This script uses sdelete to zero-out all disks of a Windows VM. Afterwards, the VM is moved between datastores to reclaim zeroed space.
| <# | |
| .SYNOPSIS | |
| No parameters needed. Just execute the script. | |
| .DESCRIPTION | |
| This script uses sdelete to zero-out all disks of a Windows VM. Afterwards, the VM | |
| is moved between datastores to reclaim zeroed space. | |
| History | |
| v1.3: Redesign. | |
| v1.2: Added function to zero-out all disks in a guest VM. WMI is used to fetch a | |
| list with all local disk (drivetype = 3). | |
| v1.1: The script now skips VMs with Snapshots and ZeroedThick or EagerZeroedThick | |
| disks | |
| v1.0: Initial version | |
| .EXAMPLE | |
| Reclaim-ThinVMDK | |
| .NOTES | |
| Author: Patrick Terlisten, patrick@blazilla.de, Twitter @PTerlisten | |
| This script is provided “AS IS” with no warranty expressed or implied. Run at your own risk. | |
| This work is licensed under a Creative Commons Attribution NonCommercial ShareAlike 4.0 | |
| International License (https://creativecommons.org/licenses/by-nc-sa/4.0/). | |
| .LINK | |
| https://www.vcloudnine.de | |
| #> | |
| ### Please change the content of the variables for $PathToSDelete, $VIServer | |
| ### $CredFile, $Username, $DstDS, $DstDSHost and $ClusterName according to your environment. | |
| # Path to SDelete and command to exectue. Please make sure that you use the latest version 1.61! | |
| $PathToSDelete ='C:\Windows\sdelete.exe' | |
| $SDeleteCommandLine = 'sdelete -q -z' | |
| # vCenter Server | |
| # I recommend to create a new VICredentialStoreItem and use this to connect to the vCenter Server | |
| $VIServer = 'vcenter.domain.tld' | |
| # To create an encrypted password file, execute the following command | |
| # Read-Host -AsSecureString | ConvertFrom-SecureString | Out-File securestring.txt | |
| # Fill $CredFile with path to securesting.txt. Please make sure that you create the | |
| # $CredFile with the user that is running this script. | |
| $CredFile = 'C:\PATH\TO\securestring.txt' | |
| $Username = 'DOMAIN\USERNAME' | |
| $Password = (Get-Content $CredFile | ConvertTo-SecureString) | |
| $Cred = New-Object System.Management.Automation.PSCredential ($Username, $Password) | |
| # Set destination datastore. Can be a local or shared VMFS datastore. | |
| # If a local datastore is used, $DstDSHost must be set. In case of a shared datastore | |
| # set $DstDSHost to $null. | |
| $DstDS = 'DATASTORE-NAME' | |
| $DstDSHost = 'esx-host.domain.tld' | |
| #$DstDSHost = $null | |
| # Name of vSphere Cluster | |
| $ClusterName = 'VSPHERE-CLUSTER' | |
| # Connect to vCenter Server. VICredentialStoreItem is used for connection. Otherwise change | |
| # parameters and add -User -Password | |
| Write-Host "`n" | |
| Write-Host "Connecting to vCenter Server $VIServer" -ForegroundColor Green | |
| Connect-VIServer $VIServer | Out-Null | |
| # Build an array with all Windows VMs | |
| $SrcVM = (Get-Cluster $ClusterName | Get-VM | Where-Object { $_.Guest.OSFullName -like '*Windows*' }) | |
| # Debug: Run only for specific VM | |
| #$SrcVM = (Get-VM | Where { $_.Name -like "vmname" }) | |
| # For every object in the array... | |
| $SrcVM | ForEach-Object { | |
| # Tell me what you're doing.. | |
| Write-Host "`n" | |
| Write-Host "### Processing VM $_ ###" -ForegroundColor Green | |
| # Check for ZeroedThick and EagerZeroedThick disks | |
| $DiskFormat = ((Get-HardDisk $_).StorageFormat | Select-Object -uniq) | |
| If ( $DiskFormat -like '*Thick*' ) { | |
| Write-Host "`n" | |
