Param($PoolName)
if ((Get-Service -Name ClusSvc -ErrorAction SilentlyContinue).Status -ne "Running") {
  return 9999
  exit
}

if($PoolName -eq $null) { $PoolName = "S2D*" }

$storpool = (Get-StoragePool -FriendlyName $PoolName)
return (($storpool.Size - $storpool.AllocatedSize)/$storpool.Size * 100)