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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Jul 4, 2006
Grant Date -
Jul 3, 2003
app pub date -
Dec 28, 2001
filing date -
Dec 28, 2001
priority date (Note) -
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Abstract
A technique efficiently corrects multiple storage device failures in a storage array using a combination of a single diagonal parity group and multiple row parity groups. The storage array includes a plurality of concatenated sub-arrays, wherein each sub-array includes a set of data storage devices and a parity storage device. Each row parity group is associated with a sub-array of the array. The array further includes a global parity storage device holding diagonal parity computed across the concatenation of the sub-arrays. Instead of requiring that each parity group contain both a row parity device and a diagonal parity device, the array is composed of a collection of row parity groups. Diagonal parity is calculated across the full array.
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