Affinity1.ps1

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}" 
  }
}