Symantec 7 manual About NetBackup Client Deduplication

24Planning your deployment

About NetBackup Client Deduplication

the installation fails. To upgrade a NetBackup media server that hosts a PDDO agent, you must first remove the PDDO agent.

See the NetBackup PureDisk Deduplication Option (PDDO) Guide.

Deduplication within each media server deduplication node is supported; global deduplication between nodes is not supported.

About NetBackup Client Deduplication

With normal deduplication, the client sends the full backup data stream to the media server. The deduplication engine on the media server processes the stream, saving only the unique segments.

With NetBackup Client Deduplication, the client hosts the PureDisk plug-in that duplicates the backup data. The NetBackup client software creates the image of backed up files as for a normal backup. Next, the PureDisk plug-in breaks the backup image into segments and compares them to all of the segments that are stored in that deduplication node. The plug-in then sends only the unique segments to the NetBackup Deduplication Engine on the storage server. The engine writes the data to a media server deduplication pool.

Client deduplication does the following:

■Reduces network traffic. The client sends only unique file segments to the storage server. Duplicate data is not sent over the network.

■Distributes some deduplication processing load from the storage server to clients. (NetBackup does not balance load between clients; each client deduplicates its own data.)

Figure 2-2shows client deduplication. The deduplication storage server is a media server on which the deduplication core components are enabled.