Deduplication is a file system feature that incorporates enhancements to the file system and the application layer. Deduplication features the ability to reduce redundancy in stored data blocks. All data in the specified file system is scanned at intervals and duplicate blocks are removed, resulting in reclaimed disk space. All dedupe activity and the elimination of redundant blocks is transparent to the user.
Base deduplication is enabled by default and does not require a license key. This is a dedupe feature with a single SHA-256 engine, capable of indexing data at a rate of up to 120 MB per second.
Premium deduplication is a licensed feature and must be installed before deduplication can be performed. This is a dedupe feature with four SHA-256 engines, capable of indexing data at a much faster rate. Contact your Hitachi representative for more information.
For license key information, see the Server and Cluster Administration Guide.