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server pause and volume backup create

asked 2019-06-20 09:09:27 -0500

minimike gravatar image


Just a question about about backups. To pause a server and take backups from its volumes, would that be save? How would it be if I use a snapshot as source of the volume, and delete the snapashot on later time? Or how you deal with running VM's they volumes shall have a backup? But can't be paused, suspended or shut downed

cheers Darko

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answered 2019-06-21 07:31:04 -0500

eblock gravatar image

I don't have a general recommendation for you, just some own experience. Our storage backend for glance, nova and cinder is Ceph. For backups we take rbd snapshots (not nova or cinder snapshots!) of the respective disks/volumes and export them to an external backup server. We already had to deal with disaster recovery and had no problems with data inconsistencies after reimporting instances from backup. Of course there's always a risk of data inconsistency if you take a snapshot of a running instance, depending on the amount and speed of data being written. To lower that risk we run full backups of the instances weekly, e.g. on Sundays when there are almost no users working in that environment. If the backup was successful we delete the snapshot immediately, but some administrators work with incremental snapshots of cinder volumes. I don't know the Pros and Cons, to be honest. Does this help in any way?

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Asked: 2019-06-20 09:09:27 -0500

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Last updated: Jun 21 '19