Compressing output image copy data sets

The data is automatically expanded to its original form during execution of the BMC Recovery utility, the IMAGE COPY PLUS Database Recovery function, and the Incremental Image Copy function and Copy Image Copy functions of the BMC Image Copy utility.

The Copy Image Copy function can use a compressed image copy without expanding it. For more information, see Using-a-compressed-copy-without-expansion.

The Subsystem Data Set Interface (ICPSSDSI) allows non-BMC products to read a compressed image copy. For more information, see Using-the-Subsystem-Data-Set-Interface-ICPSSDSI.

The following keywords control compression of output image copy data sets:

• FSE
• ICALG
• ICCOMP

Procedure

Perform the following steps to compress output image copy data sets:

1. Specify ICCOMP(Y) on a valid control statement or in an options module to activate the compression option.
2. Specify the ICALG keyword on a valid control statement or in an options module to specify the compression algorithm.
3. If you select ICALG(2) or ICALG(3), specify the FSE keyword on a valid control statement or in an options module to indicate whether you want to clear free space elements (FSEs) to binary zeros.

Example

The following example compresses the PYR1 data set using the full character compression algorithm and clears the free space elements to binary zeros before compression: