A Guide to JES3 to JES2 Migration

An IBM Redbooks publication

Published 06 November 2019

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ISBN-10: 0738458201
ISBN-13: 9780738458205
IBM Form #: SG24-8427-01
(270 pages)

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Authors: Lydia Parziale, Luiz Fadel, 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® V2R3 and V2R4. 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 111, provides a Use Case Study that is based on an actual customer experience in a successful migration.
  • Part 3, “Appendixes” on page 193, 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 JES2?
Chapter 2. Terminology differences
Chapter 3. Convergence of JES2 and JES3
Chapter 4. JES2 functions to help migration
Chapter 5. JES procedure 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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