Good Post by Matt Simmons (thank you)
Alright, my normal RAID-5 caveats stand here. Pretty much every RAID level other than 0 is better than a single parity RAID, until RAID goes away. If you care about your data and speed, go with RAID-10. If you’re cheap, go with RAID-6. If you’re cheap and you’re on antique hardware, or if you just like arguing about bits, keep reading about RAID-5.
Read on here