Monitoring the deduplication rate

The deduplication rate is the percentage of data that was stored already. That data is not stored again.

NetBackup reports the rate of deduplication as follows:

Table: Deduplication activity field descriptions



cache hits

The percentage of time that the local fingerprint cache contained a record of the segment. The deduplication plug-in did not have to query the database about the segment.

CR sent

The amount of data that is sent from the deduplication plug-in to the component that stores the data. (In NetBackup, the NetBackup Deduplication Engine stores the data. In PureDisk, a content router stores the data.)

If the storage server deduplicates the data, it does not travel over the network. The deduplicated data travels over the network when the deduplication plug-in runs on a computer other than the storage server, as follows:

  • On a NetBackup client that deduplicates its own data (client-side deduplication).

  • On a fingerprinting media server that deduplicates the data. The plug-in on the fingerprinting server sends the data to the storage server, which writes it to a Media Server Deduplication Pool.

  • On a media server that then sends it to a PureDisk environment for storage. (In NetBackup, a PureDisk Storage Pool represents the storage of a PureDisk environment.)


The percentage of data that was stored already. That data is not stored again.


The amount of data that the deduplication plug-in scanned.

stream rate

The speed of the scan: The kilobytes of data that are scanned divided by how long the scan takes.