Capacity optimization

Capacity optimization is a general term for technologies used to improve storage use by shrinking stored data. The primary technologies used for capacity optimization are deduplication and data compression. These solutions are delivered as software or hardware solution, integrated with existing 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 solutions use different methods for selecting data windows, from 4KB blocks to full-file comparisons known as Single Instance Storage or SIS.