Hi, It seems Ceph doesn't allow rados pool snapshots on RBD pools which have or had RBD snapshots. They only work on RBD pools which never had a RBD snapshot. So, basically this works: rados mkpool test-pool 1024 1024 replicated rbd -p test-pool create --size=102400 test-image ceph osd pool mksnap test-pool rados-snap But this doesn't: rados mkpool test-pool 1024 1024 replicated rbd -p test-pool create --size=102400 test-image rbd -p test-pool snap create test-image@rbd-snap ceph osd pool mksnap test-pool rados-snap And we get the following error message: Error EINVAL: pool test-pool is in unmanaged snaps mode I've been checking the source code and it seems to be the expecte behavior, but I did not manage to find any information regarding "unmanaged snaps mode". Also I did not find any information about RBD snapshots and pool snapshots being mutually exclusive. And even deleting all the RBD snapshots in a pool doesn't enable RADOS snapshots again. So, I have a couple of questions: - Are RBD and RADOS snapshots mutually exclusive? - What does mean "unmanaged snaps mode" message? - Is there any way to revert a pool status to allow RADOS pool snapshots after all RBD snapshots are removed? We are designing a quite interesting way to perform incremental backups of RBD pools managed by OpenStack Cinder. The idea is to do the incremental backup at a RADOS level, basically using the mtime property of the object and comparing it against the time we did the last backup / pool snapshot. That way it should be really easy to find modified objects transferring only them, making the implementation of a DR solution easier.. But the issue explained here would be a big problem, as the backup solution would stop working if just one user creates a RBD snapshot on the pool (For example using Cinder Backup). I hope somebody could give us more information about this "unmanaged snaps mode" or point us to a way to revert this behavior once all RBD snapshots have been removed from a pool. Thanks! Saludos cordiales, Xavier Trilla P. Silicon Hosting ¿Sabías que ahora en SiliconHosting resolvemos tus dudas técnicas gratis? Más información en: siliconhosting.com/qa/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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