>>-+------------+----------------------------------------------><
   +-COMPRESS---+   
   '-HWCOMPRESS-'   

HWCOMPRESS specifies that DFSMSdss writes the dumped data in compressed form to the output medium. This decreases the space occupied by the dump data. Hardware assisted compression is performed on the dumped data using the System z® CMPSC instruction.

Logical Data Set DUMP: Data sets that are less than five tracks in size (used space or allocated space when ALLDATA is specified) are not compressed.

Physical Full Volume, Tracks, and Data Set DUMP: DFSMSdss rebuilds the compression dictionary after 15 consecutive compressions that do not have a new size of at most 94% the original size. The values 15, and 94% may be tuned with patch bytes as described in the DFSMSdss Storage Administration Guide.

Restriction: The HWCOMPRESS keyword cannot be specified with the COMPRESS keyword.