I had an unclean shutdown because of a hang and suddenly my pool is degraded (I
realized something is wrong when python dumped core a couple of times).
This is before I ran scrub:
pool: mypool
state: DEGRADED
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
scan: scrub repaired 0 in 0h7m with 0 errors on Mon May 31 09:00:27 2010
config:
NAME STATE READ WRITE CKSUM
mypool DEGRADED 0 0 0
c6t0d0s0 DEGRADED 0 0 0 too many errors
errors: Permanent errors have been detected in the following files:
mypool/ROOT/May25-2010-Image-Update:<0x3041e>
mypool/ROOT/May25-2010-Image-Update:<0x31524>
mypool/ROOT/May25-2010-Image-Update:<0x26d24>
mypool/ROOT/May25-2010-Image-Update:<0x37234>
//var/pkg/download/d6/d6be0ef348e3c81f18eca38085721f6d6503af7a
mypool/ROOT/May25-2010-Image-Update:<0x25db3>
//var/pkg/download/cb/cbb0ff02bcdc6649da3763900363de7cff78ec72
mypool/ROOT/May25-2010-Image-Update:<0x26cf6>
I ran scrub and this is what it has to say afterwards.
pool: mypool
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
scan: scrub repaired 0 in 0h11m with 0 errors on Sat Jun 5 22:43:54 2010
config:
NAME STATE READ WRITE CKSUM
mypool DEGRADED 0 0 0
c6t0d0s0 DEGRADED 0 0 0 too many errors
errors: No known data errors
Few of questions:
1. Have the errors really gone away? Can I just clear and be content that
errors are really gone?
2. Why did the errors occur anyway if ZFS guarantees on-disk consistency? I
wasn't writing anything. Those files were definitely not being touched when the
hang and unclean shutdown happened.
I mean I don't mind if I create or modify a file and it doesn't land on disk
because on unclean shutdown happened but a bunch of unrelated files getting
corrupted, is sort of painful to digest.
3. The action says "Determine if the device needs to be replaced". How the heck
do I do that?
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