Summary: A script to calculate the free space on NetApp mvolumes using PowerShell.
Date: Around 2014
Refactor: 6 April 2025: Checked links and formatting.

This is a script to calculate the amount of free space on NetApp Volumes (which is nice if you have thin provisioned LUNs).

# Debug mode
$debug = 0
if ($debug -eq "1"){Write-Host "DEBUG mode enabled!"; $ErrorActionPreference = "Stop"; Write-Host "On error: $ErrorActionPreference"}
 
# Import DATA ONTAP Module
Import-module D:\sjoerd\DataONTAP
 
# Select Filer with default option provided
$filer = Read-Host "Please enter the name of the filer you want to query [filer01]"
if ($filer -eq ""){$filer = "filer01"}
 
# Getting credentials for NetApp filer
while ($filercredentials -eq $null) {
  Write-Host "Please provide authentication credentials for NetApp filer $filer"
  $filercredentials = $Host.UI.PromptForCredential("Please enter credentials", "Enter NetApp filer credentials", "root", "")
}
 
# Connect to Filer
Connect-NaController $Filer -Credential $filercredentials | Out-Null
 
# Create a hash table for clear view of the output
$myTable = @()
 
ForEach ($volume in (Get-NaVol)){
   $SpaceInfo = "" | Select VolumeName,TotalSize,FreeSpace
   $SpaceInfo.VolumeName = $volume
   $totalsize = (Get-NaVol $volume).TotalSize
   $SpaceInfo.TotalSize = $totalsize / 1073741824
   $leftoversize = $totalsize
   Write-Host "Calculating free space for volume $volume with a total size of $SpaceInfo.TotalSize GB."
   ForEach ($lun in (Get-NaLun | where {$_.Path -match "/$volume/"})){
      if ($debug -eq "1"){Write-Host "Doing $lun now"}
      $lunsize = (Get-NaLun $lun).TotalSize
      $leftoversize = $leftoversize - $lunsize
      if ($debug -eq "1"){Write-Host "$volume with a total size of $totalsize has now $leftoversize space left"}
   }
   # Convert the amount of bytes left to gigabytes left and round it up to 2 decimals.
   $SpaceInfo.FreeSpace = [Math]::Round(($leftoversize / 1073741824),2)
 
$myTable += $SpaceInfo
 
}
 
$myTable