Although I have abandoned most of my on-premise production servers in favor of Office 365, I do have a single file server that I use to store all of the stuff that I write, my business records and ...

Adding disk space to virtual machines is important to keep systems running properly and can be accomplished using Microsoft Server Hyper-V with either Hyper-V Manager or Failover Cluster Manager.

For ESXi installations, command-line options are available for virtualization administrators. For licensed installations with vCenter, the VI Toolkit is a very powerful interface to manage the hosts.