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IBML
VSE to OS/390 Migration Workbook
Cliff Bays ** Dave Greenough ** John Hutchinson
Dan Janda ** Kevin Jones ** Gilbert Saint-flour
International Technical Support Organization
http://www.redbooks.ibm.com
This book was printed at 240 dpi (dots per inch). The final production redbook with the RED cover will be printed at 1200 dpi and will provide superior graphics resolution. Please see ªHow to Get ITSO Redbooksº at the back of this book for ordering instructions.
SG24-2043-00
IBML |
International Technical Support Organization |
SG24-2043-00 |
|
VSE to OS/390 Migration Workbook
October 1998
Take Note!
Before using this information and the product it supports, be sure to read the general information in Appendix D, ªSpecial Noticesº on page553.
First Edition (October 1998)
This edition applies to Version 2 Release 3 of IBM Virtual Storage Extended/Enterprise Systems Architecture (VSE/ESA), Program Number 5690-VSE, and to all subsequent releases and modifications until otherwise indicated in new editions. It also applies to Version 2 Release 4 of OS/390 (5647-A01) and to all subsequent releases and modifications until otherwise indicated in new editions.
Comments may be addressed to:
IBM Corporation, International Technical Support Organization Dept. HYJ Mail Station P099
522 South Road
Poughkeepsie, New York 12601-5400
When you send information to IBM, you grant IBM a non-exclusive right to use or distribute the information in any way it believes appropriate without incurring any obligation to you.
© Copyright International Business Machines Corporation 1998. All rights reserved.
Note to U.S. Government Users Ð Documentation related to restricted rights Ð Use, duplication or disclosure is subject to restrictions set forth in GSA ADP Schedule Contract with IBM Corp.
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 |
1.1A Synopsis of This Book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2Traditional Reasons for Migrating . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.1Business Consolidation . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.2Mergers/Acquisitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.3Capacity Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2.4 Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
9 |
1.3 Functional Reasons for Migrating to OS/390 . . . . . . . . . . . . . . . . . . |
10 |
1.3.1Applications Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.2Systems Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.3Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.3.4Systems Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.3.5Staff 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 |
2.3What Changes Between VSE and OS/390? . . . . . . . . . . . . . . . . . . . 24
2.3.1Philosophical Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.4Who is Affected by This Migration? . . . . . . . . . . . . . . . . . . . . . . . 26
2.4.1Job Roles and Normal Activities . . . . . . . . . . . . . . . . . . . . . . 26
2.5Approaches to Migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.5.1Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
2.5.4Staffing Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.5.5Conversion Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6Educational Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.6.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.7Scope of Work and Challenges . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.7.1Application Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.7.2Program Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.7.3JCL Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.7.4File Migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
© Copyright IBM Corp. 1998 |
iii |
2.7.5Project Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.7.6Automated Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.8Cost Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.9OS/390 Documentation Resources . . . . . . . . . . . . . . . . . . . . . . . 39
2.9.1Introduction References . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.9.2 |
Key Documents and Other References . . . . . . . . . . . . . . . . . . |
40 |
2.9.3 |
Web URL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
40 |
Chapter 3. Developing the Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
41 |
|
3.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.1.1References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.1.2Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2Plan Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.1Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.2Team . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.3Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.2.4Milestone Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.2.5Education . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.3 Progressive versus Mass Conversion . . . . . . . . . . . . . . . . . . . . . . 49
3.3.1Approach Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.3.2Historical Perspective . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.3.3 Shared Application Files and Databases . . . . . . . . . . . . . . . . . 50
3.3.4Shared Application Code . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.3.5Operations Support Staffing . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.3.6Automated Operations Tools . . . . . . . . . . . . . . . . . . . . . . . . 50
3.3.7 Standardized Conversion Deliverables and Automation . . . . . . . . 51
3.3.8Risk Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.3.9Complexity of Implementation . . . . . . . . . . . . . . . . . . . . . . . 51
3.4Plan Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.4.1Project Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.4.2Project Plan Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Part 2. Converting the VSE Operating System to the OS/390 Operating System |
. . |
67 |
Chapter 4. Job Control Language (JCL) Differences and Considerations |
. . . |
69 |
4.1 The Philosophy of JCL in System/390 . . . . . . . . . . . . . . . . . . |
. . . . |
69 |
4.1.1 VSE/ESA′s Job Control Language Philosophy . . . . . . . . . . |
. . . . |
70 |
