pool used by the instance of SQL Server. .PARAMETER MaxMemory This is the maximum amount of memory, in MB, in the buffer pool used by the instance of SQL Server. .PARAMETER ProcessOnlyOnActiveNode Specifies that the resource will only determine if a change is needed if the target node is the active host of the SQL Server instance. #> function Test-TargetResource { [CmdletBinding()] [OutputType([System.Boolean])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String] $InstanceName, [Parameter()] [ValidateNotNullOrEmpty()] [System.String] $ServerName = $env:COMPUTERNAME, [Parameter()] [ValidateSet("Present", "Absent")] [System.String] $Ensure = 'Present', [Parameter()] [System.Boolean] $DynamicAlloc = $false, [Parameter()] [System.Int32] $MinMemory, [Parameter()] [System.Int32] $MaxMemory, [Parameter()] [System.Boolean] $ProcessOnlyOnActiveNode ) Write-Verbose -Message ( $script:localizedData.EvaluatingMinAndMaxMemory -f $InstanceName ) $getTargetResourceParameters = @{ InstanceName = $InstanceName ServerName = $ServerName } $getTargetResourceResult = Get-TargetResource @getTargetResourceParameters $currentMinMemory = $getTargetResourceResult.MinMemory $currentMaxMemory = $getTargetResourceResult.MaxMemory $isServerMemoryInDesiredState = $true <# If this is supposed to process only the active node, and this is not the active node, don't bother evaluating the test. #> if ($ProcessOnlyOnActiveNode -and -not $getTargetResourceResult.IsActiveNode) { Write-Verbose -Message ( $script:localizedData.NotActiveNode -f $env:COMPUTERNAME, $InstanceName ) return $isServerMemoryInDesiredState } switch ($Ensure) { 'Absent' { if ($currentMaxMemory -ne 2147483647) { Write-Verbose -Message ( $script:localizedData.WrongMaximumMemory -f $currentMaxMemory, '2147483647' ) $isServerMemoryInDesiredState = $false } if ($currentMinMemory -ne 0) { Write-Verbose -Message ( $script:localizedData.WrongMinimumMemory -f $currentMinMemory, '0' ) $isServerMemoryInDesiredState = $false } } 'Present' { if ($DynamicAlloc) { if ($MaxMemory) { $errorMessage = $script:localizedData.MaxMemoryParamMustBeNull New-InvalidArgumentException -ArgumentName 'MaxMemory' -Message $errorMessage } $MaxMemory = Get-SqlDscDynamicMaxMemory Write-Verbose -Message ( $script:localizedData.DynamicMaxMemoryValue -f $MaxMemory ) } else { if (-not $MaxMemory) { $errorMessage = $script:localizedData.MaxMemoryParamMustNotBeNull New-InvalidArgumentException -ArgumentName 'MaxMemory' -Message $errorMessage } } if ($MaxMemory -ne $currentMaxMemory) { Write-Verbose -Message ( $script:localizedData.WrongMaximumMemory -f $currentMaxMemory, $MaxMemory ) $isServerMemoryInDesiredState = $false } if ($MinMemory) { if ($MinMemory -ne $currentMinMemory) { Write-Verbose -Message ( $script:localizedData.WrongMinimumMemory -f $currentMinMemory, $MinMemory ) $isServerMemoryInDesiredState = $false } } } } return $isServerMemoryInDesiredState } <# .SYNOPSIS This cmdlet is used to return the Dynamic MaxMemory of a SQL Instance #> function Get-SqlDscDynamicMaxMemory { try { $physicalMemory = (Get-CimInstance -ClassName Win32_ComputerSystem).TotalPhysicalMemory $physicalMemoryInMegaBytes = [Math]::Round($physicalMemory / 1MB) # Find how much to save for OS: 20% of total ram for under 15GB / 12.5% for over 20GB if ($physicalMemoryInMegaBytes -ge 20480) { $reservedOperatingSystemMemory = [Math]::Round((0.125 * $physicalMemoryInMegaBytes)) } else { $reservedOperatingSystemMemory = [Math]::Round((0.2 * $physicalMemoryInMegaBytes)) } $numberOfCores = (Get-CimInstance -ClassName Win32_Processor | Measure-Object -Property NumberOfCores -Sum).Sum # Get the number of SQL threads. if ($numberOfCores -ge 4) { $numberOfSqlThreads = 256 + ($numberOfCores - 4) * 8 } else { $numberOfSqlThreads = 0 } $operatingSystemArchitecture = (Get-CimInstance -ClassName Win32_OperatingSystem).OSArchitecture # Find threadStackSize 1MB x86/ 2MB x64/ 4MB IA64 if ($operatingSystemArchitecture -eq '32-bit') { $threadStackSize = 1 } elseif ($operatingSystemArchitecture -eq '64-bit') { $threadStackSize = 2 } else { $threadStackSize = 4 } $maxMemory = $physicalMemoryInMegaBytes - $reservedOperatingSystemMemory - ($numberOfSqlThreads * $threadStackSize) - (1024 * [System.Math]::Ceiling($numberOfCores / 4)) } catch { $errorMessage = $script:localizedData.ErrorGetDynamicMaxMemory New-InvalidOperationException -Message $errorMessage -ErrorRecord $_ } $maxMemory } Export-ModuleMember -Function *-TargetResource |