Optimize-VirtualDisk

2025.7.0

Private/OptimizeVirtualDisk.ps1

                                function OptimizeVirtualDisk {

    [CmdletBinding(SupportsShouldProcess)]

    param (

        [Parameter(Mandatory)]

        [string]

        $FilePath

    )

    if (!(TestVHDFileValid $FilePath)) {

        return

    }

    $alreadyMounted = $false

    $dismountRequired = $false

    try {

        Write-Verbose "Getting disk image for VHD '$FilePath'."

        $diskImage = Get-DiskImage -ImagePath $FilePath -ErrorVariable err

        if ($null -eq $diskImage) {

            Write-Error "Failed to obtain disk image for VHD '$FilePath': $err"

            return

        }

        $startingSize = $diskImage.FileSize

        $alreadyMounted = $diskImage.Attached -eq $true

        if (!$alreadyMounted) {

            Write-Verbose "Mounting VHD file '$FilePath'."

            Mount-VHD -Path $FilePath -ErrorVariable err

            if ($err) {

                Write-Error "Failed to mount VHD '$FilePath': $err"

                return

            }

            Write-Verbose "VHD was mounted successfully. Getting disk image from it."

            $dismountRequired = $true

            $diskImage = Get-DiskImage -ImagePath $FilePath -ErrorVariable err

            if ($err) {

                Write-Error "Failed to obtain disk image for VHD '$FilePath' after mounting it. The error was: $err"

                return

            } elseif (!$diskImage) {

                Write-Error "Failed to obtain disk image for VHD '$FilePath' after mounting it."

                return

            }

        }

        if ($null -eq $diskImage.Number) {

            Write-Error "Failed to obtain disk image number for VHD '$FilePath'."

            return

        }

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

        $vhdDisk = $diskImage | Get-Disk -ErrorAction SilentlyContinue -ErrorVariable err

        if ($null -eq $vhdDisk) {

            Write-Error "Failed to obtain disk from disk image for VHD '$FilePath'. The error was: $err"

            return

        } elseif (!$vhdDisk) {

            Write-Error "Failed to obtain disk from disk image for VHD '$FilePath'."

            return

        }

        $vhdPartition = Get-Partition -DiskNumber $vhdDisk.Number -ErrorVariable err

        if ($err) {

            Write-Warning "Failed to obtain partition from disk number $($vhdDisk.Number) for VHD '$FilePath'. The error was: $err"

            return

        } elseif (!$vhdPartition) {

            Write-Warning "Failed to obtain partition from disk number $($vhdDisk.Number) for VHD '$FilePath'."

            return

        }

        $win32Volumes = Get-CimInstance Win32_Volume -Verbose:$false -ErrorAction SilentlyContinue

        try {

            $defragFinishedNormally = $false

            $defragErrorRaised = $false

            #! Be careful adjusting this. If refactoring $partition ensure that all $job.Command.Replace('$partition.DriveLetter', ...) calls are updated as well.

            foreach ($partition in $vhdPartition) {

                if ($partition.DriveLetter -eq [char]0) {

                    Write-Verbose "Skipping partition #$($partition.PartitionNumber) (empty drive letter)."

                    continue

                } elseif ($Script:VALID_VOLUME_LETTERS -notcontains $partition.DriveLetter) {

                    Write-Verbose "Skipping partition #$($partition.PartitionNumber) (invalid drive letter '$($partition.DriveLetter)')."

                    continue

                }

                $targetWin32Volume = $win32Volumes | Where-Object { $_.DeviceID -eq "\\?\Volume$($partition.Guid)\" }

                $volumeLabel = ""

                if ($targetWin32Volume -and ![string]::IsNullOrWhiteSpace($targetWin32Volume.Label)) {

                    $volumeLabel = " (DriveName '$($targetWin32Volume.Label)')"

                }

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

                Write-Verbose "Invoking Optimize-Volume for DriveLetter '$($partition.DriveLetter)'$($volumeLabel) with parameters: -Defrag"

                $job = Optimize-Volume -DriveLetter $partition.DriveLetter -Defrag -ErrorAction Stop -AsJob

                WriteCustomJobProgress -Job $job -Activity $job.Command.Replace('$partition.DriveLetter', "'$($partition.DriveLetter)'$($volumeLabel)")

                Write-Verbose "Invoking Optimize-Volume for DriveLetter '$($partition.DriveLetter)'$($volumeLabel) with parameters: -SlabConsolidate -ReTrim"

                $job = Optimize-Volume -DriveLetter $partition.DriveLetter -SlabConsolidate -ReTrim -ErrorAction Stop -AsJob