4.1.2OS/390′s Job Control Philosophy . . . . . . . . . . . . . . . . . . . . . . 70
4.2High Level Similarities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.2.1JCL Statement and Job Layout . . . . . . . . . . . . . . . . . . . . . . . 72
4.2.2Spooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.3 JCL Differences Between VSE and MVS . . . . . . . . . . . . . . . . . . . . 73
4.3.1Job Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.3.2JCL Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.3.3 Operator Flexibility and Intervention . . . . . . . . . . . . . . . . . . . . 76
4.3.4Allocation of Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.3.5Hidden JCL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.3.6Device Address Specifications . . . . . . . . . . . . . . . . . . . . . . . 80
4.3.7Catalogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.3.8Partition Dependent Codes in JCL . . . . . . . . . . . . . . . . . . . . . 81
4.3.9 Communication Region - DATE and UPSI . . . . . . . . . . . . . . . . . 81
4.3.10VSE Job Control Statements . . . . . . . . . . . . . . . . . . . . . . . . 82
4.3.11MVS Job Control Statements . . . . . . . . . . . . . . . . . . . . . . . 84
4.3.12 Comparison of VSE and MVS JCL - A Summary . . . . . . . . . . . . 86
iv VSE to OS/390 Migration Workbook
4.3.13 |
Summary of MVS JCL Statements . . . . . . . . . |
. . . . . . . . . . . |
88 |
|
4.4 |
JECL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . |
89 |
|
4.4.2 |
Comparison of POWER and JES2 JECL - A Summary |
. . . . . . . . . |
89 |
|
4.4.3 |
Summary of JES2 JECL - A Table . . . . . . . . . . |
. . . . . . . . . . . |
90 |
|
4.5 |
VSE and MVS JCL Comparison Example . . . . . . . . . |
. . . . . . . . . . . |
91 |
|
4.5.1Sample VSE JCL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
4.5.2Sample MVS JCL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
4.5.3Sample VSE plus Carry-Over . . . . . . . . . . . . . . . . . . . . . . . . 94
Chapter 5. Disk and Tape Storage Considerations |
. . . . . . . . . . . . . . . . |
97 |
|
5.1 Access Method Similarities and Differences |
. . . . . . . . . . . . . . . . . . |
97 |
|
5.1.1 |
Access Methods . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . |
97 |
5.1.2 |
Operating System Implementations . . |
. . . . . . . . . . . . . . . . . . |
98 |
5.1.3Miscellaneous Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
5.2Data Set Naming Considerations . . . . . . . . . . . . . . . . . . . . . . . . 99
5.2.1VSE Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
5.2.2OS/390 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
5.3Storage and Space Management . . . . . . . . . . . . . . . . . . . . . . . 100
5.3.1VSE Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
5.3.2OS/390 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
5.3.3System Managed Storage . . . . . . . . . . . . . . . . . . . . . . . . . 100
5.3.4Implementing DFSMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
5.4Tape Similarities and Differences . . . . . . . . . . . . . . . . . . . . . . . 103
5.4.1Volume Interchangeability . . . . . . . . . . . . . . . . . . . . . . . . . 103
5.4.2Standard Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
5.4.3No Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
5.4.4Nonstandard Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
5.4.5 Bypass Label Processing Facility in OS/390 . . . . . . . . . . . . . . 106
5.5DASD Similarities and Differences . . . . . . . . . . . . . . . . . . . . . . 108
5.5.1Volume Interchangeability . . . . . . . . . . . . . . . . . . . . . . . . . 108
5.5.2DASD (VTOC) Processing . . . . . . . . . . . . . . . . . . . . . . . . . 108
5.5.3 Indexed VTOC Considerations (OS/390) . . . . . . . . . . . . . . . . . 109
5.6VSAM Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
5.6.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
5.6.2OS/390 Catalogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
5.6.3OS/390 Catalog Management . . . . . . . . . . . . . . . . . . . . . . . 114
5.6.4 OS/390 - VSE/VSAM Catalog Compatibility . . . . . . . . . . . . . . . 117
5.6.5VSAM Functional Differences . . . . . . . . . . . . . . . . . . . . . . . 119
5.6.6Data Sharing and Integrity . . . . . . . . . . . . . . . . . . . . . . . . . 125
5.6.7 |
Programming Languages and VSAM Support . . . . . . . . . . . . . |
131 |
5.6.8 |
VSAM Error and Reason Code Compatibility . . . . . . . . . . . . . . |
131 |
5.6.9 |
DFSORT and VSAM Considerations . . . . . . . . . . . . . . . . . . . |
131 |
Chapter 6. CICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
133 |
|
6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
133 |
|
6.1.1 |
Overview CICS Transaction Server . . . . . . . . . . . . . . . . . . . |
133 |
6.1.2 |
Essential Supplemental Reading and Migration Support Material . |
134 |
6.1.3 |
General Compatibility Comments . . . . . . . . . . . . . . . . . . . . |
135 |
6.1.4 |
Virtual Storage Considerations for MVS . . . . . . . . . . . . . . . . . |
135 |
6.1.5 |
CICS General System Considerations . . . . . . . . . . . . . . . . . . |
136 |
6.1.6 |
CICS Macro Resource Definition Table Changes . . . . . . . . . . . |
140 |
6.1.7 |
CSD and RDO Considerations . . . . . . . . . . . . . . . . . . . . . . |
143 |
6.1.8 |
CICS System Data Sets Requirements . . . . . . . . . . . . . . . . . |
145 |
6.1.9 |
CICS System Program Interface and Exits . . . . . . . . . . . . . . . |
147 |
6.1.10 |
CICS Transaction Security . . . . . . . . . . . . . . . . . . . . . . . . |
149 |
Contents v
6.1.11CICS UPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
6.1.12Application Programming . . . . . . . . . . . . . . . . . . . . . . . . 150
6.1.13 CICS/VSE and TS Coexistence Considerations . . . . . . . . . . . . 153
6.1.14Testing and Problem Determination Considerations . . . . . . . . . 153
6.1.15Vendor Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
6.2CICS with DL/I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Chapter 7. ICCF and TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
7.1Preparing to Use the System . . . . . . . . . . . . . . . . . . . . . . . . . . 155
7.1.1User Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
7.1.2LOGON Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
7.1.3Message Facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
