About the MSDP fingerprint cache

NetBackup uses fingerprints to identify the file segments in the backup data. NetBackup writes only unique data segments to a Media Server Deduplication Pool. If a segment already is in storage, NetBackup does not store it again.

See About MSDP fingerprinting.

The storage server maintains an index cache of the fingerprints in RAM. For each backup job, a client requests a list of the fingerprints from its last backup from the server.

The NetBackup Deduplication Engine (spoold) loads a percentage of the fingerprints into the cache at startup. After startup, the Engine loads the remaining fingerprints.

You can configure the cache loading behavior.

See Configuring the MSDP fingerprint cache behavior.

You can also control the fingerprint cache seeding for clients.