zfs discuss - Dec 2007 - Faulted raidz1 shows the same device twice ?!?

zpool status shows:
        NAME         STATE     READ WRITE CKSUM
        external     DEGRADED     0     0     0
          raidz1     DEGRADED     0     0     0
            c18t0d0  ONLINE       0     0     0
            c18t0d0  FAULTED      0     0     0  corrupted data

I used to have a normal raidz1 with devices c18t0d0 and c19t0d0 but c19t0d0
broke. So, I plugged a new drive in its slot.  But attach and replace give
errors:

# zpool replace external c19t0d0
cannot replace c19t0d0 with c19t0d0: no such device in pool

# zpool attach external c18t0d0 c19t0d0
cannot attach c19t0d0 to c18t0d0: can only attach to mirrors and top-level disks

Why does zpool status show the same drive twice?  How can I clear the fault and
attach a new good drive in c19t0d0?

Any help appreciated,
- Jeff
 
 
This message posted from opensolaris.org

To resolve this issue you need to run:

# zdb -l /dev/dsk/c18t0d0

# zpool export external
# zpool import external

# zpool clear external
# zpool scrub external
# zpool clear external


(I do not have specific answers to your questions at this time, only a fix.)
 
 
This message posted from opensolaris.org

Genius!  The export/import worked great.  With the new drive plugged in, I got:
# zpool status
          raidz1                  DEGRADED     0     0     0
            c18t0d0               ONLINE       0     0     0
            17017229752965797825  FAULTED      0     0     0  was
/dev/dsk/c18t0d0s0

Then I was able to replace:
# zpool replace external 17017229752965797825 c19t0d0

After resilvering, I''m up and running!

(For the question of where it was showing c18t0d0, it''s interesting
that it thought the second drive was c18t0d0s0.  Can you have a raidz1 with
c18t0d0 and c18t0d0s0?)
 
 
This message posted from opensolaris.org