Comment 4 for bug 1803331

As discussed on IRC, I don't believe any data has been lost here, but it would be good if the reporter could confirm.

I believe the source node will have copied the root disk to the instance directory on the destination, but the destination is configured to expect an RBD disk, so doesn't find it. The root disk should also still exist on the source node in the _resized directory, and should be restored with a revert resize.