The data deduplication function deletes duplicate copies of data written to different addresses in the same pool and maintains only a single copy of the data at one address. Deduplication is enabled on a Dynamic Provisioning pool and then on the desired DP-VOLs in the pool. When deduplication is enabled, data that has multiple copies between data on DP-VOLs assigned to that pool is removed.
When you create DP-VOLs with the deduplication function enabled, deduplication system data volumes (fingerprint and data store) are automatically created. The deduplication system data volumes (fingerprint) store the search table for searching the deduplicated data. For one pool, deduplication system data volumes (fingerprint) are created. The deduplication system data volumes (data store) store the source data for duplicated data. For one pool, 4 deduplication system data volumes (data store) are created. If all DRD-VOLs are deleted, all deduplication system data volumes are deleted automatically.
If the compression accelerator feature applies to a DRD-VOL whose capacity saving setting is Deduplication and Compression, the compression accelerator feature applies to the duplicated data on all DRD-VOLs that are created from the pool containing the DRD-VOL.
When initializing duplicated data is performed, the compression accelerator settings between the V-VOL with deduplication and compression enabled belonging to the initialized pool and the deduplication system data volume (data store) might become inconsistent. After the initialization is complete, verify the compression accelerator settings, and then if the settings become inconsistent, change the compression accelerator settings for the deduplication system data volume (data store).