7.1.4Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
7.1.5Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
7.2Using the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
7.2.1Accessing the System . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
7.2.2Entering and Manipulating Data . . . . . . . . . . . . . . . . . . . . . 159
7.3Executing Programs at a Terminal . . . . . . . . . . . . . . . . . . . . . . 161
7.4 |
Submitting Jobs for Batch Execution . . . . . . . . . . . . . . . . . . . . . |
162 |
7.4.1 Using Command Procedures . . . . . . . . . . . . . . . . . . . . . . . |
163 |
|
7.5 |
Migrating from VSE/ICCF to MVS and TSO/E . . . . . . . . . . . . . . . . |
163 |
7.5.1Converting ICCF Libraries . . . . . . . . . . . . . . . . . . . . . . . . . 163
7.5.2ICCF Procedures and Macros . . . . . . . . . . . . . . . . . . . . . . . 167
Chapter 8. Databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
8.1DL/I and IMS/VS DB Differences . . . . . . . . . . . . . . . . . . . . . . . . 169
8.1.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
8.1.2MVS System Requirements . . . . . . . . . . . . . . . . . . . . . . . . 170
8.1.3Data Base Descriptor (DBD) . . . . . . . . . . . . . . . . . . . . . . . . 170
8.1.4 Program Specification Block (PSB) |
. . . . . . . . . . . . . . . . . . . 171 |
8.1.5Batch Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
8.1.6Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
8.1.7Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
8.1.8Database Portability . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
8.1.9DL/I Multiple Partition Support . . . . . . . . . . . . . . . . . . . . . . 178
8.1.10Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
8.2 SQL/DS to DB2 for OS/390 Migration Consideration . . . . . . . . . . . . 178
8.2.1Descriptions of Users . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
8.2.2Other Comparison Areas . . . . . . . . . . . . . . . . . . . . . . . . . 181
8.2.3Summary of Migration Task . . . . . . . . . . . . . . . . . . . . . . . . 182
Chapter 9. Telecommunications Subsystems . . . . . . . . . . . . . . . . . . 185
9.1ACF/VTAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
9.1.1Product Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
9.1.2Resource Definition and Operation . . . . . . . . . . . . . . . . . . . . 187
9.1.3Customization and Programming . . . . . . . . . . . . . . . . . . . . . 190
9.1.4Network Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
9.2ACF/NCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
9.2.1Product Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
9.2.2Program Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
9.2.3Backlevel Hardware Support . . . . . . . . . . . . . . . . . . . . . . . 193
9.3BTAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
9.3.1Product Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
9.3.2Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
9.4Migrating TCP/IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
viVSE to OS/390 Migration Workbook
9.4.1Network Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
9.4.2TCP/IP Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
9.4.3TCP/IP Related User Data . . . . . . . . . . . . . . . . . . . . . . . . . 195
9.4.4TCP/IP Batch Jobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
9.4.5User Written TCP/IP Applications . . . . . . . . . . . . . . . . . . . . . 195
9.4.6Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
9.4.7Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
9.5MQSeries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
9.5.1 |
MQSeries in Your Operating System Environment . . . . . . . . . . |
198 |
9.5.2 |
Networking Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . |
203 |
9.5.3 |
Defining MQSeries Object and Operating . . . . . . . . . . . . . . . . |
203 |
9.5.4MQSeries-based Applications . . . . . . . . . . . . . . . . . . . . . . . 205
9.5.5Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Chapter 10. POWER and JES2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
10.1JES2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
10.1.1Major Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
10.2Implementing JES2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
10.2.1 Setting Up the Required Resources |
. . . . . . . . . . . . . . . . . . 209 |
10.2.2Starting JES2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
10.2.3Tailoring JES2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
10.3 JES2-POWER Functional Comparison . . . . . . . . . . . . . . . . . . . . 211
10.3.2Input Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
10.3.3Job Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
10.3.4Output Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
10.3.5 Interactive User Interfaces (ICCF/CMS/TSO) . . . . . . . . . . . . . 218
10.3.6Remote Job Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
10.3.7Network Job Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
10.3.8Application Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
10.3.9Accounting Comparisons . . . . . . . . . . . . . . . . . . . . . . . . . 223
10.3.10RAS Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
10.3.11JES2 Testing Techniques . . . . . . . . . . . . . . . . . . . . . . . . 225
10.4 POWER/JES2 Detailed Comparisons . . . . . . . . . . . . . . . . . . . . . |
225 |
|
10.4.1 |
Mapping POWER Parameters to JES2 Init Parms . . . . . . . . . . |
225 |
10.4.2 |
Exit Comparisons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
230 |
10.4.3 |
POWER-JES2 Command Equivalences . . . . . . . . . . . . . . . . . |
231 |
Chapter 11. Advanced Function Printing and Print Services Facility/MVS . . |
235 |
|
11.1Introducing PSF/MVS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
11.1.1Functional Comparison between PSF/VSE and PSF/MVS . . . . . . 235
11.1.2Migration Effort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
11.2Installing and Configuring PSF/MVS . . . . . . . . . . . . . . . . . . . . . 236
11.2.1 Defining Channel-attached Printers to MVS . . . . . . . . . . . . . . 236
11.2.2Defining Network Printers . . . . . . . . . . . . . . . . . . . . . . . . 236
11.2.3The PSF Startup Procedures . . . . . . . . . . . . . . . . . . . . . . . 237
11.2.4Defining Printers for PSF Printing . . . . . . . . . . . . . . . . . . . . 237
