Concentrated parity technique for handling double failures and enabling storage of more than one parity block per stripe on a storage device of a storage array
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United States of America Patent
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Dec 1, 2009
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N/A
app pub date -
Jan 31, 2005
filing date -
Nov 13, 2001
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Abstract
A method for constructing an extended array of storage devices that enables storage of more than one parity block per stripe on a single device of the array is disclosed. Each device is divided into blocks. The blocks are organized into stripes across the devices, wherein each stripe contains a first number of parity blocks from each of a second number of parity storage devices of the array. Data blocks are stored on a third number of data storage devices, to thereby construct the array to enable storage of more than one parity block per stripe on a single device, wherein the extended array is recoverable from any one or two storage device failures.
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