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

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