Switch / driver reset gave me a totally different lun, one that was in use, on another Sun box.
I newfsed a mounted partition, in the middle of a Friday afternoon, on a live production system.
fsck wasn't happy.
Current users were unhappier.
The sysadmin that I hired that week, his 1st job out of college, had it dropped in his lap.
I took the weekend off, and everything was good on Monday.
Damn, I love that guy.