Date: Tue, 01 Jan 2008 22:44:43 -0600 From: Eric Anderson <anderson@freebsd.org> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: ZFS i/o errors - which disk is the problem? Message-ID: <477B16BB.8070104@freebsd.org>
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I created a zpool with two new identical (500GB) SATA disks. I rsync'ed
a bunch of data over to the new ZFS file systems, and started seeing i/o
errors.
Here's how I created the file systems:
zpool create tank mirror ad6 ad8
zfs create tank/media
zfs create tank/documents
zfs set sharenfs=on tank/media
zfs set sharenfs=on tank/documents
zfs set atime=off tank
zfs set mountpoint=/media tank/media
zfs set mountpoint=/documents tank/documents
Here's what zpool status says:
# zpool status
pool: tank
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: scrub completed with 731 errors on Tue Jan 1 15:17:08 2008
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 1.47K
mirror ONLINE 0 0 1.47K
ad6 ONLINE 0 0 5.12K
ad8 ONLINE 0 0 4.66K
How can I tell which drive gave the problems, or where the problem came
from? I see several errors in /var/log/messages, like:
ZFS: zpool I/O failure, zpool=tank error=86
and many many of these:
ZFS: checksum mismatch, zpool=tank path=/dev/ad6 offset=31970426880
size=131072
for both the ad6 and ad8 devices.
I'm happy to swap the drive out, but I don't know which is the problem.
I was also wondering if it was a saturated I/O issue on the system
(it's a fairly slow and poky old box).
Any ideas/hints?
Eric
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