VM disk space details using powercli

VM disk space details using powercli

If the VMs have VMware tools installed, you can read the free space of the partitions on the OS side with Get-VMGuest like:

PS D:\> (Get-VM MyVM | Get-VMGuest).Disks

CapacityGB      FreeSpaceGB     Path

----------      -----------     ----

29,483          10,998          C:\

9,967           5,845           F:\

9,967           8,552           D:\

9,967           9,371           E:\

The problem is that this only lists formatted partitions, and you can't directly correlate a certain OS partition to a certain virtual disk without adding some substantial logic that would probably involve executing commands inside the Guest OS with Invoke-VMScript to be reliable. It gets even more complicated if there are multiple partitions on the same disk, or there is unpartitioned/unformatted disk space.

The following snippet will output the total free space of all partitions combined (which will be repeated per disk):

Get-VM | ForEach {
  $vm = $_
  Get-harddisk -VM $_ | Select-Object -Property Parent, Name, StorageFormat, CapacityGB,
    @{N='OS Total Free Space GB of all partitions combined'; E={ [math]::round((Get-VMGuest $vm | ForEach-Object { ($_.Disks) } | Measure-Object -property FreeSpaceGB -sum).Sum)}}
} | Format-Table -Autosize





Parent         
Name       
StorageFormat CapacityGB 
OS Total Free Space GB of all disks combined
------         
----       
------------- ----------
 --------------------------------------------
VM1            
Hard disk 1        
Thick     
30                                       
24
VM1            
Hard disk 2        
Thick     
10                                       
24
VM2            
Hard disk 1         
Thin     
30                                       
35
VM2            
Hard disk 2 EagerZeroedThick     
10                                       
35
35