Just to clarify this post. This isn't data I care about recovering. I'm just interested in understanding how zfs determined there was data corruption when I have checksums disabled and there were no non-retryable read errors reported in the messages file.
On Wed, Apr 23, 2008 at 9:52 PM, Victor Engle <[EMAIL PROTECTED]> wrote: > Thanks! That would explain things. I don't believe it was a real disk > read error because of the absence of evidence in /var/adm/messages. > > I'll review the man page and documentation to confirm that metadata is > checksummed. > > Regards, > Vic > > > > > On Wed, Apr 23, 2008 at 6:30 PM, Nathan Kroenert > <[EMAIL PROTECTED]> wrote: > > I'm just taking a stab here, so could be completely wrong, but IIRC, even > if > > you disable checksum, it still checksums the metadata... > > > > So, it could be metadata checksum errors. > > > > Others on the list might have some funky zdb thingies you could to see > what > > it actually is... > > > > Note: typed pre caffeine... :) > > > > Nathan > > > > > > > > Vic Engle wrote: > > > > > I'm hoping someone can help me understand a zfs data corruption symptom. > > We have a zpool with checksum turned off. Zpool status shows that data > > corruption occured. The application using the pool at the time reported a > > "read" error and zoppl status (see below) shows 2 read errors on a device. > > The thing that is confusing to me is how ZFS determines that data > corruption > > exists when reading data from a pool with checkdum turned off. > > > > > > Also, I'm wondering about the persistent errors in the output below. > Since > > no specific file or directory is mentioned does this indicate pool metadata > > is corrupt? > > > > > > Thanks for any help interpreting the output... > > > > > > > > > # zpool status -xv > > > pool: zpool1 > > > state: ONLINE > > > status: One or more devices has experienced an error resulting in data > > > corruption. Applications may be affected. > > > action: Restore the file in question if possible. Otherwise restore the > > > entire pool from backup. > > > see: http://www.sun.com/msg/ZFS-8000-8A > > > scrub: none requested > > > config: > > > > > > NAME STATE READ WRITE > CKSUM > > > zpool1 ONLINE 2 0 > 0 > > > c4t60A9800043346859444A476B2D48446Fd0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484352d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484236d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D482D6Cd0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D483951d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D483836d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D48366Bd0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D483551d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D483435d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D48326Bd0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D483150d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D483035d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D47796Ad0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D477850d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D477734d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D47756Ad0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D47744Fd0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D477333d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D477169d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D47704Ed0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D476F33d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D476D68d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D476C4Ed0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D476B32d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D476968d0 ONLINE 0 0 > 0 > > > c4t60A98000433468656834476B2D453974d0 ONLINE 0 0 > 0 > > > c4t60A98000433468656834476B2D454142d0 ONLINE 0 0 > 0 > > > c4t60A98000433468656834476B2D454255d0 ONLINE 0 0 > 0 > > > c4t60A98000433468656834476B2D45436Dd0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D487346d0 ONLINE 2 0 > 0 > > > c4t60A9800043346859444A476B2D487175d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D48705Ad0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486F45d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486D74d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486C5Ad0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486B44d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486974d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486859d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486744d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486573d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486459d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486343d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D486173d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D482F58d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D485A43d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D485872d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D485758d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D485642d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D485471d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D485357d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D485241d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D485071d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484F56d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484E41d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484C70d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484B56d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484A2Dd0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484870d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D484755d0 ONLINE 0 0 > 0 > > > c4t60A9800043346859444A476B2D48462Dd0 ONLINE 0 0 > 0 > > > > > > errors: The following persistent errors have been detected: > > > > > > DATASET OBJECT RANGE > > > zpool1 17 2428895232-2429026304 > > > zpool1 17 2429026304-2429157376 > > > zpool1 17 2429157376-2429288448 > > > zpool1 17 2429288448-2429419520 > > > zpool1 17 2429419520-2429550592 > > > zpool1 17 2463629312-2463760384 > > > zpool1 17 2463760384-2463891456 > > > zpool1 17 2463891456-2464022528 > > > zpool1 17 2464022528-2464153600 > > > zpool1 17 2464153600-2464284672 > > > zpool1 18 2397700096-2397831168 > > > zpool1 18 2397831168-2397962240 > > > zpool1 18 2397962240-2398093312 > > > zpool1 18 2398093312-2398224384 > > > zpool1 18 2398224384-2398355456 > > > zpool1 18 2432434176-2432565248 > > > zpool1 18 2432565248-2432696320 > > > zpool1 18 2432696320-2432827392 > > > zpool1 18 2432827392-2432958464 > > > zpool1 18 2432958464-2433089536 > > > zpool1 19 2418933760-2419064832 > > > zpool1 19 2419064832-2419195904 > > > zpool1 19 2419195904-2419326976 > > > zpool1 19 2419326976-2419458048 > > > zpool1 19 2453798912-2453929984 > > > zpool1 19 2453929984-2454061056 > > > zpool1 19 2454061056-2454192128 > > > zpool1 19 2454192128-2454323200 > > > This message posted from opensolaris.org > > > _______________________________________________ > > > zfs-discuss mailing list > > > zfs-discuss@opensolaris.org > > > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > > > > > > > -- > > ////////////////////////////////////////////////////////////////// > > // Nathan Kroenert [EMAIL PROTECTED] // > > // Technical Support Engineer Phone: +61 3 9869-6255 // > > // Sun Services Fax: +61 3 9869-6288 // > > // Level 3, 476 St. Kilda Road // > > // Melbourne 3004 Victoria Australia // > > ////////////////////////////////////////////////////////////////// > > > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
