I recently converted the Data ("D") disk on one of our VMs from VHD to VHDX in order to escape the 2TB limit. All of that went fine and I was able to set the (dynamically expanding) drive in Hyper-V to 4TB and assign it to the VM.
However, when I attempt within the VM (Server 2008R2) to extend the volume using Disk Manager, the option to extend is greyed out, even though the extra 2TB unallocated space is to the right of the D drive. The D drive I wish to extend is configured as Simple/Dynamic.
I have seen 3rd party utilities that claim to be able to do this for around $150-$200, but I'm hoping there is a way to do this from within Windows. I read it can be done by backing up the volume, deleting it and then recreating it, but I'd rather avoid the additional downtime if possible as a lot of users are on this drive all day long.
Any suggestions would be greatly appreciated!