Symantec NETBACKUP 7 - Manual (Page 28)

■ For the initial full backups of your clients, use the deduplication storage server.
For subsequent backups, use load balancing servers.
Do not expect the deduplication storage server to be the media server that is
used for restores to that client. If a media server deduplicates a client backup,
your restore settings may require that the media server also be used for restores
to that client.
■ Enable client-side deduplication gradually.
If a client cannot tolerate the deduplication processing workload, be prepared
to move the deduplication processing back to a server.
See “About deduplication performance” on page 32.
About compression and encryption
For compression or encryption, Symantec recommends that you enable them so
they occur during the NetBackup deduplication process. If you compress or encrypt
the data before it is deduplicated, deduplication rates are low.
See “About the deduplication configuration file” on page 60.
See “Editing the deduplication configuration file” on page 60.
See “pd.conf file settings” on page 61.
About optimized duplication of deduplicated data
Optimized duplication of deduplicated data reduces the amount of data that is
transmitted over your network. Therefore, you can use optimized duplication for
off-site storage of data for disaster recovery. It can improve recovery times and
minimize the use of off-site tape storage.
Only the unique data segments are transferred.
See “Configuring optimized deduplication copy” on page 57.
Optimized deduplication copy requirements
Figure 2-3 shows a source deduplication node and a destination deduplication
node for optimized deduplication copy. The requirements description follows the
figure.
Planning your deployment
About compression and encryption 28