Comment by mililani

This may be a little off topic, but I used to think RAID 5 and RAID 6 were the best RAID configs to use. It seemed to offer the best bang for buck. However, after seeing how long it took to rebuild an array after a drive failed (over 3 days), I'm much more hesitant to use those RAIDS. I much rather prefer RAID 1+0 even though the overall cost is nearly double that of RAID 5. It's much faster, and there is no rebuild process if the RAID controller is smart enough. You just swap failed drives, and the RAID controller automatically utilizes the back up drive and then mirrors onto the new drive. Just much faster and much less prone to multiple drive failures killing the entire RAID.