Where deduplication should occur

The Deduplication property specifies the deduplication action for clients if you use either the NetBackup Data Protection Optimization Option. Table: Client-side deduplication options describes the client-side deduplication options.

The clients that deduplicate their own data and the master server must use the same name to resolve the storage server. The name must be the host name under which the NetBackup Deduplication Engine credentials were created. If they do not use the same name, backups fail. In some environments, careful configuration may be required to ensure that the client and the master server use the same name for the storage server. Such environments include those that use VLAN tagging and those that use multi-homed hosts.

NetBackup does not support the following for client-side deduplication:

Multiple copies per each job configured in a NetBackup backup policy. For the jobs that specify multiple copies, the backup images are sent to the storage server and may be deduplicated there.
NDMP hosts. The backup jobs fail if you try to use client-side deduplication for NDMP hosts.

Table: Client-side deduplication options

Option	Description
Always use the media server (the default)	Always deduplicates the data on the media server. The default. Jobs fail if one of the following is true: The deduplication services on the storage server are inactive. The deduplication pool is down.
Prefer to use client-side deduplication	Deduplicates the data on the client and then sends it directly to the storage server. NetBackup first determines if the storage server is active. If it is active, the client deduplicates the backup data and sends it to the storage server to be written to disk. If it is not active, the client sends the backup data to a media server, which deduplicates the data.
Always use client-side deduplication	Always deduplicates the backup data on the client and then sends it directly to the storage server. If a job fails, NetBackup does not retry the job.

Option

Description

Always use the media server (the default)

Always deduplicates the data on the media server. The default.

Jobs fail if one of the following is true:

The deduplication services on the storage server are inactive.
The deduplication pool is down.

Prefer to use client-side deduplication

Deduplicates the data on the client and then sends it directly to the storage server.

NetBackup first determines if the storage server is active. If it is active, the client deduplicates the backup data and sends it to the storage server to be written to disk. If it is not active, the client sends the backup data to a media server, which deduplicates the data.

Always use client-side deduplication

Always deduplicates the backup data on the client and then sends it directly to the storage server.

If a job fails, NetBackup does not retry the job.

You can override the Prefer to use client-side deduplication or Always use client-side deduplication host property in the backup policies.

See Disable client-side deduplication (policy attribute).

More information about client deduplication is available in the NetBackup Deduplication Guide.

Where deduplication should occur

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