In my recent post about the new large 64TB VMDKs available in vSphere 5.5, I mentioned that one could not hot-extend a VMDK (i.e. grow the VMDK while the VM is powered on) to the new larger size due to some Guest OS partition formats not being able to handle this change on-the-fly. The question was whether hot-extend was possible if the VMDK was already 2TB or more in size. I didn’t know the answer, so I decided to try a few tests on my environment.In my experiment I added a 3TB disk to my VM, then I tried to…