COMPRESS

Important

(BMC.DB2.SPE2410) As of SPE2410, the COMPRESS YES option will be ignored.  

The COMPRESS option allows you to override the COMPRESS installation option that tells BMC AMI Copy if compression of disk image copies is enabled. This option provides synergy with the BMC PACLOG utility, which uses the BMC Extended Compression Architecture (XCA) technology. The compressed disk image copies can be used by the IBM Db2 RECOVER and DSN1COPY utilities and the BMC AMI Recover and UNLOAD PLUS utilities.

This option can also be set with the OPTIONS command (see COMPRESS).

Related topics

Global-COPY-options

Compression-enablement-for-disk-image-copies-COMPRESS


Warning

Always use COMPRESS NO when you have DASD hardware compression enabled.

To enable compression, the PACLOG load library must be in the BMC AMI Copy STEPLIB or JOBLIB. For more details, see the PACLOG for DB2 documentation.

If you do not specify COMPRESS in the COPY command, BMC AMI Copy uses the value of the COMPRESS installation option as the default.

Important

COMPRESS is ignored for Instant Snapshots.

Values of COMPRESS

Value

Description

COMPRESS YES

Specifying COMPRESS YES tells BMC AMI Copy to compress disk image copies. COMPRESS YES can be used in conjunction with the SQUEEZE YES of the COPY and COPY IMAGECOPY commands for additional savings.

If COMPRESS YES is specified but the compression libraries are not available or there is an issue registering the data set to XCA, a warning is issued and the copy continues without compression.

If COMPRESS YES is specified and the data set being copied is on tape, an informational message is issued to indicate that compression will not be invoked.

COMPRESS NO

Specifying COMPRESS NO tells BMC AMI Copy not to use compression for the disk image copies.

For further compression information, see SQUEEZE.

 

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