zfs discuss - Feb 2011 - 40MB repaired on a disk during scrub but no errors

Hey folks,

While scrubbing, zpool status shows nearly 40MB "repaired" but 0 in
each of the read/write/checksum columns for each disk.  One disk has
"(repairing)" to the right but once the scrub completes
there''s no mention that anything ever needed fixing.  Any idea what
would need to be repaired on that disk? Are there any other types of errors
besides read/write/checksum?  Previously, whenever a disk has required repair
during scrub it''s been either bad disk or loose cable connection and
it''s generated read, write and/or cksum errors.  It also irks me a
little that these repairs are only noted while the scrub is running. Once
it''s complete, it''s as if those repairs never happened.

If it''s relevant, this is a 6 drive mirrored pool with a single SSD for
L2Arc cache. Pool version 26 under Nexenta Core Platform 3.0 with a LSI 9200-16E
and SATA disks.

$ zpool status bigboy
  pool: bigboy
 state: ONLINE
 scan: scrub in progress since Sat Feb  5 02:22:18 2011
    3.74T scanned out of 3.74T at 141M/s, 0h0m to go
    37.9M repaired, 99.88% done
[-----config snip - all columns 0, one drive on the right has
"(repairing)"----]
errors: No known data errors

And then once the scrub completes:

$ zpool status bigboy
  pool: bigboy
 state: ONLINE
 scan: scrub repaired 37.9M in 7h42m with 0 errors on Sat Feb  5 10:04:53 2011
[-----config snip - all columns 0, the "(repairing)" note is now
gone----]
errors: No known data errors
-- 
This message posted from opensolaris.org