11.2.5 |
FSS Procedure and PRINTDEV Statements |
. . . . . . . . . . . . . . |
238 |
11.3 Setting up AFP Resources . . . . . . . . . . . . |
. . . . . . . . . . . . . . . |
240 |
|
11.3.1 |
Migrating Resources from VSE to OS/390 |
. . . . . . . . . . . . . . . |
240 |
11.3.2Remote-Resident Resources . . . . . . . . . . . . . . . . . . . . . . . 240
11.3.3Transferring Print Streams - VSE and OS/390 Coexistence . . . . . 241
11.3.4Migrating Print Applications . . . . . . . . . . . . . . . . . . . . . . . 241
11.4 Understanding Operational Differences . . . . . . . . . . . . . . . . . . . 242
11.4.1Starting and Stopping PSF . . . . . . . . . . . . . . . . . . . . . . . . 242
11.4.2Command Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Contents vii
11.5Other Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
11.5.1Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
11.5.2Installation Exits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
11.5.3Accounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
11.6References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
11.6.1PSF/VSE Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
11.6.2PSF/MVS Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
11.6.3Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
11.6.4Other Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
11.6.5Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
11.6.6Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Part 3. Converting VSE Languages to OS/390 Languages . . . . . . . . . . . . . . . . . . |
247 |
|
Chapter 12. COBOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
249 |
|
12.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
249 |
|
12.1.1 |
General Comments on COBOL for OS/390 and VM . . . . . . . . . |
249 |
12.1.2 |
Comparison of IBM COBOL Compilers . . . . . . . . . . . . . . . . . |
250 |
12.2 VSE to OS/390 Migration Considerations . . . . . . . . . . . . . . . . . . |
250 |
|
12.2.1Migrating Object Code . . . . . . . . . . . . . . . . . . . . . . . . . . 251
12.2.2Useful Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
12.3Converting from DOS/VS COBOL . . . . . . . . . . . . . . . . . . . . . . 252
12.3.1DOS/VS COBOL CICS Programs . . . . . . . . . . . . . . . . . . . . 252
12.3.2DOS/VS COBOL Programs Containing REPORT WRITER
Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
12.4DOS/VS COBOL and COBOL for OS/390 and VM Language Differences 253
12.4.1Common COBOL Coding Problems . . . . . . . . . . . . . . . . . . . 253
12.4.2ENVIRONMENT DIVISION . . . . . . . . . . . . . . . . . . . . . . . . . 255
12.4.3 |
DATA DIVISION - FILE DESCRIPTION (FD) . . . . . . . . . . . . . . . |
256 |
12.4.4 |
PROCEDURE DIVISION - Input/Output . . . . . . . . . . . . . . . . . |
256 |
12.4.5File Handling Considerations . . . . . . . . . . . . . . . . . . . . . . 257
12.5Converting from VS COBOL II . . . . . . . . . . . . . . . . . . . . . . . . . 258
12.5.1VS COBOL II CICS Programs . . . . . . . . . . . . . . . . . . . . . . 259
12.6 Converting from COBOL for VSE/ESA . . . . . . . . . . . . . . . . . . . . 259
12.7Some Conversion Considerations for all VSE COBOL Compilers . . . . 259
12.7.1VSAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
12.7.2DISPLAY Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
12.8Compiler Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
12.8.1RES/NORES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
12.9Reserved Words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
12.9.1Reserved Word Considerations for DOS/VS COBOL . . . . . . . . . 263
12.9.2Reserved Word Considerations for VS COBOL II and COBOL for
VSE/ESA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . |
265 |
12.10 Compiling and Running Your Converted COBOL Programs |
. . . . . . |
265 |
Chapter 13. Assembler
13.1 Assembler Products
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
267 |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
267 |
. . . . . . . . . . . . . . . . |
267 |
13.2.1System Interface and Macros . . . . . . . . . . . . . . . . . . . . . . 268
13.2.2Multitasking Macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
13.2.3Interrupt Handling Routines . . . . . . . . . . . . . . . . . . . . . . . 287
13.2.4Virtual Storage Macros . . . . . . . . . . . . . . . . . . . . . . . . . . 289
13.2.5VSAM Macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
13.2.6Data Management Macros . . . . . . . . . . . . . . . . . . . . . . . . 292
viiiVSE to OS/390 Migration Workbook
Chapter 14. RPG II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
14.1Migration from VSE to OS/390 . . . . . . . . . . . . . . . . . . . . . . . . 329
14.1.1Device Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
14.1.2Print Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
14.1.3Tape Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
14.1.4Extent Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
14.1.5Processing Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
14.1.6File Access Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
14.1.7Calling COBOL Subprograms . . . . . . . . . . . . . . . . . . . . . . 331
14.1.8Calling PL/I Subprograms . . . . . . . . . . . . . . . . . . . . . . . . 331
Chapter 15. PL/I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
333 |
15.1 Functional Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
333 |
15.1.1 EGCS (VSE) to DBCS (OS Version 2) Comments . . . . . . . . . . . |
333 |
15.1.2Extended Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
15.1.3Multitasking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
15.1.4 |
Dynamic Loading of Dependent Programs |
. . . . . . . . . . . . . . |
334 |
15.1.5 |
File Organization . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . |
334 |
15.1.6 |
Parameters Passed to a Main Program |
. . . . . . . . . . . . . . . . |
335 |
15.1.7%INCLUDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
15.2Compiler Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
15.2.1 |
Options |
Specific to the DOS Compiler |
. . . . . . . . . . . . . . . . . |
335 |
15.2.2 |
Options |
Specific to the MVS Compiler |
. . . . . . . . . . . . . . . . . |
336 |
15.2.3Execution Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
