In order to back up the ZFS root pool on my laptop I plug in a USB hard disk 
and attach slice 0 on it as a mirror to the slice on the laptop's internal hard 
disk. Sometimes after a while the resilvering will stop and zpool status report 
this:

and...@grissom:~# zpool status
  pool: rpool
 state: DEGRADED
status: One or more devices has been removed by the administrator.
        Sufficient replicas exist for the pool to continue functioning in a
        degraded state.
action: Online the device using 'zpool online' or replace the device with
        'zpool replace'.
 scrub: resilver in progress for 0h14m, 70.86% done, 0h6m to go
config:

        NAME          STATE     READ WRITE CKSUM
        rpool         DEGRADED     0     0     0
          mirror-0    DEGRADED     0     0     0
            c2t0d0s0  ONLINE       0     0     0
            c5t0d0s0  REMOVED      0     0     0  5.02G resilvered

errors: No known data errors

c5t0d0s0 being the USB hard disk. The "format" command gets stuck looking for 
disks once this happens, until after a few minutes when I get odd noises from 
the drive, and it then sounds like it is spinning back up. Once it does ZFS 
noticed it has returned and continues resilvering. Here is the output of the 
format command showing the device paths:

AVAILABLE DISK SELECTIONS:
       0. c2t0d0 <DEFAULT cyl 5097 alt 2 hd 255 sec 63>
          /p...@0,0/pci1179,1...@1f,2/d...@0,0
       1. c5t0d0 <drive type unknown>
          /p...@0,0/pci1179,1...@1a,7/h...@6/stor...@3/d...@0,0
Specify disk (enter its number): 

Attached is the output of prtconf -v. The system is a Tecra M10 laptop. How can 
I find out what is going on here? The disk may be suspect, but it would be nice 
to know why it is getting reported as "disk has gone away".

Thanks

Andrew.
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