Method and apparatus for managing data compression and integrity in a computer storage system
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United States of America Patent
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May 10, 2011
Grant Date -
Mar 12, 2009
app pub date -
Sep 11, 2007
filing date -
Sep 11, 2007
priority date (Note) -
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Abstract
A storage system stores discrete data units and corresponding metadata. The storage system receives data for storage, calculates a first hash value for the data, and identifies a set of compression conditions that correspond to a client ID associated with the data. When the compression conditions indicate that the data should be compressed, the data is compressed to create compressed data. Following compression of the data, the storage system calculates a second hash value for the compressed data, and stores the second hash value in the metadata, while also retaining the first hash value in the metadata. The storage system stores the compressed data, and deletes the uncompressed version of the data. An integrity check of the data stored in the storage system can be carried out periodically using the first or second hash values contained in metadata for each discrete data unit.
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