f5771a61_12__Storage_Subsystem___Part_2__1
[0] · RAID 5 [1] 
A RAID 5 array consists of a logical disk composed of multiple physical disks that have data striped across the disks in sequential blocks (stripe units) in a manner similar to simple striping (RAID 0). However, the underlying physical disks have parity information spread throughout the disk array.RAID 5 read operations have characteristics similar to striping. However, small writes are much slower because each parity block that corresponds to the modified data block(s) must be updated.RAID 5 provides fault tolerance since data can be reconstructed from parity. RAID 5 can survive the loss of any one physical disk, as opposed to mirroring, which can survive the loss of multiple disks if the mirrored pair is not lost.RAID 5 is more cost efficient than mirroring because it requires only one additional disk per array, instead of double the total number of disks in an array.
Performance Tuning Windows 2012: Storage Subsystem - Part 2
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