Le 17 janv. 10 à 11:38, Edward Ned Harvey a écrit :
Personally, I use "zfs send | zfs receive" to an external disk.Initially afull image, and later incrementals.Do these incrementals go into the same filesystem that received the original zfs stream?Yes. In fact, I think that's the only way possible. The end result is ... On my external disk, I have a ZFS filesystem, with snapshots. Each snapshot corresponds to each incremental send| receive.Personally, I like to start with a fresh "full" image once a month, and then do daily incrementals for the rest of the month.There is one drawback: If I have >500G filesystem to backup, and I have 1Tb target media ... Once per month, I have to "zpool destroy" the target media before I can write a new full backup onto it. This leaves a gap where the backup has been destroyed and the new image has yet to be written.To solve this problem, I have more than one external disk, and occasionally rotate them. So there's still another offline backup available, if something were to happen to my system during the moment when the backup was being destroyed once per month.
ZFS can check the pool and make sure that there is no error.Running 'zpool scrub' on the two pools from time to time - let's say every month - should give you a similar level of protection without the need for a full backup.
Even when backing up with rsync+zfs snapshot, a full incremental every month may not be required. A rsync run with the --checksum option every month may be good enough. It forces the read of the full data on both sides, but at least it avoids the network transfer if the pools are on different hosts, and it avoids increasing the space used by the snapshots.
Gaëtan -- Gaëtan Lehmann Biologie du Développement et de la Reproduction INRA de Jouy-en-Josas (France) tel: +33 1 34 65 29 66 fax: 01 34 65 29 09 http://voxel.jouy.inra.fr http://www.itk.org http://www.mandriva.org http://www.bepo.fr
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