Dear List,

I am struggling with a storage pool on a server, where I would like to offline 
a device for replacement. The pool consists of two-disk stripes set up in 
mirrors (yep, stupid, but we were running out of VDs on the controller at the 
time, and that's where we are now...).

Here's the pool config:

root@storage:~# zpool status -v tank
  pool: tank
 state: ONLINE
status: One or more devices has experienced an error resulting in data
        corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
        entire pool from backup.
 scan: resilvered 321G in 36h58m with 1 errors on Wed Apr  4 06:46:10 2012

        NAME          STATE     READ WRITE CKSUM
        tank          ONLINE       0     0     0
          mirror-0    ONLINE       0     0     0
            c1t14d0   ONLINE       0     0     0
            c1t15d0   ONLINE       0     0     0
          mirror-1    ONLINE       0     0     0
            c1t19d0   ONLINE       0     0     0
            c1t18d0   ONLINE       0     0     0
          mirror-2    ONLINE       0     0     0
            c1t20d0   ONLINE       0     0     0
            c1t21d0   ONLINE       0     0     0
          mirror-3    ONLINE       0     0     0
            c1t22d0   ONLINE       0     0     0
            c1t23d0   ONLINE       0     0     0
          mirror-4    ONLINE       0     0     0
            c2t2d0p7  ONLINE       0     0     0
            c2t3d0p7  ONLINE       0     0     0
          c2t2d0p11   ONLINE       0     0     0
          c2t3d0p11   ONLINE       0     0     0 

errors: Permanent errors have been detected in the following files:


What I would like to do is offline or detach c1t19d0, which the server won't 
let me do:

root@storage:~# zpool offline tank c1t19d0
cannot offline c1t19d0: no valid replicas

The errored file above is not important to me; it was part of a snapshot since 
deleted. Could that be related to this?

How can I find more information about why it simultaneously seems to think 
mirror-1 above is ok and broken?

Any ideas would be greatly appreciated. Thanks in advance for your kind 

Best regards

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