Uniform and symmetric double failure correcting technique for protecting against two disk failures in a disk array
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United States of America Patent
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Aug 28, 2007
Grant Date -
May 26, 2005
app pub date -
Nov 24, 2003
filing date -
Nov 24, 2003
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Abstract
A uniform and symmetric, double failure-correcting technique protects against two or fewer disk failures in a disk array of a storage system. A RAID system of the storage system generates two disks worth of 'redundant' information for storage in the array, wherein the redundant information (e.g., parity) is illustratively derived from computations along both diagonal parity sets ('diagonals') and row parity sets ('rows'). Specifically, the RAID system computes row parity along rows of the array and diagonal parity along diagonals of the array. However, the contents of the redundant (parity) information disks interact such that neither disk contains purely (solely) diagonal or row redundancy information; the redundant information is generated using diagonal parity results in row parity computations (and vice versa).
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