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.

Tip: This option controls compression only if your administrator specifies that your client node determines the selection. The server also can define this option.

A fast processor on a slow network connection benefits from compression, but a slow processor on a fast network connection does not. Use this option with the backup-archive client option, compressalways.

If you specify compressalways YES, compression continues even if the file size increases. To stop compression if the file size grows, and resend the uncompressed file, specify compressalways NO.

If you specify compression YES, you can control compression processing in the following ways:

  • Use the exclude.compression option in your include-exclude options file to exclude specific files or groups of files from compression processing.
  • Use the include.compression option in your include-exclude options file to include files within a broad group of excluded files for compression processing.

Options File

Place this option in the client system options file dsm.sys within a server stanza.

Syntax

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                .-NO--.   
>>-COMPRESSIon--+-----+----------------------------------------><
                '-YES-'   

Parameters

NO
Files are not compressed before they are sent to the server. This is the default.
YES
Files are compressed before they are sent to the server.