I recently ran into this problem with ZFS:
1. I made a mistake by creating a zfs pool by using /dev/sdX definitions (rather than /dev/disk/by-uuid).
2. After the Ubuntu upgrade from Ubuntu 11.10 to Ubuntu 12.04, the hard drive device numbering, i.e. sda, sdb, etc., changed. Needless to say, the zfs pool did not work anymore.
The solution was to run:
zpool import -d /dev/disk/by-id
and then run zpool import [zpoolname] by name, as instructed by zfs.
If this does not resolve the issue, try to export the zpool and re-import it using the /dev/disk/by-id configuration, e.g.
zpool export [zpoolname]
zpool import -d /dev/disk/by-id [zpoolname] -f
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