I get question about what configuration of redundant array of inexpensive disks (RAID) I use for my SQL Servers.
The answer is short is: RAID 10. Why? Excellent performance with Read and Write.
RAID 10 has advantage of both RAID 0 and RAID 1. RAID 10 uses all the drives in the array to gain higher I/O rates so more drives in the array higher performance. RAID 5 has penalty for write performance because of the parity in check. There are many article already written about them. If you are interested in reading more please refer book online.