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RAID-6 supports losing any two drives. The way this is done is by computing two syndromes, generally referred P and Q. The algebra used for this is the algebra of a Galois Field, GF(28). A smaller or larger field could also be used, however, a smaller field would limit the number of drives possible, and a larger field would require extremely large tables. GF(28) allows for a maximum of 257 drives, 255 (28 - 1) of which can be data drives; the reason for this is shown in the paper.

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Format:PDFSize:130 KB
Date:Jul 2008
Pages:10

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