Hi On 11/02/16 16:51, Shoham Peller wrote: > if the volume we want to update is the boot > volume, detaching to update the bdm, is not even possible. You might be interested in the approved spec [1] we have for Mitaka (ref. detach boot volume). Unfortunately the spec was not part of the high-priority list and it didn't get implemented but we are going to propose it again for Newton. Regards -- Andrea Rosa [1] http://specs.openstack.org/openstack/nova-specs/specs/mitaka/approved/detach-boot-volume.html