When you get to RAID levels 4 and 5, you are dealing with extremely sophisticated arrays that employ a number of techniques to increase read/write performance and redundancy in order to protect mission critical data. Let's take a look at these RAID levels, which offer performance benefits over RAID 2 and RAID 3 arrays, and redundancy benefits over a RAID 1 array.
Level 4 RAID Arrays
Level 4 RAID is one of the more sophisticated of the original 5 RAID levels originally devised by technology experts at Berkeley. Level 5 RAID, though, with distributed parity, has it beat in terms of write performance and data redundancy.