De-duplication of data in a data processing system
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United States of America Patent
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May 24, 2011
Grant Date -
Jul 15, 2004
app pub date -
Dec 23, 2003
filing date -
Apr 11, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
In a data processing system, a method includes deleting a particular copy of a data item when at least one other copy of the data item is available. The presence of another copy of the data item is determined, at least in part, based on an identifier for the data item, the identifier having been computed using all of the data in the data item and only the data in the data item, wherein two identical data items in the data processing system will have identical identifiers. The particular copy of the data item may be deleted if another copy of the data is determined to be present on another processor in the system or on the same processor. The identifier of the data item is computed using a function such as a message digest or hash function which may be: MD4, MD5, or SHA.
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