Technique for efficiently organizing and distributing parity blocks among storage devices of a storage array
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United States of America Patent
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Jul 8, 2008
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N/A
app pub date -
Jan 31, 2005
filing date -
Jan 31, 2005
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Abstract
A method for organizing and distributing parity blocks among storage devices of an array coupled to a storage system is disclosed. First the array is configured with a predetermined number of devices. Each device is divided into blocks. The blocks are organized into stripes, wherein each stripe contains at least one first device that holds at least one row parity block, at least one second device that holds at least one diagonal parity block, and a plurality of devices that hold data blocks. An extra parity block is appended within each stripe. Each data block is assigned to one row parity set and one diagonal parity set, such that any one or any combination of two devices can fail concurrently and data on the failed devices can be reconstructed.
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