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About: Capacity optimization     Goto   Sponge   NotDistinct   Permalink

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Capacity optimization is a general term for technologies used to improve storage use by shrinking stored data. Primary technologies used for capacity optimization are data deduplication and data compression. These are delivered as software or hardware, integrated with storage systems or delivered as standalone products. Deduplication algorithms look for redundancy in sequences of bytes across comparison windows. Typically using cryptographic hash functions as identifiers of unique sequences, sequences are compared to the history of other such sequences, and where possible, the first uniquely stored version of a sequence is referenced rather than stored again. Different methods for selecting data windows include 4KB blocks to full-file comparisons known as single-instance storage (SIS).