2012-05-12 15:52, Jim Klimov wrote:
2012-05-11 14:22, Jim Klimov wrote:
What conditions can cause the reset of the resilvering
process? My lost-and-found disk can't get back into the
pool because of resilvers restarting...


Guess I must assume that the disk is dying indeed, losing
connection or something like that after a random time (my
resilvers restart after 15min-5hrs), and at least a run of
SMART long diags is in order, while the pool would try to
rebuild onto another disk (the hotspare) instead of trying
to update this one which was in the pool.

Well, I decided to bite the bullet and kick the original
disk from the pool after replacing it with the spare, and
to say the least, speed prognosis looks a lot better now,
about two times better in zpool's resilver progress/estimate
and by up to an order of magnitude better at iostat speeds:

Sat May 12 16:05:44 MSK 2012
                    extended device statistics
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
  571.0    5.4 52488.4    5.1  0.5  3.8    0.9    6.6  11  77 c0t1d0
  589.4    5.6 52630.5    5.3  1.6  2.2    2.6    3.7  32  75 c4t3d0
  562.0    6.2 52552.9    5.8  0.4  4.1    0.8    7.1   9  80 c6t5d0
  582.4    6.2 52554.5    5.8  1.5  2.4    2.5    4.0  29  76 c7t6d0
    0.0  591.0    0.0 52081.8  1.9  6.1    3.3   10.3  23  91 c5t6d0

Sat May 12 16:10:09 MSK 2012
                    extended device statistics
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
  248.4    0.1 14190.5    0.0  0.0  6.9    0.0   27.9   0  87 c0t1d0
  247.9    0.1 14188.3    0.0  0.0  6.9    0.0   27.7   0  87 c4t3d0
  248.3    0.1 14193.2    0.0  0.0  6.9    0.0   27.7   0  87 c6t5d0
  245.1    0.1 14195.4    0.0  0.0  7.1    0.0   28.9   0  88 c7t6d0
    0.1  214.4    0.6 13698.7  0.0  9.6    0.0   44.6   0  97 c5t6d0

Disk replacement was as follows: I kicked the hotspare from
the resilvering pool and reattached it, then I kicked the
original disk from the pair and attached it as a new hotspare.
Excerpt from the zpool history follows:


2012-05-12.10:13:03 zpool detach pond c5t6d0 [user root on thumper:global]

2012-05-12.15:58:31 [internal vdev attach txg:91072933] spare in vdev=/dev/dsk/c5t6d0s0 for vdev=/dev/dsk/c1t2d0s0 [user root on thumper] 2012-05-12.15:59:08 zpool replace pond c1t2d0 c5t6d0 [user root on thumper:global]

2012-05-12.16:02:06 zpool detach pond c1t2d0 [user root on thumper:global]

2012-05-12.16:04:35 zpool add pond spare c1t2d0 [user root on thumper:global]


Hope this helps us, thanks for listening,
//Jim Klimov
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