IBM Tivoli Storage Manager, Version 7.1

Deduplication

Use the deduplication option to specify whether to enable redundant client-side data elimination when data is transferred to the Tivoli® Storage Manager server during backup and archive processing.

Data deduplication is disabled if the enablelanfree or subfilebackup options are set. Tivoli Storage Manager client encrypted files are excluded from client-side data deduplication. Files from encrypted file systems are also excluded.

To support client-side data deduplication, the following criteria must be met:

Client-side data deduplication for the node is enabled on the Tivoli Storage Manager server.
The storage pool destination for the data must be a storage pool that is enabled for data deduplication. The storage pool must have a device type of "file".
A file can be excluded from client-side data deduplication processing (by default all files are included).
The server can limit the maximum transaction size for data deduplication by setting the CLIENTDEDUPTXNLIMIT option on the server. Refer to the Administrator's Guide for details.
The file size must be larger than 2 KB.

Supported Clients

This option is valid for all clients. This option is also valid on the Tivoli Storage Manager client API.

Options File

AIX operating systems HP-UX operating systems Linux operating systems Oracle Solaris operating systems Mac OS X operating systems Place this option in the system-options file (dsm.sys) within a server stanza. You can set this option by selecting the Deduplication > Enable Deduplication check box of the Preferences editor. The option can be set in the client option set on the Tivoli Storage Manager server.

Windows operating systems Place this option in the client options file (dsm.opt). You can set this option by selecting the Deduplication > Enable Deduplication check box of the Preferences editor. The option can be set in the client option set on Tivoli Storage Manager server.

Syntax


                  .-No--.   
>>-DEDUPLication--+-----+--------------------------------------><
                  '-Yes-'

Parameters

No: Specifies that you do not want to enable client-side data deduplication for backup and archive processing. No is the default.
Yes: Specifies that you want to enable client-side data deduplication for backup and archive processing.

Examples

Options file:: deduplication yes
Command line:: -deduplication=yes

This option is valid only on the initial command line. It is not valid in interactive mode.

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