This book deals with the migration from JES3 to JES2. Part One describes this decision. Part Two describes the steps and considerations of this migration.

This IBM® Redbooks® publication provides information to help clients that have JES3 and would like 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.

The book is aimed at operations personnel, system programmers, and application developers.

Part 1. The decision to migrate from JES3 to JES2

Chapter 1. How JES2 works

Chapter 2. Terminology differences

Chapter 3. Differences between JES2 and JES3 are becoming smaller

Chapter 4. JECL and JCL differences

Chapter 5. Migration considerations

Part 2. Details of the migration

Chapter 6. Planning for a JES3 to JES2 migration

Chapter 7. JES procs and initialization decks

Chapter 8. User exits

Chapter 9. Operational considerations

Chapter 10. Related products

Chapter 11. Security considerations

Chapter 12. Workload Manager considerations

Chapter 13. Performance and throughput considerations

Chapter 14. Output processing

Chapter 15. NJE considerations

Chapter 16. Accounting and chargeback considerations

Chapter 17. Availability considerations

Appendix A. Sample JES3 exit to analyze JECL usage

Appendix B. Comparison of JES3 and JES2 commands