                WriteCustomJobProgress -Job $job -Activity $job.Command.Replace('$partition.DriveLetter', "'$($partition.DriveLetter)'$($volumeLabel)")

                Write-Verbose "Invoking Optimize-Volume for DriveLetter '$($partition.DriveLetter)'$($volumeLabel) with parameters: -Defrag"

                $job = Optimize-Volume -DriveLetter $partition.DriveLetter -Defrag -ErrorAction Stop -AsJob

                WriteCustomJobProgress -Job $job -Activity $job.Command.Replace('$partition.DriveLetter', "'$($partition.DriveLetter)'$($volumeLabel)")

                Write-Verbose "Invoking Optimize-Volume for DriveLetter '$($partition.DriveLetter)'$($volumeLabel) with parameters: -SlabConsolidate"

                $job = Optimize-Volume -DriveLetter $partition.DriveLetter -SlabConsolidate -ErrorAction Stop -AsJob

                WriteCustomJobProgress -Job $job -Activity $job.Command.Replace('$partition.DriveLetter', "'$($partition.DriveLetter)'$($volumeLabel)")

            }

            $defragFinishedNormally = $true

        } catch {

            $defragErrorRaised = $true

            Write-Error "Error while defragmenting partition with drive letter '$($partition.DriveLetter)'$($volumeLabel): $_`r`n`r`nNo other partitions will be defragmented, and the final VHD optimization via Optimize-VHD will be skipped."

            return

        } finally {

            if (!$defragFinishedNormally -and !$defragErrorRaised) {

                Write-Warning "Detected a CTRL+C abort while defragmenting. It is highly recommended that you run checkdisk on the volume to prevent any corruption/data loss."

            }

        }

        Write-Verbose "Defragmentation succeeded! Dismounting VHD and starting final optimization via Optimize-VHD."

        Dismount-VHD -Path $FilePath -ErrorVariable err

        if ($err) {

            # This is a terminating error since we don't want to eat up all the available drive letters on the system.

            throw "Failed to dismount VHD file before final optimization. The error was: $err"

        }

        $dismountRequired = $false

        $optimizeFinishedNormally = $false

        $optimizeErrorRaised = $false

        Write-Verbose "Optimizing and compressing VHD file '$FilePath'."

        try {

            [void](Optimize-VHD $FilePath -Mode Full -ErrorAction SilentlyContinue -ErrorVariable err)

            $optimizeFinishedNormally = $true

            if ($err) {

                Write-Error "Failed final optimization via Optimize-VHD. The error was: $err"

                return

            }

        } catch {

            $optimizeErrorRaised = $true

            throw

        } finally {

            if (!$optimizeFinishedNormally -and !$optimizeErrorRaised) {

                Write-Warning "Detected a CTRL+C abort while performing final optimization. It is highly recommended that you run checkdisk on the volume to prevent any corruption/data loss."

            }

        }

        if ($alreadyMounted) {

            Write-Verbose "Mounting VHD file again since it was mounted when we started."

            Mount-VHD -Path $FilePath -ErrorVariable err

            if ($err) {

                Write-Error "Failed to mount VHD '$FilePath' again after optimization: $err"

                return

            }

        }

        $finalDiskImage = Get-DiskImage -ImagePath $FilePath -ErrorAction SilentlyContinue -ErrorVariable err

        if ($err) {

            Write-Error "Failed to obtain disk image for VHD '$FilePath' to calculate difference in size. The error was: $err"

            return

        } elseif ($null -eq $finalDiskImage) {

            Write-Error "Failed to obtain disk image for VHD '$FilePath' to calculate difference in size."

            return

        }

        $endSize = $finalDiskImage.FileSize

        # endSize - startingSize: we are tracking the change, not the amount saved.

        $change = [int64]($endSize - $startingSize)

        $formattedChange = FormatHumanReadable ([Math]::Abs($change))

        $sign = if ($change -lt 0) { "-" } else { "" }

        $output = [PSCustomObject]@{

            "Path" = $FilePath

            "OriginalSize" = $startingSize

            "CurrentSize" = $endSize

            "Change" = $change

            "ChangeFormatted" = "${sign}${formattedChange}"

        }

        Write-Output $output

    } finally {

        if ($dismountRequired) {

            Write-Verbose "Dismounting VHD since it was not dismounted earlier."

            Dismount-VHD -Path $FilePath -ErrorVariable err

            if ($err) {

                Write-Warning "VHD '$FilePath' was mounted so that it could be optimized, but failed to dismount: $err"

                Write-Warning "Please dismount the VHD manually."

            }

        }

    }

}

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

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