urgent system suddenly boot failed due to ZFS:i/o error on FreeBSD 8.2

[suken woo]

Peter, in my situation, my zpool created under a RAID5 disk array
controller mfid0 and without spare disk settings. Is't the disk fault
issue?and how to resolve?

thanks

>This happened to me when my root pool had an active hot spare. I later
>tested it on a virtual machine, and even with non-spare disks added, the
>system did the same thing.

>Here is my PR:
>http://www.freebsd.org/cgi/query-pr.cgi?pr=167065

>kern/167065

>My solution was to boot on a DVD, and then "zpool detach" the bad disk
>(which converted the spare to a normal mirror).


>On 05/02/2012 02:03 PM, suken woo wrote:
> hi,lists
>    for some reasons I need restart system but it suddenly boot failed today.
> here is the error:
> ZFS: i/o error - all block copies unavailable
> ZFS: can't read object set for dataset 16
> Can't find root filesystem - giving up
> ZFS:unexcepted object set type 0
> ZFS:unexcepted object set type 0
>
> FreeBSD/i386 boot
> Default: zroot:/boot/kernel/kernel
> boot:
> ZFS:unexcepted object set type0
>
> FreeBSD/i386 boot
> Default: zroot:/boot/kernel/kernel
> boot: _
>
> any ideas to resolved it?
> thanks in advance
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