Find orphaned VMDKs in VMware vSphere

orphaned-vm-disks.ps1

# Don't forget to run Connect-VIServer before running this script
# Tested against vSphere 6.7 using PSCore 7

# Function from https://theposhwolf.com/howtos/Format-Bytes/
# https://github.com/ThePoShWolf/Utilities/blob/88860fefb1e35a6f71e9799e1a51ae903d074f8d/Misc/Format-Bytes.ps1
# under MIT license: https://github.com/ThePoShWolf/Utilities/blob/88860fefb1e35a6f71e9799e1a51ae903d074f8d/LICENSE
Function Format-Bytes {
    Param
    (
        [Parameter(
            ValueFromPipeline = $true
        )]
        [ValidateNotNullOrEmpty()]
        [float]$number
    )
    Begin{
        $sizes = 'KB','MB','GB','TB','PB'
    }
    Process {
        for($x = 0;$x -lt $sizes.count; $x++){
            if ($number -lt [int64]"1$($sizes[$x])"){
                if ($x -eq 0){
                    return "$number B"
                } else {
                    $num = $number / [int64]"1$($sizes[$x-1])"
                    $num = "{0:N2}" -f $num
                    return "$num $($sizes[$x-1])"
                }
            }
        }
    }
    End{}
}

# based on http://www.vmwareadmins.com/finding-orphaned-vmdks-using-powercli/

$arrUsedDisks = Get-VM | Get-HardDisk | %{$_.filename}
$arrUsedDisks += Get-Template | Get-HardDisk | %{$_.filename}

Write-Host "Found $($arrUsedDisks.Count) disks referenced by VMs or templates"
$arrDS = Get-Datastore
Write-Host "Found $($arrDS.Count) datastores"

$totalOrphanedSize = 0

Foreach ($strDatastore in $arrDS)
{
    Write-Host "Checking datastore $($strDatastore.name)"
    $ds = Get-Datastore -Name $strDatastore.name | %{Get-View $_.Id}
    $fileQueryFlags = New-Object VMware.Vim.FileQueryFlags
    $fileQueryFlags.FileSize = $true
    $fileQueryFlags.FileType = $true
    $fileQueryFlags.Modification = $true
    $searchSpec = New-Object VMware.Vim.HostDatastoreBrowserSearchSpec
    $searchSpec.details = $fileQueryFlags
    $searchSpec.sortFoldersFirst = $true
    $dsBrowser = Get-View $ds.browser
    $rootPath = "[$($ds.summary.Name)]"
    $searchResult = $dsBrowser.SearchDatastoreSubFolders($rootPath, $searchSpec)
    $dsTotalOrphanedSize = 0
    foreach ($folder in $searchResult)
    {
        foreach ($fileResult in $folder.File)
        {
            If (
                $fileResult.Path -and
                $fileResult.Path.EndsWith(".vmdk") -and
                !$fileResult.Path.EndsWith("-flat.vmdk") -and
                !$fileResult.Path.EndsWith("delta.vmdk") -and
                !$fileResult.Path.EndsWith("-ctk.vmdk") -and
                !($arrUsedDisks -contains "$($folder.FolderPath)$($fileResult.Path)")
            ) {
                $dsTotalOrphanedSize += $fileResult.FileSize
                Write-Host "Orphaned VMDK Found: $($folder.FolderPath)$($fileResult.Path) ($($fileResult.FileSize | Format-Bytes))"
            }
        }
    }
    $totalOrphanedSize += $dsTotalOrphanedSize
    Write-Host "[$($ds.summary.Name)] Found $($dsTotalOrphanedSize | Format-Bytes) of orphaned disks"
}

Write-Host "Found $($totalOrphanedSize | Format-Bytes) of orphaned disks across all datastores"