zfs discuss - Oct 2010 - scrub doesn''t finally finish?

Hi all,

I have issued a scrub on a pool, that consists of two independant FC raids. The
scrub has been running for approx. 25 hrs and then showed 100%, but
there''s still an incredible traffic on one of the FC raids going on,
plus zpool statuv -v reports that scrub is still running:


zpool status -v backupPool_01
  pool: backupPool_01
 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 for 26h45m, 100,00% done, 0h0m to go
config:

        NAME                     STATE     READ WRITE CKSUM
        backupPool_01            ONLINE       0     0     0
          c3t2100001378AC0271d0  ONLINE       0     0    26  2,11M repaired
          c3t2100001378AC026Ed0  ONLINE       0     0     0

errors: No known data errors

So, what is scrub still doing to the upper vdev? Is there anywhere where I can
get more information about what scrub is still doing?

Thanks,
budy
-- 
This message posted from opensolaris.org

Have you had a lot of activity since the scrub started?

I have noticed what appears to be extra I/O at the end of a scrub when activity
took place during the scrub.  It''s as if the scrub estimator does not
take the extra activity into account.
-- 
This message posted from opensolaris.org

Yes - that may well be. There was data going on to the device while scrub has
been running. Especially large zfs receives  had been going on.

I''d be odd if that was the case, though.

Cheers,
budy
-- 
This message posted from opensolaris.org

Seems like it''s really the case, that scrub doesn''t take
traffic that goes onto the zpool while it''s scrubbing away.

After some more time, the scrub finished and everything looks good so far.

Thanks,
budy
-- 
This message posted from opensolaris.org