Restarting using the QUICKSTART Checkpoint facility

During a restart of an application program which had previously utilized the QUICKSTART Checkpoint Facility, the following JCL changes must be implemented:

• A //SYSCHK DD Statement must be added before the Step which is to be restarted, such that the //SYSCHK DD Statement references the dataset name of the MVS Checkpoint Facility dataset to be used to restart the program. For example:

  //SYSCHK  DD DSN=hlq.CKPTDD0n,
  //        DISP=SHR
  //*
  //APPLPGM EXEC PGM=application-program
  //*

  where “n” is set to either “1” or “2”, to select from either of the two MVS Checkpoint Facility datasets used in the previous execution of the Step. SeeError-messages for application program coding examples.

• The RESTART=stepName sub-parameter of the JOB Statement must be specified to refer to the appropriate job step.
•  Any Generation Data Group (GDG) Generation Levels having positive values must be reduced accordingly. For example, any GDG datasets having (+1) must be altered to (+0) prior to restarting the Step.