I'm sure lots of you have RAID5's setup, I know that we just went through a RAID5 nightmare on a 4TB array... Lost a drive, then the hardware raid controller wouldn't accept a disk, and recommended we "delete the volume" ............
This led to huge downtime, a massive rsync, and a rebuild of the whole array, then a copy back. No fucking fun.
http://blogs.zdnet.com/storage/?p=162