I've been playing with offlining an external USB disk as a way of having a
backup of a laptop drive. However when I online the device and scrub it I
always get cksum errors.
So I just build a v880 in the lab with a mirrored zpool. I offlined 2 disks
that form the mirror and then created a new file system. Then onlined the other
disks and started a scrub, again I get cksum errors:
v4u-880m-gmp03 19 # 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 completed with 0 errors on Fri May 19 18:12:04 2006
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
mirror ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
c1t4d0 ONLINE 0 0 1
mirror ONLINE 0 0 0
c1t3d0 ONLINE 0 0 0
c1t5d0 ONLINE 0 0 1
errors: No known data errors
v4u-880m-gmp03 20 #
I expected that the device would be brought online and resilvered (as it had
claimed it was) cleanly without any errors. Is this not the expected behaviour?
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