15.2.4The EXEC and PROCESS Cards . . . . . . . . . . . . . . . . . . . . . 338
15.3Linkages Between Languages . . . . . . . . . . . . . . . . . . . . . . . . 338
15.3.1Linkages Supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338
15.3.2Linkages not Supported . . . . . . . . . . . . . . . . . . . . . . . . . . 338
15.4ENVIRONMENT Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . 338
15.4.1Not Supported in MVS . . . . . . . . . . . . . . . . . . . . . . . . . . 339
15.4.2Supported but to be Avoided . . . . . . . . . . . . . . . . . . . . . . 340
15.4.3The ²TOTAL² Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
15.4.4 The SIS Option (Sequential Insert Strategy) . . . . . . . . . . . . . . 340
15.5Calling SORT from PL/I . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
15.5.1Interfaces Offered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
15.5.2Parameters to be Passed . . . . . . . . . . . . . . . . . . . . . . . . . 340
15.6Checkpoint-Restart in PL/I . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
15.6.1PLICKPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
15.6.2PLIREST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
15.6.3PLICANC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
15.7DUMP in PL/I Optimizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
15.7.1Output File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
15.7.2Options Specific to DOS . . . . . . . . . . . . . . . . . . . . . . . . . 343
15.7.3Options Specific to MVS . . . . . . . . . . . . . . . . . . . . . . . . . 344
15.7.4Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
15.8Return Codes in PL/I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
15.8.1Setting Return Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
15.8.2Return Code Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
15.9Forcing an ABEND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
15.9.1Use of DISP in the JCL . . . . . . . . . . . . . . . . . . . . . . . . . . 344
15.9.2Automatic Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
15.10Overlay Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
15.10.1Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
15.10.2Overlay in MVS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
15.11Storage Management in PL/I . . . . . . . . . . . . . . . . . . . . . . . . 345
Contents ix
15.11.1Storage Management in DOS . . . . . . . . . . . . . . . . . . . . . 345
15.11.2Storage Management in MVS . . . . . . . . . . . . . . . . . . . . . 345
15.12PL/I and CICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
15.12.1File Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
15.12.2Statements not Supported . . . . . . . . . . . . . . . . . . . . . . . 346
15.12.3CALLing DUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
15.12.4Execution Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
15.12.5Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
15.12.6PL/I-CICS/VS Transaction ABEND Codes . . . . . . . . . . . . . . . 346
15.12.7 PL/I Return from ON-units and CICS Transaction Backout . . . . |
347 |
|
Chapter 16. FORTRAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
349 |
|
16.1 |
VS FORTRAN in OS/390 . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
349 |
16.2 |
FORTRAN Conversion Considerations . . . . . . . . . . . . . . . . . . . . |
349 |
Chapter 17. Language Environment (LE) . . . . . . . . . . . . . . . . . . . . . |
351 |
|
17.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
17.1.1General Comments on Language Environment . . . . . . . . . . . . 351
17.1.2Conceptual Differences between LE/VSE and OS/390 Language
Environment . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . |
352 |
17.2 VSE to OS/390 Migration Considerations |
. . . . . . . . . . . . . . . . . . |
352 |
17.2.1LE/VSE-conforming Languages . . . . . . . . . . . . . . . . . . . . . 352
17.2.2Useful Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
17.3 Migrating from LE/VSE-Conforming Languages . . . . . . . . . . . . . . 353
17.3.1C for VSE/ESA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
17.3.2COBOL for VSE/ESA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
17.3.3PL/I for VSE/ESA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
17.4 Migrating from Non-LE/VSE Run-time Environments . . . . . . . . . . . 354
17.4.1Options Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
17.4.2C/370 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
17.4.3VS COBOL II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
17.4.4DOS/VS COBOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
17.4.5DOS PL/I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
17.4.6VS FORTRAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
17.4.7 Migrating Interlanguage Communications Applications . . . . . . . 358 17.4.8 Migrating Assembler Applications . . . . . . . . . . . . . . . . . . . 359
17.5Migrating from LE/VSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
17.5.1Run-time Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
17.5.2 |
User Exits and Abnormal Termination Exits . . . . . . . . . . . . . . |
364 |
|
17.5.3 |
Callable Services and Math Services |
. . . . . . . . . . . . . . . . . |
365 |
17.5.4LE/VSE 1.4 Locales . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
17.6CICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
17.6.1COBOL and CICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
17.6.2Run-time Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
17.6.3 User Exits and Abnormal Termination Exits . . . . . . . . . . . . . . |
367 |
Chapter 18. Procedure Language REXX . . . . . . . . . . . . . . . . . . . . . . |
369 |
18.1REXX and VM/ESA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
18.2REXX and VSE/ESA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
18.3REXX and TSO/E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
18.4Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
18.4.1VSE/ESA Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
18.4.2VM/ESA Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
18.4.3TSO/E Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
18.4.4 REXX Exec Sample for the OS/2, TSO and CMS Environments . . 371
x VSE to OS/390 Migration Workbook
18.5Migration Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
18.5.1REXX and SAA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
