I was looking at one of my FreeNAS installations the other day. Unfortunately I found one of my drives with errors and as far as I remember those files were corrupt during the file transfer so I was quite sure the drive is OK - I had it tested with UBCD/Vivard anyway. So here is what I did to clear the error. If you experience those errors constantly consider replacing the drive (see the references).
zpool status -v
pool: ITSoft
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://illumos.org/msg/ZFS-8000-8A
scan: scrub repaired 0 in 0h12m with 2 errors on Sun Jul 27 00:12:58 2014
config:
NAME STATE READ WRITE CKSUM
ITSoft ONLINE 0 0 2
gptid/6358bf65-f6ea-11e3-9135-080027eb8f88 ONLINE 0 0 4
errors: Permanent errors have been detected in the following files:
/mnt/ITSoft/DriverPack_12.3.iso
/mnt/ITSoft/DRP13-R377-DVD.iso
zpool clear ITSoft gptid/6358bf65-f6ea-11e3-9135-080027eb8f88
Here I did the mistake of deleting both of the files. Don't do it. Some explanations why not to do it, before clearing the drive - see the references.
"That error is telling you that inode <0x9f115> is corrupt (deleting the file broke the
filename->inode mapping, so it's just reporting the inode now). Either something still has the
file open or the metadata just needs to be cleaned up (which a scrub should do)."
"Normally, the path and name of the file with the error would be displayed, the <0x80> suggests
the corrupted file was deleted (before or after the error). It is a reference to the indirect
block that contained the file. This suggests that no active files were corrupted, just a file
that was already deleted, or has since been deleted."
pool: ITSoft
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://illumos.org/msg/ZFS-8000-8A
scan: scrub repaired 0 in 0h12m with 2 errors on Sun Jul 27 00:12:58 2014
config:
NAME STATE READ WRITE CKSUM
ITSoft ONLINE 0 0 2
gptid/6358bf65-f6ea-11e3-9135-080027eb8f88 ONLINE 0 0 0
errors: Permanent errors have been detected in the following files:
ITSoft:<0xab>
ITSoft:<0xae>
So once the damage has been done I had to repair it.
zpool scrub ITSoft
This will take some time so check the status zpool status -v to see the progress.
pool: ITSoft
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://illumos.org/msg/ZFS-8000-9P
scan: scrub repaired 0 in 0h12m with 0 errors on Thu Aug 14 00:30:25 2014
config:
NAME STATE READ WRITE CKSUM
ITSoft ONLINE 0 0 0
gptid/6358bf65-f6ea-11e3-9135-080027eb8f88 ONLINE 0 0 89
errors: No known data errors
And just in case another clear:
zpool clear -F ITSoft
End result:
References:
http://serverfault.com/questions/581351/zfs-checksum-errors-what-files-are-affected
http://serverfault.com/questions/576898/clear-a-permanent-zfs-error-in-a-healthy-pool
http://www.retrospekt.dk/2011/08/zfs-drive-replacement/
zpool status -v
pool: ITSoft
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://illumos.org/msg/ZFS-8000-8A
scan: scrub repaired 0 in 0h12m with 2 errors on Sun Jul 27 00:12:58 2014
config:
NAME STATE READ WRITE CKSUM
ITSoft ONLINE 0 0 2
gptid/6358bf65-f6ea-11e3-9135-080027eb8f88 ONLINE 0 0 4
errors: Permanent errors have been detected in the following files:
/mnt/ITSoft/DriverPack_12.3.iso
/mnt/ITSoft/DRP13-R377-DVD.iso
zpool clear ITSoft gptid/6358bf65-f6ea-11e3-9135-080027eb8f88
Here I did the mistake of deleting both of the files. Don't do it. Some explanations why not to do it, before clearing the drive - see the references.
"That error is telling you that inode <0x9f115> is corrupt (deleting the file broke the
filename->inode mapping, so it's just reporting the inode now). Either something still has the
file open or the metadata just needs to be cleaned up (which a scrub should do)."
"Normally, the path and name of the file with the error would be displayed, the <0x80> suggests
the corrupted file was deleted (before or after the error). It is a reference to the indirect
block that contained the file. This suggests that no active files were corrupted, just a file
that was already deleted, or has since been deleted."
pool: ITSoft
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://illumos.org/msg/ZFS-8000-8A
scan: scrub repaired 0 in 0h12m with 2 errors on Sun Jul 27 00:12:58 2014
config:
NAME STATE READ WRITE CKSUM
ITSoft ONLINE 0 0 2
gptid/6358bf65-f6ea-11e3-9135-080027eb8f88 ONLINE 0 0 0
errors: Permanent errors have been detected in the following files:
ITSoft:<0xab>
ITSoft:<0xae>
So once the damage has been done I had to repair it.
zpool scrub ITSoft
This will take some time so check the status zpool status -v to see the progress.
pool: ITSoft
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://illumos.org/msg/ZFS-8000-9P
scan: scrub repaired 0 in 0h12m with 0 errors on Thu Aug 14 00:30:25 2014
config:
NAME STATE READ WRITE CKSUM
ITSoft ONLINE 0 0 0
gptid/6358bf65-f6ea-11e3-9135-080027eb8f88 ONLINE 0 0 89
errors: No known data errors
And just in case another clear:
zpool clear -F ITSoft
End result:
pool: ITSoft
state: ONLINE
scan: scrub repaired 0 in 0h12m with 0 errors on Thu Aug 14 00:30:25 2014
config:
NAME STATE READ WRITE CKSUM
ITSoft ONLINE 0 0 0
gptid/6358bf65-f6ea-11e3-9135-080027eb8f88 ONLINE 0 0 0
errors: No known data errors
References:
http://serverfault.com/questions/581351/zfs-checksum-errors-what-files-are-affected
http://serverfault.com/questions/576898/clear-a-permanent-zfs-error-in-a-healthy-pool
http://www.retrospekt.dk/2011/08/zfs-drive-replacement/
