I didn't merge a Grommunio/OpenSuse yet but with Debian i had no problems.
Did you configure the Hardware to be virtio stuff?
Maybe check the consistency of your disk on the ESXi first. If it's still a BTRFS-System nvm.. /dev/grommunio/LVRoot means XFS...
but you maybe wanna just install a fresh System and transfer(backup/recover) the whole thing to the new one if that keeps happening.