preferred_loop.ps1

foreach ($VM in $VMName) {
  Write-Verbose -Message "Processing VM {$VM}"
  $ClusterVM = Invoke-Command -Session $ClusterSession  -ScriptBlock {
    Get-ClusterGroup -Name $USING:VM -ErrorAction SilentlyContinue | Select-Object *
  }
  if (-not $ClusterVM) { 
    Write-Error -Message "VM {$VM} not found on cluster {$Cluster}"
  }
  else {
    $currentPreferredOwners = Invoke-Command -Session $ClusterSession  -ScriptBlock {
      Get-ClusterGroup -Name $USING:VM | Get-ClusterOwnerNode | Select-Object -ExpandProperty OwnerNodes
    }
    Write-Verbose -Message "VM {$VM} current preferred owner: {$($currentPreferredOwners -join ',')}"
    Write-Verbose -Message "Setting preferred owner: {$($PreferredOwner -join ',')} for VM {$VM} "
    Invoke-Command -Session $ClusterSession  -ScriptBlock {
      Get-ClusterGroup -Name $USING:VM | Set-ClusterOwnerNode -Owners $USING:PreferredOwner
    }
    $currentPreferredOwners = Invoke-Command -Session $ClusterSession  -ScriptBlock {
      Get-ClusterGroup -Name $USING:VM | Get-ClusterOwnerNode | Select-Object -ExpandProperty OwnerNodes
    }
    Write-Verbose -Message "VM {$VM} current preferred owner: {$($currentPreferredOwners -join ',')}"
  }
}