ZFS jumps from slice to partition on upgrade (???)

[Rudy]

History for 'tank':
2008-01-17.23:07:08 zpool create tank mirror ad0s2 ad8s2
2008-01-17.23:40:35 zfs create -o quota=100g tank/test.monkeybrains.net
... many more creates/deletes ... then the zfs freakout ...
2009-06-11.16:43:33 zpool clear tank
2009-06-11.16:43:59 zpool scrub tank
2009-06-11.16:48:58 zpool scrub -s tank
2009-06-11.16:54:56 zpool detach tank ad6s2c
2009-06-11.16:55:57 zpool attach tank ad0s2 ad6s2


Maybe having the device jump from ad8s2 to ad6s2 freaked out zfs?

Any thoughts, or will the Internet tube swallow this post silently?

Rudy