Correcting multiple block data loss in a storage array using a combination of a single diagonal parity group and multiple row parity groups
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United States of America Patent
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Oct 14, 2008
Grant Date -
Oct 26, 2006
app pub date -
Apr 12, 2006
filing date -
Dec 28, 2001
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Abstract
A method for correcting double failures in a storage array has the following steps. A storage array is organized as a plurality of concatenated sub-arrays, each sub-array including a set of data storage devices and a row parity storage device. Row parity is computed for each row of each sub-array. The row parity of a particular sub-array is stored on a row parity storage device of the particular sub-array. A diagonal parity is computed across the concatenated sub-arrays. A double storage device failure is corrected using both the sub-array row parity and the diagonal parity.
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