Incorrect backing device type
From jasonhoss.com
Issue
When adding a LUN to the guest, the following error occurs:
# hpvmmodify -P guest1 -a disk:avio_stor::disk:/dev/rdisk/disk(xx) hpvmmodify ERROR (guest1): Incorrect backing device type. hpvmmodify Unable to create device disk:avio_stor::disk:/dev/rdisk/disk(xx) hpvmmodify Unable to modify the guest.