On Tue, Jan 24, 2012 at 10:50 AM, Stefan Ring <stefan...@gmail.com> wrote:
> After having read this mailing list for a little while, I get the > impression that there are at least some people who regularly > experience on-disk corruption that ZFS should be able to report and > handle. I’ve been running a raidz1 on three 1TB consumer disks for > approx. 2 years now (about 90% full), and I scrub the pool every 3-4 > weeks and have never had a single error. From the oft-quoted 10^14 > error rate that consumer disks are rated at, I should have seen an > error by now -- the scrubbing process is not the only activity on the > disks, after all, and the data transfer volume from that alone clocks > in at almost exactly 10^14 by now. The 10^-14 (or 10^-15 or 10^-16) number is a statistical average. So if you have a big enough pool of drives, for every drive that moves more than 10^14 with no uncorrectable errors, then there will be a drive that moves less than 10^14 before hitting an uncorrectable error. The three 1 TB consumer drives you have must have been manufactured on a "good day" and not a "bad day" :-) Note the error rate is 10^-14 (or 10^-15 or 10^-15) which translates into one error per 10^14 bits (bytes ?) transferred to / from the drive. Note the sign change on the exponent :-) -- {--------1---------2---------3---------4---------5---------6---------7---------} Paul Kraus -> Senior Systems Architect, Garnet River ( http://www.garnetriver.com/ ) -> Sound Coordinator, Schenectady Light Opera Company ( http://www.sloctheater.org/ ) -> Technical Advisor, Troy Civic Theatre Company -> Technical Advisor, RPI Players _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss