Hi, My zpool is reporting unrecoverable errors with the metadata:
pool: rpool2 > state: ONLINE > status: One or more devices has experienced an error resulting in data > corruption. Applications may be effected. > action: Restore the file in question if possible. Otherwise restore the > entire pool from backup. > see: http://www.sun.com/msg/ZFS-8000-8A > > (snip) > > "errors: Permanent errors have been detected in the following files: > <metadata>:<0x0> > <metadata>:<0x1> > It initially reported a DEGRADED pool, but after a reboot, the pool is now ONLINE and a quick inspection indicates that my data is present and intact (though the errors stop the file-systems in the pool from mounting at boot - it drops into maintenance mode). My reading of http://www.sun.com/msg/ZFS-8000-8A indicates I should destroy the pool and start again, but http://www.crypticide.com/dropsafe/article/2162 gives me some small hope that this might be fixable... The pool has been 'a little flakey' since I built it two months back. I've been getting small numbers of read and checksum errors on a few of the disks each day. Initially I replaced the disks, but they would always pass all testing, so lately I've just been clearing the errors each day and looking for another solution. I thought I had found it when I discovered WD had a firmware patch (http://www.3ware.com/kb/article.aspx?id=15592 , http://blog.insanegenius.com/2009/09/western-digital-re4-gp-2tb-drive.html) which solved bugs in the drive spin-up behaviour which has been causing problems for various hardware RAID controllers. So, yesterday I shutdown the machine, pulled 2 of the 4 troublesome disks, and applied the firmware upgrade (04.05G05). When I booted, the pool was degraded and showed metadata errors. After a shutdown and cold start, the pool was ONLINE but still have metadata errors (so somewhat inconsistent guidance from ZPOOL STATUS. Can anyone explain what this 'metadata' is? More Details: - This is a backup server so I can rebuild if necessary, but on principle I'd like to have a go at fixing it... - The zpool has 96 x 2TB drives divided in to RAIDZ2 sets of 8 (6+2). - The drives are Western Digital RE-4's (WD2002FYPS). - Running OpenSolaris build snv_111b. - Drives are in two AIC JBODs connectected via SAS. - HBA is an LSI 3801E - Server is 1RU SuperMicro Intel. Any advice appreciated! :-) Paul Tetley NearMap Pty Ltd
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