[gtuhl]

Agreed, hard drives fail constantly. I've had as many as 3 dead at a time while waiting for hot spares to rebuild in arrays as small as 24 drives. Dual drive failures have happened at least twice that I can remember off the top of my head in the last 3-4 years.

Usually running raid10 for performance reasons but when I don't need fast writes I use raid6 instead of raid5 for anything beyond 8 drives.