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ABCs of z/OS System Programming Volume 13

An IBM Redbooks publication


Published on 27 January 2012, updated 07 February 2012

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ISBN-10: 0738436259
ISBN-13: 9780738436258
IBM Form #: SG24-7717-01

Authors: Paul Rogers and Juha Vainikainen

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    A major goal of operating systems is to process jobs while making the best use of system resources. Thus, one way of viewing operating systems is as resource managers. Before job processing, operating systems reserve input and output resources for jobs. During job processing, operating systems manage resources such as processors and storage. After job processing, operating systems free all resources used by the completed jobs, making the resources available to other jobs. This process is called resource management.

    There is more to the processing of jobs than the managing of resources needed by the jobs. At any instant, a number of jobs can be in various stages of preparation, processing, and post-processing activity. To use resources efficiently, operating systems divide jobs into parts. They distribute the parts of jobs to queues to wait for needed resources. Keeping track of where things are and routing work from queue to queue is called workflow management, and is a major function of any operating system.

    JES3 considers job priorities, device and processor alternatives, and installation-specified preferences in preparing jobs for processing job output. This IBM® Redbooks® publication describes a JES3 environment that includes the following:

    - Single-system image

    - Workload balancing

    - Availability

    - Control flexibility

    - Physical planning flexibility.

    Table of Contents

    Chapter 1. Job entry subsystem (JES3)

    Chapter 2. Spool data sets and checkpoint

    Chapter 3. JES3 job flow and scheduling

    Chapter 4. JES3 spool data management

    Chapter 5. JES3 initialization

    Chapter 6. JES3 input service

    Chapter 7. Converter/interpreter processing

    Chapter 8. Main device scheduling (MDS)

    Chapter 9. JES3 job scheduling - GMS

    Chapter 10. WLM batch initiator management

    Chapter 11. JES3 output processing

    Chapter 12. JES3 and multisystem consoles

    Chapter 13. MVS System Logger/JES3 DLOG

    Chapter 14. RJP and NJE

    Chapter 15. JES3 dynamic support programs

    Chapter 16. Spool partitioning and spool recovery

    Chapter 17. JES3 Monitoring Facility (JMF)

    Chapter 18. System Display and Search Facility (SDSF) in the JES3 environment

    Appendix A. SDSF ISFPARMS default definitions

    Appendix B. SDSF REXX and SDSF in batch examples


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