18.6REXX Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
Part 4. Converting VSE Utilities to OS/390 Utilities . . . . . . . . . . . . . . . . . . . . . . . |
373 |
Chapter 19. SORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
375 |
19.1JCL Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375
19.2Control Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377
19.3 Additional DFSORT/VSE Migration Considerations . . . . . . . . . . . . 379
19.3.1Control Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
19.3.2ICETOOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380
Chapter 20. DITTO . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . |
381 |
|
20.1 |
Compatibility with Previous Releases of DITTO |
. . . . . . . . . . . . . . |
381 |
20.2 |
DITTO Functions that are No Longer Supported |
. . . . . . . . . . . . . . |
382 |
20.3 |
DITTO Functions that are Not Recommended |
. . . . . . . . . . . . . . . |
383 |
20.4 |
DITTO Function Code Synonyms . . . . . . . . |
. . . . . . . . . . . . . . . |
384 |
20.5 |
Batch Keywords that are No Longer Supported |
. . . . . . . . . . . . . . |
384 |
20.6 |
Batch Keywords that are Not Recommended |
. . . . . . . . . . . . . . . |
385 |
20.7 |
DITTO/ESA Security . . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . |
385 |
Chapter 21. VSAM Backup/Restore . . . . . . . . . |
. . . . . . . . . . . . . . . |
387 |
|
21.1VSAM Backup/Restore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
21.1.1OS/390 VSAM Backup/Restore . . . . . . . . . . . . . . . . . . . . . 387
21.1.2VSE/VSAM Backup/Restore . . . . . . . . . . . . . . . . . . . . . . . 387
Chapter 22. Librarian . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389
22.1Overall Library Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389
22.1.1OS/390 ISPF Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 390
22.1.2OS/390 Library Management . . . . . . . . . . . . . . . . . . . . . . . 391
Chapter 23. LISTLOG/PRINTLOG - Printing Log Streams . . . . . . . . . . . 393
23.1VSE PRINTLOG Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393
23.2VSE LISTLOG Utility Program . . . . . . . . . . . . . . . . . . . . . . . . . 393
23.3OS/390 Hardcopy Processing . . . . . . . . . . . . . . . . . . . . . . . . . 393
23.3.1SYSLOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
23.3.2Printing SYSLOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
23.4OPERLOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
23.4.1Printing OPERLOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
23.5 JES2 System Data Sets - Job Log and System Messages . . . . . . . . 395
23.6Systems Management Recording . . . . . . . . . . . . . . . . . . . . . . 395
23.6.1Printing SMF Records . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
Chapter 24. VSE/Fast Copy and OS/390 DFSMSdss . . . . . . . . . . . . . . . |
397 |
|
24.1 |
VSE/Fast Copy (Online and Stand-Alone) . . . . . . . . . . . . . . . . . . |
397 |
24.2 |
DFSMSdss - OS/390 Component . . . . . . . . . . . . . . . . . . . . . . . |
398 |
Part 5. Setting Up the Migration Environment . . . . . . . . . . . . . . . . . . . . . . . . . . |
399 |
|
Chapter 25. Prepare the Migration Environment . . . . . . . . . . . . . . . . . |
401 |
|
25.1 |
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
401 |
25.2 |
Install and Configure Required Hardware . . . . . . . . . . . . . . . . . . |
402 |
Contents xi
25.2.1Processor Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 402
25.2.2Devices Supported by OS/390 . . . . . . . . . . . . . . . . . . . . . . 402
25.2.3DASD Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402
25.2.4Other Hardware Requirements . . . . . . . . . . . . . . . . . . . . . 403
25.2.5Inter-Systems Connectivity . . . . . . . . . . . . . . . . . . . . . . . . 404
25.3 |
Order and Install the OS/390 Software . . . . . . . . . . . . . . . . . . . |
405 |
|
25.3.1 |
Fee-based Methods of Installing OS/390 . . . . . . . . . . . . . . . . |
405 |
|
25.3.2 |
Entitled Methods of Installing OS/390 . . . . . . . . . . . . . . . . . . |
406 |
|
25.4 |
Set Up Standards, Procedures, and Documentation . . . . . . . . . . . |
407 |
|
25.4.1 |
Installation Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . |
407 |
|
25.4.2 |
Systems Management Procedures . . . . . . . . . . . . . . . . . . . |
409 |
|
25.4.3 |
Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
412 |
|
25.5 |
Customize Your New OS/390 System . . . . . . . . . . . . . . . . . . . . |
413 |
|
25.5.2MVS BCP Customization . . . . . . . . . . . . . . . . . . . . . . . . . 415
25.5.3Other OS/390 Elements . . . . . . . . . . . . . . . . . . . . . . . . . . 416
Chapter 26. Test Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . |
419 |
|||
26.1 |
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
419 |
||
26.1.1 |
Differences in Testing ²Philosophy² |
. . . . . . . . . . . . . . . . . . |
419 |
|
26.1.2 |
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
419 |
||
26.2 |
Test Systems in the Life of the Migration . . . . . . . . . . . . . . . . . . |
420 |
||
26.3VM, LPAR, or Standalone Systems . . . . . . . . . . . . . . . . . . . . . 421
26.3.1Logical Partitioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
26.3.2Software Partitioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
26.3.3Our Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
26.3.4Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430
26.4Parallel Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430
26.4.2 |
Synchronizing VSE Applications with OS/390 Versions . . . . . . . |
430 |
26.5 Building the Initial OS/390 Test System . . . . . . . . . . . . . . . . . . . |
430 |
|
26.5.1 |
OS/390 Maintenance Environment . . . . . . . . . . . . . . . . . . . |
431 |
26.5.2 |
OS/390 Test Logical Partition . . . . . . . . . . . . . . . . . . . . . . |
431 |
26.5.3 |
Maintaining Your OS/390 Libraries and SMP/E Zones . . . . . . . |
431 |
26.6 Shared DASD vs. Cloned DASD . . . . . . . . . . . . . . . . . . . . . . . |
432 |
|
26.6.1 |
Shared DASD between OS/390 Test Systems (vs. Cloned DASD) . |
432 |
26.6.2 |
Shared DASD between VSE and OS/390 (vs. Cloned DASD) . . . . |
433 |
|
|
|
Part 6. Running Your OS/390 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
435 |
|
