Hi guys!
I'm doing series of tests on ZFS before putting it into production on several
machines, and I've come to a dead end. I have two disks in mirror (rpool).
Intentionally, I corrupt data on second disk:
# dd if=/dev/urandom of=/dev/rdsk/c0d1t0 bs=512 count=20480 seek=10240
So, I've written 10MB's of random data after first 5MB's of hard drive. After
sync and reboot, ZFS got the corruption noticed, and then I run zpool scrub
rpool. After that, I've got this state:
unknown# zpool status
pool: rpool
state: DEGRADED
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 for 0h0m, 5.64% done, 0h5m to go
config:
NAME STATE READ WRITE CKSUM
rpool DEGRADED 0 0 0
mirror DEGRADED 0 0 0
c0d1s0 DEGRADED 0 0 26 too many errors
c0d0s0 ONLINE 0 0 0
errors: No known data errors
So I wonder now, how to fix this up? Why doesn't scrub overwrite bad data with
good data from first disk?
If I run zpool clear, it will only clear the error reports, and it won't fixed
them - I presume that because I don't understand the man page for that section
clearly.
So, how can I fix this disk, without detach/attach procedure?
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