Hi Eugen, Thanks for the response! That makes a lost of sense and is what I figured was going on but I missed it in the documentation. We use Ceph as well and I had considered doing the snapshots at the RBD level but I was hoping there was someway to accomplish this via nova. I came across this Sebastien Han write-up that claims this functionality was added to Mitaka: http://www.sebastien-han.fr/blog/2015/10/05/openstack-nova-snapshots-on-ceph-rbd/
We are running Mitaka but our snapshots are not happening at the RBD level, they are being copied and uploaded to glance which takes up a lot of space and is very slow. Have you or anyone else implemented this in Mitaka? Other than Sebastian's blog I haven't found any documentation on this. Thank You, ___ John Petrini On Wed, Jan 11, 2017 at 3:32 AM, Eugen Block <ebl...@nde.ag> wrote: > Hi, > > this seems to be exptected, the docs say: > > "Shut down the source VM before you take the snapshot to ensure that all > data is flushed to disk." > > So if the VM is not shut down, it's freezed to prevent data loss (I > guess). Depending on your storage backend, there are other ways to perform > backups of your VMs. > We use Ceph as backend for nova, glance and cinder. Ceph stores the disks, > images and volumes as Rados block device objects. We have a backup script > that creates snapshots of these RBDs, which are exported to our backup > drive. This way the running VM is not stopped or freezed, the user doesn't > notice any issues. Unlike a nova snapshot, the rbd snapshot is created > immediately within a few seconds. After a successful backup the snapshots > are removed. > > Hope this helps! If you are interested in Ceph, visit [1]. > > Regards, > Eugen > > [1] http://docs.ceph.com/docs/giant/start/intro/ > > > Zitat von John Petrini <jpetr...@coredial.com>: > > > Hello, >> >> I've just started experimenting with nova backup and discovered that there >> is a period of time during the snapshot where the instance becomes >> unreachable. Is this behavior expected during a live snapshot? Is there >> any >> way to prevent this? >> >> ___ >> >> John Petrini >> > > > > -- > Eugen Block voice : +49-40-559 51 75 > NDE Netzdesign und -entwicklung AG fax : +49-40-559 51 77 > Postfach 61 03 15 > D-22423 Hamburg e-mail : ebl...@nde.ag > > Vorsitzende des Aufsichtsrates: Angelika Mozdzen > Sitz und Registergericht: Hamburg, HRB 90934 > Vorstand: Jens-U. Mozdzen > USt-IdNr. DE 814 013 983 > > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstac > k > Post to : openstack@lists.openstack.org > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstac > k >
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