Retrieving the disk space utilization on Azure VM using PowerShell script?

Question

I need clarification on whether it is possible to query the Azure VM disk space utilization.

The PowerShell command below does not accurately show the usage; it only displays the VM disk size.

https://learn.microsoft.com/en-us/powershell/module/az.compute/get-azvm?view=azps-12.4.0

https://learn.microsoft.com/en-us/powershell/module/az.compute/get-azdisk?view=azps-12.4.0

Any help would be greatly appreciated.

Answer 1

To retrieve disk space utilization (the actual used and free space), you'll need to interact with the VM operating system itself.

To accomplish this, you can use Azure VM Custom Script Extension. This will run a script inside the VM to check the disk utilization directly. Here's how you can do that:

• Using the Custom Script Extension: You can use the Custom Script Extension for Windows or Linux VMs to run a script on the VM that checks the disk space usage. For Windows, you can use PowerShell inside the VM to check disk utilization:

    Get-WmiObject Win32_LogicalDisk | Select-Object DeviceID, MediaType, @{Name="Used(GB)"; Expression={[math]::round($_.Size/1GB - $_.FreeSpace/1GB,2)}}, @{Name="Free(GB)"; Expression={[math]::round($_.FreeSpace/1GB,2)}}, @{Name="Size(GB)"; Expression={[math]::round($_.Size/1GB,2)}}
  

  You can then use the Custom Script Extension to deploy and run this script on your Azure VM.
• For Linux, you could use a bash script to check the disk space:

    df -h | grep -E '^/dev/'
  

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hth

Marcin