On Sun, Jan 17, 2010 at 08:05:27AM -0800, Richard Elling wrote: > > Personally, I like to start with a fresh "full" image once a month, and > > then do daily incrementals for the rest of the month. > > This doesn't buy you anything.
.. as long as you scrub both the original pool and the backup pool with the same regularity. sending the full backup from the source is basically the same as a scrub of the source. If scrub ever find an error on your backup pool, you will need to re-send the snapshots as a full stream from scratch (or at least from a snapshot from before where the bad blocks are referenced). You can't just copy over the damaged file into the top filesystem on the backup media, because if you write to that filesystem you will no longer be able to recv new relative snapshots into it (without rolling back with xfs recv -F) > > To solve this problem, I have more than one external disk, and > > occasionally rotate them. That's a good idea regardless, with one on-site to be used regularly, and one off-site in case of theft/fire/etc. If you rotate, say, once a month, and can keep at least a month-and-a-day's worth of snapshots on the primary pool, then you can fully catch up the month-old disk after a changeover. > ZFS isn't like normal backups Hooray! -- Dan.
pgpGZZZCTa5uo.pgp
Description: PGP signature
_______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
