RAID 5
RAID 5 is the only one of the original parity RAID definitions still in heavy use today. RAID 2 was defined for a specific type of disk technology that has become obsolete. RAID 3 synchronizes I/O operations over multiple members, but that approach has turned out to be useful only for single-application environments, not for multitasking, multiprocessing environments that characterize open-systems computing. RAID 4 writes strips of data independently to unsynchronized members and writes corresponding parity strips to a dedicated parity member. The dedicated parity member turns out to be a performance bottleneck in most cases.
NOTE
Network Appliance Filer network attached storage (NAS) systems are an example of RAID 4 implementations that ...
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