RAID Storage Systems Overview
RAID was first described by Garth Gibson, Randy Katz, and Dave Patterson of UC Berkeley in the late 1980s as a 'Redundant Array of Inexpensive Disks'. It has now become a blanket term for data storage schemes that implement redundancy and parallelism for better fault tolerance and input/output (I/O) performance than a single disk drive or 'Just a Bunch Of Disks' (JBOD). RAID commonly represents a system consisting of many storage disks that are accessed by servers through high speed Ethernet or Fiber Channel media. Disk drive I/O speed is the primary performance bottleneck in most storage systems. Generally, RAID Systems use parallel disk access and cache memories to increase the read and write performance, while using redundant disks for failure recovery to enhance fault tolerance.
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