I just bumped from:
FreeBSD 7.2-PRERELEASE #1: Wed Mar 18 00:55:27 PDT 2009
to:
FreeBSD 7.2-STABLE #2: Wed Jun 10 18:27:30 PDT 2009
I rebooted and my zpool was WHACK'd. I was getting these errors in
/var/log/messages:
Jun 11 16:54:55 crepe3 root: ZFS: vdev I/O failure, zpool=tank
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