Preffered_validateOwnerNode.ps1

#region Validate Preferred Owner
    $nodesInCluster = Invoke-Command -Session $ClusterSession -ScriptBlock {
      Get-ClusterNode | Select-Object -ExpandProperty Name
    }
    #null or empty string - reset to defaults
    if (-not $PreferredOwner) {
      Write-Verbose -Message "Provided no Preferred Owner. Will reset to default setting"
      $PreferredOwner = ''
    }
    #check if given hosts given in $PreferredOwner are members of $Cluster
    else {
      switch (Compare-Object -ReferenceObject @($nodesInCluster) -DifferenceObject @($PreferredOwner) -IncludeEqual ) {
        {$PSItem.SideIndicator -eq '=>'} {
          Write-Error -Message "Given preferred owner {$($PSItem.InputObject)} not found in nodes of cluster {$Cluster}. Aborting" -ErrorAction Stop
          break
        }
        {$PSItem.SideIndicator -eq '=='} {
          Write-Verbose -Message "Given preferred owner {$($PSItem.InputObject)} was found in nodes of cluster {$Cluster}" 
        }
  
      }
    }