RAID Level 5: Rotating Parity

This lesson presents RAID level 5, an improvement over level 4, and analyzes it with respect to the capacity, reliability, and performance.

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To address the small-write problem (at least, partially), Patterson, Gibson, and Katz introduced RAID-5. RAID-5 works almost identically to RAID-4, except that it rotates the parity block across drives. Look at the figure given below:

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