Date: Tue, 2 May 2006 22:18:52 +1000 From: Alastair Rankine <arsptr@optusnet.com.au> To: freebsd-questions@freebsd.org Subject: Filesystem corruption when drives are mirrored, but not otherwise Message-ID: <EA1AEB77-8AD4-443C-BDC3-EE963C75E560@optusnet.com.au>
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The story is this: two identical WD 250GB SATA drives, attached to a
Promise FastTrak S150 TX2plus.
The drives work fine independently (ie non-mirrored). But when I
mirror them using GEOM, I get filesystem corruption (see below for
example fsck output).
I have tried each drive independently as a provider for the GEOM
mirror. First ar4 then ar6, not a single instance of filesystem
corruption. But with both drives, I start to get filesystem
corruption after only a few hours of light use.
Some relevant points:
* This does not seem to be GEOM related. I got the same problem
using the two drives in a mirrored configuration using the onboard
Promise BIOS. Although I could not (easily) test the drives
independently using the Promise BIOS, I am reasonably sure the
mirrored configuration results were the same for GEOM as for the
Promise BIOS.
* The drives are identical and of similar age.
* Using smartmontools I have found no SMART errors on either of
the two drives.
* I am running FreeBSD-STABLE. I originally found this problem
when I first installed FreeBSD on this machine (6.0-RELEASE at the
time). I upgraded to -stable to pick up some ataraid fixes (at the
time I was running off the Promise BIOS), which (obviously) did not
fix the problem.
* The machine boots off a 18GB SCSI disk attached to an Adaptec
controller. This drive has performed flawlessly and does not exhibit
any of the filesystem corruption of the mirrored drives.
* The drives are mostly accessed over the network via NFS or SMB.
This has me totally confused - I don't even know if it's hardware or
software related. The only thing I can think of is to swap the
Promise controller card, but that's prettymuch a last resort. Any
help appreciated.
Example fsck output follows.
/ $ fsck /home
** /dev/mirror/gm0s1a
** Last Mounted on /home
** Phase 1 - Check Blocks and Sizes
UNKNOWN FILE TYPE I=17287183
UNEXPECTED SOFT UPDATE INCONSISTENCY
CLEAR? [yn] y
PARTIALLY ALLOCATED INODE I=20066351
UNEXPECTED SOFT UPDATE INCONSISTENCY
CLEAR? [yn] y
** Phase 2 - Check Pathnames
UNALLOCATED I=17287183 OWNER=root MODE=0
SIZE=0 MTIME=Jan 1 10:00 1970
NAME=/music/iTunes/Coldcut/Let Us Play/._1-07 Noah's Toilet.m4a
UNEXPECTED SOFT UPDATE INCONSISTENCY
REMOVE? [yn] y
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
FREE BLK COUNT(S) WRONG IN SUPERBLK
SALVAGE? [yn] y
SUMMARY INFORMATION BAD
SALVAGE? [yn] y
BLK(S) MISSING IN BIT MAPS
SALVAGE? [yn] y
30075 files, 24370829 used, 93886060 free (3100 frags, 11735370
blocks, 0.0% fragmentation)
***** FILE SYSTEM WAS MODIFIED *****
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