[zfs-discuss] Help importing pool with "offline" disk

[Carson Gaspar]

Carson Gaspar wrote:

>> I'm booted back into snv118 (booting with the damaged pool disks 
>> disconnected so the host would come up without throwing up). After hot 
>> plugging the disks, I get:
>>
>> bash-3.2# /usr/sbin/zdb -eud media
>> zdb: can't open media: File exists
>>
> OK, things are now different (possibly better?):
> 
> bash-3.2# /usr/sbin/zpool status media
>   pool: media
>  state: FAULTED
> status: One or more devices could not be opened.  There are insufficient
>         replicas for the pool to continue functioning.
> action: Attach the missing device and online it using 'zpool online'.
>    see: http://www.sun.com/msg/ZFS-8000-3C
>  scrub: none requested
> config:
> 
>         NAME        STATE     READ WRITE CKSUM
>         media       FAULTED      0     0     1  corrupted data
>           raidz1    DEGRADED     0     0     6
>             c7t5d0  UNAVAIL      0     0     0  cannot open
>             c7t2d0  ONLINE       0     0     0
>             c7t4d0  ONLINE       0     0     0
>             c7t3d0  ONLINE       0     0     0
>             c7t0d0  ONLINE       0     0     0
>             c7t7d0  ONLINE       0     0     0
>             c7t1d0  ONLINE       0     0     0
>             c7t6d0  ONLINE       0     0     0
> 
> I suspect that an uberblock rollback might help me - googling all the 
> references now, but if someone has any advice, I'd be grateful.

And I'm afraid I just did something foolish. zdb wasn't working, so I tried 
exporting the pool. Now I'm back to:

bash-3.2# /usr/sbin/zpool import
   pool: media
     id: 4928877878517118807
  state: UNAVAIL
status: One or more devices are missing from the system.
action: The pool cannot be imported. Attach the missing
         devices and try again.
    see: http://www.sun.com/msg/ZFS-8000-3C
config:

         media       UNAVAIL  insufficient replicas
           raidz1    UNAVAIL  insufficient replicas
             c7t5d0  UNAVAIL  cannot open
             c7t2d0  ONLINE
             c7t4d0  ONLINE
             c7t3d0  ONLINE
             c7t0d0  OFFLINE
             c7t7d0  ONLINE
             c7t1d0  ONLINE
             c7t6d0  ONLINE

Can anyone help me get c7t0d0 "ONLINE" and roll back the uberblocks so I can 
import the pool and save my data?

-- 
Carson