Param($VolumeName)
if ($PSBoundParameters.Count -ne 1) { exit }
if ((Get-Service -Name ClusSvc -ErrorAction SilentlyContinue).Status -ne "Running") {
  return 9999
  exit
}

$totalspace = (get-volume -FriendlyName $volumename).Size
$freespace = (get-volume -FriendlyName $volumename).SizeRemaining
return ($freespace / $totalspace * 100)