XigmaNAS

I have used my NAS with a ZFS pool of 5 disks for a few months now and today the pool
was suddenly gone. I tried the following:

> zpool import

pool: store
id: 6536123915084221822
state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:

store ONLINE
raidz2-0 ONLINE
ada0 ONLINE
ada1 ONLINE
ada2 ONLINE
ada3 ONLINE
ada4 ONLINE

> zpool import store
cannot import 'store': pool may be in use from other system
use '-f' to import anyway

> zpool import -f store
cannot import 'store': I/O error
Destroy and re-create the pool from
a backup source.

Also, I see no error on the disks in the SMART logs (short and extended tests).
Any suggestions appreciated.

googling a bit appears to be metadata corruption, please read other post and try to recover as many data as posible or recreate the pool and restore from backup if you have one:

https://www.google.es/search?q=cannot+i ... kup+source

I did google quite a bit and I found no real solution (to recover any data what so ever from the pool) so I have already started to assemble the backups. I quite curious tough to what caused the metadata corruption.