Adding, removing, growing and shrinking of VHDX files should be an online operation
Currently a VM has to be taken offline to add, remove, grow or shrink a VHDX. If the operating supports it this should be an online experience.
Future online capabilities should also be online in Windows Azure Pack
We are looking into this capability.
Dave Smith commented
This would eliminate a lot of support calls for us. Our client know we can live expand the disk, so we field calls to do this all the time.
Samir FARHAT (MVP) commented
Yes online capabilities must be added. I think that because Microsoft Azure is using VHD format till now, the expand property is only shown when the VM is offline, since WAP is derived form Microsoft Azure (sharing the same code)