RAID
From Kb_JMY(晉明夷)
RAID, Redundant Array of Inexpensive Disks or Redundant Array of Independent Disks, is a technology that provides increased storage reliability through redundancy, combining multiple low-cost, less-reliable disk drives components into a logical unit where all drives in the array are interdependent.
RAID is now used as an umbrella term for computer data storage schemes that can divide and replicate data among multiple hard disk drives. The different schemes or architectures are named by the word RAID followed by a number (e.g. RAID 0, RAID 1). RAID's various designs involve two key design goals: increase data reliability and/or increase input/output performance.
- RAID 0 -- File stripping (Block-level) for faster access /2drives min.
- RAID 1 -- Mirroring for boosted reliability /2drives min.
- RAID 2 -- File striping (Bit-level) with dedicated Hamming-code parity. /3drives min.
