z/OS MVS JCL Reference
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Parameters on SYSCKEOV DD statements

z/OS MVS JCL Reference

When creating a checkpoint data set:
  • Code a SPACE parameter, but do not request secondary space. The primary space request must be large enough to hold all checkpoints; if not, the job abnormally terminates.
  • Do not code the RLSE subparameter of the SPACE parameter.
  • Code the CONTIG subparameter of the SPACE parameter to request contiguous space. The system otherwise provides additional primary space using extents.
  • The SYSCKEOV DD statement must define a BSAM data set, but cannot define a partitioned data set extended (PDSE).
  • Code DISP=MOD to reduce loss of checkpoint data in case of a system failure during checkpointing.
Other parameters:
  • Do not code on the SYSCKEOV DD statement the following:
    • CHKPT=EOV parameter.
    • DCB parameter. All DCB information is provided by the checkpoint at EOV facility.
    • DEFER subparameter of the UNIT parameter.
  • If you code the LABEL parameter, you must specify LABEL=(,SL) for IBM® standard labels.
  • If the SYSCKEOV data set resides on a direct access storage device, that device cannot be shared with another processor.

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