| Write-Host "ERROR: At least one disk on VM $_ is of type ZeroedThick or EagerZeroedThick. Skipping this VM" -ForegroundColor Red | |
| } | |
| else { | |
| # Check for Snapshots | |
| $NumberOfSnaps = (Get-VM $_ | Get-Snapshot) | |
| If ($NumberOfSnaps.Count -gt 0) { | |
| Write-Host "`n" | |
| Write-Host "ERROR: VM $_ has at least one active snaphost. Skipping this VM" -ForegroundColor Red | |
| } | |
| elseif ($NumberOfSnaps.Count -eq 0) { | |
| # Set source datastore | |
| $SrcDS = ((Get-HardDisk $_).Filename).Split('[')[1].Split(']')[0] | |
| # Set source host | |
| $SrcHost = (Get-VM $_ | Get-VMHost).name | |
| # Initiate new PSSession | |
| $RemotePSSession = New-PSSession -ComputerName $_.Guest.HostName -Credential $Cred | |
| # Tell me what you're doing... | |
| Write-Host "Starting to zero-out volumes on VM $_. Calling Invoke-Command to run SDelete. To be honest: This can take some time... Check the Task Manager inside the VM for a running sdelete.exe process." -ForegroundColor Green | |
| # Test if SDelete exist. If yes, zero-out all disks | |
| $ExitCodeInvokeCommand = Invoke-Command -Session $RemotePSSession -ArgumentList $PathToSDelete, $SDeleteCommandLine -ScriptBlock { | |
| # This is the sdelete commandline which is used in the GetWmiObject invocation | |
| $CommandlineInGuest = $args[1] | |
| # Test for SDelete and run SDelete | |
| If (Test-Path $args[0]) { | |
| Get-WmiObject win32_logicaldisk| Where-Object { $_.drivetype -eq 3 } | ForEach-Object { cmd.exe /c $CommandlineInGuest $_.name } | Out-Null | |
| $ErrorCode = 0 | |
| } Else { | |
| $ErrorCode = 1 | |
| }; $ErrorCode | |
| } | |
| # Remove PSSession | |
| Remove-PSSession $_.Guest.HostName | |
| # If SDelete was found and zero-out has completed, move VM to $DstDS and then back to $SrcDS and $SrcHost | |
| If ($ExitCodeInvokeCommand -eq 0) { | |
| # Move-VM is used to SvMotion the VM to the destination datastore using the original DiskStorageFormat (should be always thin) | |
| # If a local datastore is used as destination, the VM is moved to the host with the local datastore an then later back to its source host | |
| If ($DstDSHost -eq $Null) { | |
| Write-Host "Exitcode of Invoke-Command was $ExitCodeInvokeCommand. Everything seems to be fine. Moving VM $_ to $DstDS." -ForegroundColor Green | |
| Move-VM -VM $_ -Datastore $DstDS -DiskStorageFormat $DiskFormat | Out-Null | |
| } Else { | |
| Write-Host "Exitcode of Invoke-Command was $ExitCodeInvokeCommand. Everything seems to be fine. Moving VM $_ to $DstDS on $DstDSHost." -ForegroundColor Green | |
| Move-VM -VM $_ -Destination $DstDSHost -Datastore $DstDS -DiskStorageFormat $DiskFormat | Out-Null | |
| } | |
| # Move-VM is used to SvMotion the VM back to its original datastore using the original DiskStorageFormat | |
| Write-Host "Moving VM back to $SrcDS on $SrcHost and ." -ForegroundColor Green | |
| Move-VM -VM $_ -Destination $SrcHost -Datastore $SrcDS -DiskStorageFormat $DiskFormat | Out-Null | |
| } | |
| # If $ExitCodeInvokeCommand -eq 1, sdelete.exe wasn't found. Skip this VM. | |
| elseif ( $ExitCodeInvokeCommand -eq 1 ) { | |
| Write-Host "`n" | |
| Write-Host 'SDelete was not found. Skipping this VM' -ForegroundColor Red | |
| } | |
| } | |
| } | |
| } | |
| # Disconnect from vCenter Server | |
| Write-Host "`n" | |
| Write-Host "Disconnecting from vCenter Server $VIServer" -ForegroundColor Green | |
| Disconnect-VIServer $VIServer -Force -Confirm:$false | Out-Null |
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