RAID Level 4: Saving Space With Parity

Let's discuss RAID level 4 and analyze it with respect to the capacity, reliability, and performance.

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We now present a different method of adding redundancy to a disk array known as parity. Parity-based approaches attempt to use less capacity and thus overcome the huge space penalty paid by mirrored systems. They do so at a cost, however: performance.

Given below is an example five-disk RAID-4 system.

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