zfs discuss - Apr 2010 - zfs-discuss Digest, Vol 54, Issue 153

Confirmed then that the issue was with the WD10EARS.
I swapped it out with the old one and things look a lot better:

  pool: datos
 state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
 scrub: resilver in progress for 0h3m, 0.02% done, 256h30m to go
config:

        NAME               STATE     READ WRITE CKSUM
        datos              DEGRADED     0     0     0
          raidz1-0         DEGRADED     0     0     0
            c12t1d0        ONLINE       0     0     0
            replacing-1    DEGRADED     0     0     0
              c12t0d0s0/o  OFFLINE      0     0     0
              c12t0d0      ONLINE       0     0     0  184M resilvered
            c12t2d0        ONLINE       0     0     0


Look now that the ETC is about 256h and with the EARS was more than 2500h.
When doing scrubs on this pool I usually saw that initially the performance
sucks but after some time it increases significantly reaching 30-50 MB/s.

Something else I want to add. When I wanted to replace the disk this last
time at had some resistance from ZFS because of this:

leandro at alexia:~$ zpool status
  pool: datos
 state: DEGRADED
 scrub: resilver completed after 0h0m with 0 errors on Sat Apr 24 17:34:03
2010
config:


        NAME               STATE     READ WRITE CKSUM
        datos              DEGRADED     0     0     0
          raidz1-0         DEGRADED     0     0     0
            c12t1d0        ONLINE       0     0     0
            replacing-1    DEGRADED     0     0     4
              c12t0d0s0/o  ONLINE       0     0     0  16.0M resilvered
              c12t0d0      OFFLINE      0     0     0
            c12t2d0        ONLINE       0     0     0

[] The pool had c12t0d0s0/o and just a simple replace wouldn''t work:

$ pfexec zpool replace datos c12t0d0
invalid vdev specification
use ''-f'' to override the following errors:
/dev/dsk/c12t0d0s0 is part of active ZFS pool datos. Please see zpool(1M).


[] The -f option neither worked:

$ pfexec zpool replace -f datos c12t0d0
invalid vdev specification
the following errors must be manually repaired:
/dev/dsk/c12t0d0s0 is part of active ZFS pool datos. Please see zpool(1M).


[] No way to detach the intruder:

$ pfexec zpool detach datos c12t0d0s0
cannot detach c12t0d0s0: no such device in pool


[] Well, maybe not with that name:

$ pfexec zpool detach datos c12t0d0s0/o
$ zpool status datos
  pool: datos
 state: DEGRADED
status: One or more devices has been taken offline by the administrator.
        Sufficient replicas exist for the pool to continue functioning in a
        degraded state.
action: Online the device using ''zpool online'' or replace the
device with
        ''zpool replace''.
 scrub: resilver completed after 0h0m with 0 errors on Sat Apr 24 17:34:03
2010
config:


        NAME         STATE     READ WRITE CKSUM
        datos        DEGRADED     0     0     0
          raidz1-0   DEGRADED     0     0     0
            c12t1d0  ONLINE       0     0     0
            c12t0d0  OFFLINE      0     0     0
            c12t2d0  ONLINE       0     0     0

errors: No known data errors


[] Now the replace will work:

$ pfexec zpool replace datos c12t0d0
$ zpool status datos
  pool: datos
 state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
 scrub: resilver in progress for 0h0m, 0.00% done, 177h22m to go
config:

        NAME               STATE     READ WRITE CKSUM
        datos              DEGRADED     0     0     0
          raidz1-0         DEGRADED     0     0     0
            c12t1d0        ONLINE       0     0     0
            replacing-1    DEGRADED     0     0     0
              c12t0d0s0/o  OFFLINE      0     0     0
              c12t0d0      ONLINE       0     0     0  19.5M resilvered
            c12t2d0        ONLINE       0     0     0

errors: No known data errors


[] By the time I''m writing this last lines the performance already
improved:

$ zpool status datos
  pool: datos
 state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
 scrub: resilver in progress for 0h23m, 0.30% done, 126h14m to go
config:

        NAME               STATE     READ WRITE CKSUM
        datos              DEGRADED     0     0     0
          raidz1-0         DEGRADED     0     0     0
            c12t1d0        ONLINE       0     0     0
            replacing-1    DEGRADED     0     0     0
              c12t0d0s0/o  OFFLINE      0     0     0
              c12t0d0      ONLINE       0     0     0  2.34G resilvered
            c12t2d0        ONLINE       0     0     0

errors: No known data errors


$ zpool iostat datos 5

                      capacity     operations    bandwidth
pool               alloc   free   read  write   read  write
-----------------  -----  -----  -----  -----  -----  -----
datos              2.27T   460G    134      1  9.62M  7.75K
  raidz1           2.27T   460G    134      1  9.62M  7.75K
    c12t1d0            -      -    118      0  4.80M      0
    replacing          -      -      0    135      0  4.82M
      c12t0d0s0/o      -      -      0      0      0      0
      c12t0d0          -      -      0    132      0  4.82M
    c12t2d0            -      -    106      0  4.84M      0
-----------------  -----  -----  -----  -----  -----  -----


Thanks for reading.  :)

Leandro.
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