zpool replace problem

Scenario.
Disk from pool1 failed. It was replaced with a new one, with appropriate cfgadm -c unconfigure and cfgadm -c configure commands. Process of resilvering has been completed, but there's still the unavailable device within a pool status. Any try to take a device offline causes the scrub process to start again.

thumper [~]# zpool status -v pool1
  pool: pool1
 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, 2,32% done, 28h7m to go
config:

        NAME            STATE     READ WRITE CKSUM
        pool1           DEGRADED     0     0     0
          raidz2        DEGRADED     0     0     0
            c7t0d0p0    ONLINE       0     0     0
            c6t0d0p0    ONLINE       0     0     0
            c7t4d0p0    ONLINE       0     0     0
            c6t4d0p0    ONLINE       0     0     0
            c1t0d0p0    ONLINE       0     0     0
            c0t0d0p0    ONLINE       0     0     0
            c1t4d0p0    ONLINE       0     0     0
            c0t4d0p0    ONLINE       0     0     0
            c5t1d0p0    ONLINE       0     0     0
            c4t1d0p0    ONLINE       0     0     0
            c5t5d0p0    ONLINE       0     0     0
            c4t5d0p0    ONLINE       0     0     0
            c7t1d0p0    ONLINE       0     0     0
            c6t1d0p0    ONLINE       0     0     0
            spare       DEGRADED     0     0     0
              c7t5d0p0  UNAVAIL      0     0     0  cannot open
              c1t3d0p0  ONLINE       0     0     0
            c6t5d0p0    ONLINE       0     0     0
            c1t1d0p0    ONLINE       0     0     0
            c0t1d0p0    ONLINE       0     0     0
            c1t5d0p0    ONLINE       0     0     0
            c0t5d0p0    ONLINE       0     0     0
        spares
          c1t3d0p0      INUSE     currently in use
          c0t3d0p0      AVAIL   

errors: No known data errors

Solution
Do exactly the same what has been done with a disk from the system point of view.
Replace it in place.

thumper [~]# zpool replace pool1 c7t5d0p0 c7t5d0p0


After resilver period of time:

thumper [~]# zpool status -v pool1
  pool: pool1
 state: ONLINE
 scrub: resilver completed with 0 errors on Thu May 14 17:08:20 2009
config:

        NAME          STATE     READ WRITE CKSUM
        pool1         ONLINE       0     0     0
          raidz2      ONLINE       0     0     0
            c7t0d0p0  ONLINE       0     0     0
            c6t0d0p0  ONLINE       0     0     0
            c7t4d0p0  ONLINE       0     0     0
            c6t4d0p0  ONLINE       0     0     0
            c1t0d0p0  ONLINE       0     0     0
            c0t0d0p0  ONLINE       0     0     0
            c1t4d0p0  ONLINE       0     0     0
            c0t4d0p0  ONLINE       0     0     0
            c5t1d0p0  ONLINE       0     0     0
            c4t1d0p0  ONLINE       0     0     0
            c5t5d0p0  ONLINE       0     0     0
            c4t5d0p0  ONLINE       0     0     0
            c7t1d0p0  ONLINE       0     0     0
            c6t1d0p0  ONLINE       0     0     0
            c7t5d0p0  ONLINE       0     0     0
            c6t5d0p0  ONLINE       0     0     0
            c1t1d0p0  ONLINE       0     0     0
            c0t1d0p0  ONLINE       0     0     0
            c1t5d0p0  ONLINE       0     0     0
            c0t5d0p0  ONLINE       0     0     0
        spares
          c1t3d0p0    AVAIL   
          c0t3d0p0    AVAIL   

errors: No known data errors

Voila!