On Thu, April 29, 2010 17:35, Bob Friesenhahn wrote: > In my opinion periodic scrubs are most useful for pools based on > mirrors, or raidz1, and much less useful for pools based on raidz2 or > raidz3. It is useful to run a scrub at least once on a well-populated > new pool in order to validate the hardware and OS, but otherwise, the > scrub is most useful for discovering bit-rot in singly-redundant > pools.
I've got 10 years of photos on my disk now, and it's growing at faster than one year per year (since I'm scanning backwards slowly through the negatives). Many of them don't get accessed very often; they're archival, not current use. Scrub was one of the primary reasons I chose ZFS for the fileserver they live on -- I want some assurance, 20 years from now, that they're still valid. I needed something to check them periodically, and something to check *against*, and block checksums and scrub seemed to fill the bill. So, yes, I want to catch bit rot -- on a pool of mirrored VDEVs. -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