Chapter 27. Orienting ICCF Users to TSO/ISPF . . . . . . . . . . . . . . . . . |
437 |
|
27.1TSO/ISPF and SDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437
27.1.1Editing Data Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438
27.1.2Submitting Jobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439
27.1.3Using ISPF Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439
27.1.4 Creating and Executing ISPF Applications . . . . . . . . . . . . . . . 440
27.1.5Managing Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440
27.1.6Tracking Jobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
27.1.7Retrieving Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
27.1.8Using SDSF for Operators . . . . . . . . . . . . . . . . . . . . . . . . 441
Chapter 28. Orientation to OS/390 Console Operation . . . . . . . . . . . . . 443
28.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
28.1.1Operating Hardware Consoles . . . . . . . . . . . . . . . . . . . . . . 443
28.2 Understanding the Operator Interfaces . . . . . . . . . . . . . . . . . . . 443
28.2.1Controlling Consoles . . . . . . . . . . . . . . . . . . . . . . . . . . . 444
xiiVSE to OS/390 Migration Workbook
28.2.2Managing Display Consoles . . . . . . . . . . . . . . . . . . . . . . . 444
28.2.3Extended MCS Consoles . . . . . . . . . . . . . . . . . . . . . . . . . 445
28.2.4 Understanding Message Formats and Replies . . . . . . . . . . . . 446
28.3Controlling the OS/390 System . . . . . . . . . . . . . . . . . . . . . . . . 447
28.3.1Starting the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 447
28.3.2Displaying System Status . . . . . . . . . . . . . . . . . . . . . . . . . 447
28.3.3Stopping the System . . . . . . . . . . . . . . . . . . . . . . . . . . . 448
28.4Controlling Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448
28.4.1Displaying the Status of Devices . . . . . . . . . . . . . . . . . . . . 448
28.4.2Understanding Device Allocation . . . . . . . . . . . . . . . . . . . . 448
28.4.3JES2 Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
28.4.4SDSF Device Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
28.5 Controlling TSO Users, Jobs and Started Tasks . . . . . . . . . . . . . . 449
28.5.1Displaying Work on Your System . . . . . . . . . . . . . . . . . . . . 449
28.5.2Controlling Time Sharing Users . . . . . . . . . . . . . . . . . . . . . 451
28.5.3Controlling Batch Jobs . . . . . . . . . . . . . . . . . . . . . . . . . . 451
28.5.4Controlling Started Tasks . . . . . . . . . . . . . . . . . . . . . . . . . 451
28.6Managing Remote Operations . . . . . . . . . . . . . . . . . . . . . . . . 452
28.6.1JES2 RJE Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . 452
28.6.2NJE Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453
Chapter 29. Orientation for Utilities . . . . . . . . . . . . . . . . . . . . . . . . 455
29.1IEBxxx or IEHxxx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
29.2IEBCOPY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
29.3IDCAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
29.4IEBGENER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
29.5DFSMSdss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 456
Chapter 30. Systems Management Philosophy and Methodology . . . . . . . |
457 |
30.1 The Philosophy of Systems Management . . . . . . . . . . . . . . . . . . |
457 |
30.1.1Systems Management Overview . . . . . . . . . . . . . . . . . . . . 457
30.1.2Systems Management Scope - What Needs to be Managed? . . . 459
30.1.3The Role of Automation . . . . . . . . . . . . . . . . . . . . . . . . . . 460
30.2Change Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460
30.2.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460
30.2.2Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460
30.2.3Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
30.3Problem Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
30.3.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461
30.3.2Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462
30.3.3Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462
30.4Performance Management . . . . . . . . . . . . . . . . . . . . . . . . . . 463
30.4.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463
30.4.2Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463
30.4.3Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 464
30.5Operations Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465
30.5.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465
30.5.2Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465
30.5.3Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 466
30.6Security Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468
30.6.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468
30.6.2Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468
30.6.3Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469
30.7Configuration Management . . . . . . . . . . . . . . . . . . . . . . . . . . 469
30.7.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469
Contents xiii
30.7.2Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469
30.7.3Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470
30.8Asset Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471
30.8.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471
30.8.2Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471
30.8.3Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471
30.9Accounting Management . . . . . . . . . . . . . . . . . . . . . . . . . . . 471
30.9.1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471
30.9.2Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 472
30.9.3Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 472
30.10 Summary . . . . . . . . . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . |
472 |
Chapter 31. Diagnosing System Problems |
. . . . . . . . . . . . . . . . . . . . |
473 |
31.1Problem Determination Tools . . . . . . . . . . . . . . . . . . . . . . . . . 473
31.2Dumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
31.3IPCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
31.3.1Analyzing Dumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473
31.3.2Traces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474
31.3.3Analyzing Traces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474
31.3.4Using IPCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474
