Not sure if this thread belongs here but I didnt find any better group.

It seems to bee a common opinion that RAID levels 0+1 (first stripe, then mirror) and level 1+0 (first mirror, then stripe) have better write/read performance and higher reliability than the more common RAID level 5 in a OLTP system.

The higher reliability is easy to understand, but can someone explain why read/write performance is better. Is it only because of parity calculations in RAID 5?