System and Method to Identify Changed Data Blocks
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United States of America Patent
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Issued Date -
Jan 1, 2009
app pub date -
Jun 28, 2007
filing date -
Jun 28, 2007
priority date (Note) -
Abandoned
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Abstract
Differences between data objects stored on a mass storage device can be identified quickly and efficiently by comparing block numbers stored in data structures that describe the data objects. Bit-by-bit or byte-by-byte comparisons of the objects' actual data need only be performed if the block numbers are different. Objects that share many data blocks can be compared much faster than by a direct comparison of all the objects' data. The fast comparison techniques can be used to improve storage server mirrors and database storage operations, among other applications.
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