hmm ok, the replace with the existing drive still in place wasn't the best 
option...it's replacing, but very slowly as it's reading from that sus disk:

  pool: storage
 state: ONLINE
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, 0.00% done, 2895h58m to go
config:

        NAME           STATE     READ WRITE CKSUM
        storage        ONLINE       0     0     0
          raidz1       ONLINE       0     0     0
            c3t0d0     ONLINE       0     0     0
            replacing  ONLINE       0     0     0
              c3t1d0   ONLINE       0     0     0
              c6d1p0   ONLINE       0     0     0  13.3M resilvered
            c3t2d0     ONLINE       0     0     0
            c3t3d0     ONLINE       0     0     0


t...@opensolaris:~$ iostat -xnz 1
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
   12.2    5.4  845.4  105.5  0.8  0.3   45.7   14.4   9  15 c0d0
    0.2    8.9    1.8   36.2  0.0  0.0    4.4    1.1   0   1 c6d1
    1.5    1.1   89.7    3.4  0.1  0.0   24.0    4.7   1   1 c3t0d0
    1.5    1.1   89.6    3.4  5.2  0.5 1986.6  196.2  51  52 c3t1d0
    1.6    1.3   92.1    3.2  0.1  0.0   19.0    3.8   1   1 c3t2d0
    1.5    1.2   89.0    2.8  0.1  0.0   21.3    4.4   1   1 c3t3d0
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    0.0    0.0    0.0 13.0  1.0    0.0    0.0 100 100 c3t1d0
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    2.0    0.0   85.5  0.0  0.0    0.0    1.1   0   0 c6d1
    1.0    0.0   85.5    0.0 12.8  1.0 12838.7  999.7 100 100 c3t1d0
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    0.0    0.0    0.0 12.0  1.0    0.0    0.0 100 100 c3t1d0


can I stop the resilver or maybe shutdown the box to disconnect the dead disk ?
is it ok to reboot the box while it's doing a resilver ?  ie: will it continue 
when it's back up ?
-- 
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