What is RAID LEVEL 4

Does not support multiple simultaneous write operations. Stripes data at a block level across several drives, with parity stored on one drive. The parity information allows recovery from the failure of any single drive. The performance of a level 4 array is very good for reads (the same as level 0). However, writes require that parity data be updated each time. This slows small random writes, in particular, though large writes or sequential writes are fairly fast. The cost per megabyte of a RAID 4 array can be low because only one drive in the array stores redundant data. Graphical representation of the RAID layout: Raid Level 4 Raid Level 4