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Contents
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Tables
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix
Preface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi
The Team That Wrote This Redbook
........................ xxi
Redbook Builders and Key Contributors
.................... xxi
Authors and Significant Contributors
...................... xxii
Comments Welcome
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii
Part 1. Planning the Migration - An Introduction ......................... 1
Chapter 1. Why Customers Migrate
......................... 3
1.1 A Synopsis of This Book
............................. 3
1.2 Traditional Reasons for Migrating
........................ 4
1.2.1 Business Consolidation
. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.2 Mergers/Acquisitions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.3 Capacity Constraints
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.4 Image
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3 Functional Reasons for Migrating to OS/390
.................. 10
1.3.1 Applications Availability
. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.2 Systems Management
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.3 Connectivity
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.3.4 Systems Availability
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.3.5 Staff Availability
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 2. Sizing the Effort
.............................. 13
2.1 Introduction to Sizing
............................... 13
2.1.1 Defining the Migration Project Objectives
................. 13
2.1.2 Areas of VSE and OS/390 Differences
................... 14
2.1.3 Comparison of Basic VSE Functions & Components to OS/390
.... 16
2.2 OS/390 Components/Products/Subsystems
. . . . . . . . . . . . . . . . . . 18
2.2.1 The OS/390 Operating Environment
.................... 19
2.2.2 Subsystem Level Comparison/Affinity
................... 24
2.3 What Changes Between VSE and OS/390?
................... 24
2.3.1 Philosophical Changes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.4 Who is Affected by This Migration?
....................... 26
2.4.1 Job Roles and Normal Activities
...................... 26
2.5 Approaches to Migration
............................. 27
2.5.1 Disclaimer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.5.2 OS/390 Conversion and Production Implementation Strategies
.... 27
2.5.3 VM/ESA Guest Support in Your VSE to OS/390 Migration
....... 29
2.5.4 Staffing Strategies
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5.5 Conversion Tools
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6 Educational Requirements
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.6.1 Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.7 Scope of Work and Challenges
.......................... 32
2.7.1 Application Inventory
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.7.2 Program Conversion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.7.3 JCL Conversion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.7.4 File Migration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Copyright IBM Corp. 1998 iii