Strange ZFS pool failure after updating kernel v6->v13

[Adam McDougall]

Yan V. Batuto wrote:
> Hello!
>
> RAID-Z v6 works OK with 7.2-RELEASE, but it fails with recent 7.2-STABLE.
> --------------------------------------------------
> # zpool status bigstore
>   pool: bigstore
>  state: ONLINE
>  scrub: scrub completed with 0 errors on Fri Jun  5 22:28:19 2009
> config:
>
>         NAME        STATE     READ WRITE CKSUM
>         bigstore    ONLINE       0     0     0
>           raidz1    ONLINE       0     0     0
>             ad4     ONLINE       0     0     0
>             ad6     ONLINE       0     0     0
>             ad8     ONLINE       0     0     0
>             ad10    ONLINE       0     0     0
>
> errors: No known data errors
> --------------------------------------------------
> After cvsup to 7-STABLE, usual procedure of rebuilding kernel and
> world, and reboot pool is failed.
> It's quite strange that now pool consists of ad8, ad10, and again ad8,
> ad10 drives instead of ad4, ad6, ad8, ad10.
>
> I removed additional disk controller few weeks ago, so raid-z
> originally was created as ad8+ad10+ad12+ad14, and then
> it appeared to be ad4+ad6+ad8+ad10. It was not a trouble for zfs v6,
> but, probably, something is wrong here in zfs v13.
> --------------------------------------------------
> # zpool status bigstore
> pool: bigstore
>  state: UNAVAIL
> status: One or more devices could not be used because the label is missing
>         or invalid.  There are insufficient replicas for the pool to continue
>         functioning.
> action: Destroy and re-create the pool from a backup source.
>    see: http://www.sun.com/msg/ZFS-8000-5E
>  scrub: none requested
> config:
>
>         NAME        STATE     READ WRITE CKSUM
>         bigstore    UNAVAIL      0     0     0  insufficient replicas
>           raidz1    UNAVAIL      0     0     0  insufficient replicas
>             ad8     FAULTED      0     0     0  corrupted data
>             ad10    FAULTED      0     0     0  corrupted data
>             ad8     ONLINE       0     0     0
>             ad10    ONLINE       0     0     0
>   
Please try:
zpool export bigstore
zpool import bigstore

This should make it find the right hard drives if they are present, 
otherwise should give a more informative error.