Method and apparatus for flexible buffers in an XOR engine
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United States of America Patent
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Jan 13, 2015
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N/A
app pub date -
Jan 23, 2013
filing date -
Apr 8, 2008
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Abstract
A method and apparatus uses a flexible buffering scheme in an XOR engine to generate checksums, allowing a user to recover data when a disk drive partly or completely fails. An XOR engine may include three or more arithmetic units and three or more local result buffers, which may be used to generate a combination of any of a “P” checksum, a “Q” checksum, and an unmodified copy of the user data, in a single read. The local result buffers and arithmetic units allow the use of multiple Galois field Multiply coefficients so that multiple distinct “Q” checksums may be generated with only one read of the user data.
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