Ok, thanks for all the responses. I'll probably do every other week scrubs, as this is the backup data (so doesn't need to be checked constantly). I'm a little concerned about the time involved to do 33TB (after the 48TB has been RAIDed fully) when it is fully populated with filesystems and snapshots, but I'll keep an eye on it.
Thanks all. Dave -----Original Message----- From: Paul Weaver [mailto:[EMAIL PROTECTED] Sent: Tuesday, December 02, 2008 8:11 AM To: Glaser, David; zfs-discuss@opensolaris.org Subject: RE: [zfs-discuss] How often to scrub? > I have a Thumper (ok, actually 3) with each having one large pool, multiple > filesystems and many snapshots. They are holding rsync copies of multiple > clients, being synced every night (using snapshots to keep 'incremental' > backups). > > I'm wondering how often (if ever) I should do scrubs of the pools, or if > the internal zfs integrity is enough that I don't need to do manual scrubs > of the pool? I read through a number of tutorials online as well as the zfs > wiki entry, but I didn't see anything very pertinent. Scrubs are I/O > intensive, but is the Pool able to be used normally during a scrub? I > think the answer is yes, but some confirmation helps me sleep at night. Scrubs are the lowest priority, so I understand it should theoretically work fine. We've got two 48TB thumpers, with a nightly rsync from the main to the reserve. I'm currently running a scrub every Friday at 23:02, which last week took 5h15 to scrub the 7TB of used data (about 5TB of real, 2TB of snapshots) on the single pool. That's about 380MBytes/second. -- "09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0" Paul Weaver Systems Development Engineer News Production Facilities, BBC News _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
