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Tivoli Storage Manager for Windows Backup-Archive Clients Installation and User's Guide

Compression

The compression option compresses files before you send them to the server. Compressing your files reduces data storage for backup versions and archive copies of your files. It can, however, affect Tivoli Storage Manager throughput. A fast processor on a slow network connection benefits from compression, but a slow processor on a fast network connection does not.

Tivoli Storage Manager backs up a sparse file as a regular file if client compression is off. Set the compression option to yes to enable file compression when backing up sparse files to minimize network transaction time and maximize server storage space.

If you set the compressalways option to yes, compression continues even if the file size increases. To stop compression if the file size grows, and resend the file uncompressed, set the compressalways option to No.

If you set the compression option to yes, you can control compression processing in the following ways:

This option controls compression only if your administrator specifies that your client node can compress files before sending them to the server.

Use the compression option with the archive, incremental, and selective commands.

Note:
The server can also define this option.

Supported Clients

This option is valid for all Windows clients.

Options File

Place this option in the client options file dsm.opt.

Syntax

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

Parameters

No
Files are not compressed before they are sent to the server. This is the default. For options with a No parameter, acceptable alternatives are 0, false, and off.

Yes
Files are compressed before they are sent to the server. For options with a Yes parameter, acceptable alternatives are 1, true, and on.

Examples

Options file:
compression yes

Command line:
-compressi=no


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