function Stop-VMsByGroup {
param($VMGroups)

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

foreach ($g in $groups) {

    $names = ($VMGroups | Where-Object Gruppe -eq $g).Server

    $vms = Get-VM | Where-Object { $names -contains $_.Name }

    foreach ($vm in $vms) {
        if ($vm.PowerState -eq "PoweredOn") {
            Shutdown-VMGuest -VM $vm -Confirm:$false -ErrorAction SilentlyContinue
        }
    }

    Start-Sleep -Seconds 60
}
```

}

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

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

foreach ($vm in $vms) {
    if ($vm.PowerState -eq "PoweredOn") {
        Shutdown-VMGuest -VM $vm -Confirm:$false -ErrorAction SilentlyContinue
    }
}
```

}

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

```
Stop-VsanCluster -Cluster $Cluster -PowerOffReason $Reason -ErrorAction Stop | Out-Null
```

}

function Stop-VMHostSafe {
param([string]$VMHost)

```
Set-VMHost -VMHost $VMHost -State Maintenance -Confirm:$false | Out-Null
Stop-VMHost -VMHost $VMHost -Confirm:$false -ErrorAction Stop | Out-Null
```

}