Comment 7 for bug 1578036

Hi @nnex, I have also observed this and it appears to be a result of the switch (I think in Mitaka) to using os_brick.initiator.linuxrbd.RBDImageIOWrapper from cinder.volume.drivers.rbd.RBDImageIOWrapper in cinder.backup.manager. Problem is that the newer brick RBDImageIOWrapper class does not have an 'rbdimage' attribute so the ceph backup driver fails to establish that the source volume is of type rbd and therefore falls back to doing a full copy. One way to fix this would be to add that rbdimage attr to the brick class making it the same as its cinder counterpart.