In a DNE system, it is not safe to do writeconf of a MD target and attempt to mount (and re-register) it again, as it creates weird MDT-MDT osp devices as "fsname-MDT0001-osp-MDT0001". But it would be nice to have such a possibility to fix a half-failed target registration, when MGS completes the registration process but the target fails with a timeout not knowing about registration success.