function Stop-VMParallel {
param([array]$VMs, [int]$Throttle = 8)

```
$VMs | ForEach-Object -Parallel {
    Import-Module VMware.PowerCLI -ErrorAction SilentlyContinue

    $vm = $_

    if ($vm.PowerState -ne "PoweredOn") { return }

    try {
        Shutdown-VMGuest -VM $vm -Confirm:$false -ErrorAction Stop
    }
    catch {
        Write-Host "[ERROR] VM failed: $($vm.Name)"
    }
} -ThrottleLimit $Throttle
```

}

function Stop-VMsByGroup {
param($VMGroups)

```
$groups = $VMGroups.Gruppe | Sort-Object -Unique

foreach ($g in $groups) {

    $names = ($VMGroups | Where-Object Gruppe -eq $g).Server
    $vms = Get-VM | Where-Object { $names -contains $_.Name }

    if ($vms) {
        Stop-VMParallel -VMs $vms
        Start-Sleep 30
    }
}
```

}

function Stop-UnknownVMs {
param($VMGroups, $ExcludeRegex)

```
$vms = Get-VM | Where-Object {
    ($VMGroups.Server -notcontains $_.Name) -and
    ($_.Name -notmatch $ExcludeRegex)
}

if ($vms) {
    Stop-VMParallel -VMs $vms
}
```

}

function Stop-ClusterSafe {
param([string]$Cluster, [string]$Reason)

```
Invoke-Retry -Name "Cluster shutdown" -Action {
    Stop-VsanCluster -Cluster $Cluster -PowerOffReason $Reason -ErrorAction Stop | Out-Null
}
```

}