I'm also very interested in this.  I'm having a lot of pain with status 
requests killing my resilvers.  In the example below I was trying to test to 
see if timf's auto-snapshot service was killing my resilver, only to find that 
calling zpool status seems to be the issue:

[EMAIL PROTECTED] ~]# env LC_ALL=C zpool status $POOL | grep " in progress"
 scrub: resilver in progress, 0.26% done, 35h4m to go

[EMAIL PROTECTED] ~]# env LC_ALL=C zpool status $POOL                      
  pool: pit
 state: DEGRADED
status: One or more devices could not be opened.  Sufficient replicas exist for
        the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using 'zpool online'.
   see: http://www.sun.com/msg/ZFS-8000-D3
 scrub: resilver in progress, 0.00% done, 484h39m to go
config:

        NAME          STATE     READ WRITE CKSUM
        pit           DEGRADED     0     0     0
          raidz2      DEGRADED     0     0     0
            c2t0d0    ONLINE       0     0     0
            c3t0d0    ONLINE       0     0     0
            c3t1d0    ONLINE       0     0     0
            c2t1d0    ONLINE       0     0     0
            spare     DEGRADED     0     0     0
              c3t3d0  UNAVAIL      0     0     0  cannot open
              c3t7d0  ONLINE       0     0     0
            c2t2d0    ONLINE       0     0     0
            c3t5d0    ONLINE       0     0     0
            c3t6d0    ONLINE       0     0     0
        spares
          c3t7d0      INUSE     currently in use

errors: No known data errors
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