Your RAID configuration is only as good as your controller. The LSI card in my sixgeeks.org server crapped out over a period of several weeks, taking two drives with it, fortunately not at the same time. But it did take the entire bus down randomly during these failures, sending me down to the datacenter several times a week. DOH!
After replacing the bad disks and the card (all under warranty), I did see some data corruption, so I reinitialized the RAID config, reloaded the server, and restored from backups. I'm happy to report that all is well again.
Moral of the story? RAID does not protect you from data loss -- only backups can do that. Take it from a career sysadmin. :)
