Last night we received an alert from OpsMan about one of our VMM servers running low on drive space. I figured, "no problem, I'll just pop into Hyper-V Manager and expand the disk". To my dismay, I quickly remembered that I had removed the GUI. "How the heck am I going to expand that disk???", I quietly said to myself.
In comes Powershell...
Using Powershell I was able to expand the disk within seconds! The cmdlet is simple, you just need to know the path to the VHD/VHDX.
Resize-VHD -Path \\SOFS01\virtualHardDisk.vhdx -SizeBytes 80GB
Then boot the server, open Disk Management, and extend the volume.