DFSORT interface changes for z/OS V2R1

New reserved words for symbols

The following are new DFSORT/ICETOOL reserved words which are no longer allowed as symbols: LC, LN, MC, MN, UC and UN.

If you used any of these words as a symbol previously, you must change them. For example, if you used MC, you can change it to mc.

Central storage controls

The IBM-supplied default for the existing EXPOLD installation option has been changed to EXPOLD=50%. If you want DFSORT to use EXPOLD, as in previous releases, you can set EXPOLD=MAX.

The IBM-supplied default for the existing EXPRES installation option has been changed to EXPRES=10%. If you want DFSORT to use EXPRES, as in previous releases, you can set EXPRES=0.

The IBM-supplied default for the new TUNE installation option is TUNE=STOR which specifies allocation of available central storage as needed in increments sized to balance resource usage for concurrent sorts. If you want DFSORT to allocate available central storage using fixed sized increments, as in previous releases, you can set TUNE=OLD.

TUNE installation option

A new TUNE installation default allows you to specify whether DFSORT should allocate storage in increments with additional disk work space to minimize the risk of failure, or to allocate all storage at initialization so disk work space allocation can be reduced.