Technique for correcting multiple storage device failures in a storage array
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United States of America Patent
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Mar 24, 2009
Grant Date -
Oct 5, 2006
app pub date -
Jun 2, 2006
filing date -
Mar 8, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for storing data for correction of multiple data storage failures in a storage array is presented. The storage array is organized as a plurality of sub-arrays, each sub-array including a set of data storage devices and a plurality of local parity storage blocks, each of the plurality of local storage blocks storing parity information for a corresponding sub-array. A plurality of diagonal parity sets is computed, one diagonal parity set for each sub-array. A global diagonal parity is computed by logically combining together a plurality of the diagonal parity sets. The global diagonal parity is stored in a plurality of global diagonal parity storage blocks.
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