A Guide to JES3 to JES2 Migration

An IBM Redbooks publication

Published 15 August 2018

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ISBN-10: 0738457078
ISBN-13: 9780738457079
IBM Form #: SG24-8427-00
(230 pages)

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Authors: Lydia Parziale, Luiz Fadel, Nobuhiko Furuya, Lutz Kuehner, Ricardo Paranhos


This IBM® Redbooks® publication provides information to help clients that have JES3 and want to migrate to JES2. It provides a comprehensive list of the differences between the two job entry subsystems and provides information to help you determine the migration effort and actions.
This book considers the features of JES2 as available on releases of IBM z/OS® V2R2 and V2R3. It should be used with JES3 to JES2 Migration Considerations, SG24-8083.
This publication is divided into three parts:

  • Part 1, “Planning to migrate from JES3 to JES2” on page 1, gives you information to make the decision and plan your migration.
  • Part 2, “Use Case Study” on page 85, provides a Use Case Study based on an actual customer experience in a successful migration.
  • Part 3, “Appendixes” on page 153, provides an appendix with sample tools that can help the migration process and exploitation of some of the new JES2 functions.
    This book is aimed at operations personnel, system programmers, and application developers.

Table of contents

Part 1. Planning to migrate from JES3 to JES2
Chapter 1. Why JES?
Chapter 2. Terminology differences
Chapter 3. Convergence of JES2 and JES3
Chapter 4. New JES2 functions to help migration
Chapter 5. JES procs and initialization decks
Part 2. Use Case Study
Chapter 6. Customer experience case study
Appendix A. Sample JES3 exit to analyze JECL usage
Appendix B. Comparison of JES3 and JES2 commands
Appendix C. Sample SMF84 Report program
Appendix D. DJC conversion and JEC examples
Appendix E. SPOOL partitioning exits sample code
Appendix F. Alternative conversion programs
Appendix G. Additional material

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