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Chris Gerhard's Weblog
Monday September 25, 2006
Has ZFS just saved my data? My new home server has had it's first ZFS checksum error. The problem here is that zfs has not told me what that error was so it is impossible for me to say how bad it is, or heaven forbid, that it could be a false positive.
It leaves lots of questions in my mind about what ZFS does, if anything, to verify the kind of problem to attempt to narrow down where the fault is. Need to do some reading of the zfs source.
# zpool status
pool: tank
state: ONLINE
status: One or more devices has experienced an unrecoverable error. An
attempt was made to correct the error. Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
using 'zpool clear' or replace the device with 'zpool replace'.
see: http://www.sun.com/msg/ZFS-8000-9P
scrub: scrub in progress, 0.01% done, 20h7m to go
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
mirror ONLINE 0 0 0
c1d0s7 ONLINE 0 0 1
c5d0s7 ONLINE 0 0 0
errors: No known data errors
#
One thing I did straight away was to scrub the pool. However the scrub never completed, just exercised the disks all weekend. Checking the OpenSolaris ZFS discussion forum I was hitting this bug:
6343667 need itinerary so interrupted scrub/resilver doesn't have to start over
Where the scrub gets restarted when
ever a snapshot is taken. Not so good if you snaphost every 10
minutes.
Tags: home server opensolaris zfs
( Sep 25 2006, 05:38:06 PM BST ) Permalink
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