So you've got a zpool across 46 (48?) of the disks? When I was looking into our thumpers everyone seemed to think a raidz over more than 10 disks was a hideous idea.
-- Paul Weaver Systems Development Engineer News Production Facilities, BBC News Work: 020 822 58109 Room 1244 Television Centre, Wood Lane, London, W12 7RJ > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Glaser, David > Sent: 02 December 2008 13:24 > To: zfs-discuss@opensolaris.org > Subject: Re: [zfs-discuss] How often to scrub? > > 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 > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
