STORAGE APPARATUS AND DATA MANAGEMENT METHOD
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United States of America Patent
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Issued Date -
May 21, 2015
app pub date -
Aug 24, 2012
filing date -
Aug 24, 2012
priority date (Note) -
Abandoned
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Abstract
A control unit of a storage apparatus divides received data into one or more chunks and compresses the divided chunk(s); and regarding the chunk whose compressibility is equal to or lower than a threshold value, the control unit does not store the chunk in the first storage area, but calculates a hash value of the compressed chunk, compares the hash value with a hash value of another data already stored in the second storage area and executes first deduplication processing; and regarding the chunk whose compressibility is higher than the threshold value, the control unit stores the compressed chunk in the first storage area, reads the compressed chunk from the first storage area, calculates a hash value of the compressed chunk, compares the relevant hash value with a hash value of another data already stored in the second storage area, and executes secondary deduplication processing.
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