I have inherited a some vwmare 3.5 servers with a Fibre SAN carved into several datastores. I want to ultimately add space to one of my windows 2003 server's drives. When I look at the datastore inventory it shows almost 20GB of free space. When I edit the settings of the VM it does not show that I can increase the size of the virtual disk. ie - disk size and maximum size are the same.
Other machines with different datastores show free space and the availability of that space to the virtual disks.