Method and apparatus for preserving data integrity in a multiple disk raid organized storage system
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United States of America Patent
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Apr 2, 1996
Issued Date -
N/A
app pub date -
Feb 8, 1995
filing date -
Jun 29, 1993
priority date (Note) -
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Abstract
A data storage system using a RAID array and a logging process and apparatus that identifies a parity block that may not contain the proper parity for its associated data blocks and which prevents such inconsistent parity information from being used in the regeneration of unavailable data. A small fraction of the blocks of each disk are dedicated to storing parity metadata bits. The parity metadata is associated with the parity blocks and identifies whether or not each parity block contains the proper parity information for its associated data blocks or may contain invalid information. The data integrity of the RAID array is preserved by preventing the generation of undetected corrupt data.
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