Output data set disposition

All QUICKSTART-controlled sequential output files must be available for repositioning at restart, so these files must not be deleted when a job step abends.Output sequential files that use some form of DISP=(NEW,....) must be coded with DISP=(NEW,CATLG,CATLG). At restart time, the JCL statements for these data sets must be changed to DISP=(OLD,CATLG,CATLG).

To avoid having to make any JCL changes before a restart when using the DISP=(NEW,....), you can use one of the following methods:

• Allocate the output files in a previous job step and specify DISP=OLD for the data sets at the step that specifies the target application program.
• Specify DISP=(MOD,CATLG,CATLG) for all output sequential files that QUICKSTART controls. This method requires no JCL changes at restart, but the DISP=MOD parameter does not indicate when data is added to an existing data set. For an initial run, DISP=MOD means “start over,” like DISP=NEW. For a restart run, DISP=MOD means “reposition appropriately.”

For information on using GDG data sets, see Using.