Optimize-VirtualDisk

2025.7.0

Private/ProcessVirtualMachine.ps1

                                function ProcessVirtualMachine {

    [CmdletBinding(DefaultParameterSetName = "VMName", SupportsShouldProcess)]

    [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSShouldProcess", "", Justification = "-WhatIf support is still properly implemented via ProcessVirtualDiskPath without ProcessVirtualMachine using ShouldProcess().")]

    param (

        [Parameter(Mandatory, ParameterSetName = "VMName")]

        [string]

        $VMName,

        [Parameter(Mandatory, ParameterSetName = "VM")]

        [ValidateNotNull()]

        [Microsoft.HyperV.PowerShell.VirtualMachine]

        $VM,

        [Parameter()]

        [switch]

        $Shutdown

    )

    if ($PSBoundParameters.ContainsKey("VMName")) {

        $targetVM = Get-VM -VMName $VMName -ErrorAction SilentlyContinue -ErrorVariable err

        if ($err) {

            Write-Error "Failed to find VM with the name '$VMName' via Get-VM. The error was: $err"

            return

        } elseif (!$targetVM) {

            Write-Warning "Failed to find a valid VM object from Get-VM with the name '$VMName'."

            return

        }

    } elseif ($PSBoundParameters.ContainsKey("VM")) {

        $targetVM = $VM

    } else {

        # Sanity check.

        Write-Error "Missing both VMName and VM parameters in ProcessVirtualMachine! Please report this."

        return

    }

    if ($targetVM.ParentSnapshotId) {

        Write-Error "Failed to process VM '$($targetVM.Name)': a ParentSnapshotId was found. Please merge any snapshots before running Optimize-VirtualDisk on the VM."

        return

    }

    $hardDiskDrives = Get-VMHardDiskDrive -VM $targetVM -ErrorAction SilentlyContinue -ErrorVariable err

    if ($err) {

        Write-Error "Failed to obtain a list of VM hard disk drives from VM '$($targetVM.Name)'. The error was: $err"

        return

    }

    foreach ($hardDiskDrive in $hardDiskDrives) {

        if ($hardDiskDrive.Path -like "*.avhdx") {

            Write-Error "Failed to process VM '$($targetVM.Name)': determined a snapshots exists with VM hard disk drive '$($hardDiskDrive.Path)'. Please merge any snapshots before running Optimize-VirtualDisk on the VM."

            return

        }

    }

    try {

        $restartVM = $false

        $whatIfVmShutdown = $false

        if ($Shutdown -and $targetVM.State -eq "Running") {

            Write-Verbose "Shutting down VM '$($targetVM.Name)' so that it can be optimized."

            Stop-VM -VM $targetVM -ErrorAction SilentlyContinue -ErrorVariable err -WhatIf:$WhatIfPreference

            if ($err) {

                Write-Error "Failed to stop VM '$($targetVM.Name)' via Stop-VM. The error was: $err"

                return

            }

            $whatIfVmShutdown = $WhatIfPreference

            $restartVM = $true

        }

        # Skip when we've "stopped" the VM in -WhatIf mode.

        # We can't actually execute Stop-VM and see the result, we just proceed under the assumption Stop-VM will work.

        if (!$whatIfVmShutdown -and $targetVM.State -ne "Off") {

            Write-Error "Failed to process VM '$($targetVM.Name)': the VM was not turned off. Please manually turn the VM off$(if (!$Shutdown) { " or use the -Shutdown parameter to attempt to automatically turn the VM off and restart it when optimization is complete" })."

            return

        }

        foreach ($hardDiskDrive in $hardDiskDrives) {

            Write-Verbose "Optimizing VM hard disk drive '$($hardDiskDrive.Path)' from VM '$($targetVM.Name)'..."

            ProcessVirtualDiskPath -LiteralPath $hardDiskDrive.Path -WhatIf:$WhatIfPreference

        }

    } finally {

        if ($restartVM) {

            Write-Verbose "Restarting VM '$($targetVM.Name)' since it was shut down earlier."

            Start-VM -VM $targetVM -ErrorAction SilentlyContinue -ErrorVariable err -WhatIf:$WhatIfPreference

            if ($err) {

                Write-Warning "Failed to restart VM '$($targetVM.Name)' via Start-VM after it was shut down earlier. The VM will need to be restarted manually. The error was: $err"

            }

        }

    }

}

# Copyright (c) 2024 AJ Tek Corporation. All Rights Reserved.

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