31.4JES2 Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475
31.5SLIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475
31.6Performance Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475
31.7LOGREC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475
31.8SYSLOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476
31.9DFSMS/MVS Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476
31.9.1DFSMSdfp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476
31.9.2DFSMShsm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477
31.9.3DFSMSrmm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478
31.9.4DFSMSdss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478
31.10Diagnostic Reference Publications . . . . . . . . . . . . . . . . . . . . . 478
Part 7. Converting your Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479
Chapter 32. Conversion Process . . . . . . . . . . . . . . . . . . . . . . . . . . 481
32.1Conversion Process Introduction . . . . . . . . . . . . . . . . . . . . . . . 482
32.1.1References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 483
32.1.2Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484
32.1.3Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484
32.1.4Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486
32.2 Mass Conversion - Background, Benefits and Method . . . . . . . . . . |
486 |
|
32.2.1 |
IBM MVS Migration System - Background . . . . . . . . . . . . . . . |
486 |
32.2.2 |
Mass Conversion Overview / Benefits . . . . . . . . . . . . . . . . . |
487 |
32.2.3Mass Conversion Tools . . . . . . . . . . . . . . . . . . . . . . . . . . 489
32.2.4Automated Conversion Process . . . . . . . . . . . . . . . . . . . . . 490
32.2.5CORTEX MS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 490
32.3Mass Conversion Phase Overview . . . . . . . . . . . . . . . . . . . . . . 493
32.4Preparation Phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493
32.4.1 |
Phase 0: Project Management and Technical Leadership . . . . . |
494 |
32.4.2 |
Phase 1: Application Inventory . . . . . . . . . . . . . . . . . . . . . |
495 |
32.4.3 |
OS/390 Standards and Naming Conventions . . . . . . . . . . . . . |
497 |
32.4.4 |
Phase 2: Conversion Specifications . . . . . . . . . . . . . . . . . . . |
499 |
32.4.5 |
Phase 3: Customization or Development of Conversion Tools . . . |
501 |
32.5Conversion Phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503
xivVSE to OS/390 Migration Workbook
32.5.1Program Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . 503
32.5.2JCL Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504
32.5.3Phase 4: Initial Trial Conversion . . . . . . . . . . . . . . . . . . . . 505
32.5.4Phase 5: OS/390 Regression Tests and Repeated Trial
Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506
32.5.5Initialization Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511
32.5.6Unit Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511
32.5.7System Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513
32.5.8 |
Parallel/Production Simulation Testing |
. . . . . . . . . . . . . . . . |
514 |
||
32.6 Implementation Phases |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . |
515 |
|||
32.6.2 |
Phase 6: Actual Conversion and Switchover . . . . . . . . . . . . . |
516 |
|||
32.6.3 |
Switchover |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
517 |
||
32.6.4 |
Phase 7: Initial OS/390 Operations . . . . . . . . . . . . . . . . . . . |
518 |
|||
Chapter 33. Conversion Services and Tools . . . . . . . . . . . . . . . . . . . |
519 |
||||
33.1Conversion Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519
33.1.1IBM Global Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519
33.1.2 Automated Migration Services (AMS) . . . . . . . . . . . . . . . . . 519
33.2Conversion Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520
33.2.1VSE/ESA Facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520
33.2.2IBM OPTI-AUDIT for VSE . . . . . . . . . . . . . . . . . . . . . . . . . 520
33.2.3 |
IBM COBOL and CICS Command Level Conversion Aid (CCCA) . |
522 |
33.2.4 |
SISRO - CORTEX-Migration System (CORTEX-MS) . . . . . . . . . |
524 |
33.2.5Computer Associates . . . . . . . . . . . . . . . . . . . . . . . . . . . 525
33.2.6The Source Recovery Company . . . . . . . . . . . . . . . . . . . . . 525
Part 8. Migration Experience |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
527 |
Chapter 34. |
Customer Migration Example . . . . . . . . . . . . . . . . . . . . . |
529 |
34.1Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529
34.2Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529
34.3Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530
34.4Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530
34.5Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 531
34.6Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 531
34.7Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 532
Part 9. Appendixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
533 |
||
Appendix A. Education Information . . . . . . . . . . . . . . . . . . . . . . . . |
535 |
||
A.1 |
What Training is Needed and What Training Courses are Available . . |
535 |
|
A.1.1 |
OS/390 Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
535 |
|
A.1.2 |
Custom Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
536 |
|
A.1.3 |
OEM Product Education . . . . . . . . . . . . . . . . . . . . . . . . . . |
536 |
|
A.2 |
When are Courses Scheduled and When are they Needed? . . . . . . . |
536 |
|
A.3 |
Who will Provide the Training? . . . . . . . . . . . . . . . . . . . . . . . . |
537 |
|
A.4 |
Where will the Training Take Place? . . . . . . . . . . . . . . . . . . . . . |
537 |
|
Appendix B. Mapping ISV Products and Functions . . . . . . . . . . . . . . . |
539 |
||
B.1 |
The IBM Software Migration Project Office (SMPO) . . . . . . . . . . . . |
539 |
|
B.2 |
VSE ISV System Management Products and OS/390 Compared . . . . . |
539 |
|
Appendix C. DFSMS Naming Conventions . . . . . . . . . . . . . . . . . . . . |
543 |
||
Contents xv
C.1 |
Data Set Naming Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . |
543 |
||
C.2 |
Components of a Data Set Name . . . . . . . . . . . . . . . . . . . . . . . |
544 |
||
C.2.1 |
High-Level Qualifier (HLQ) . . . . . . . . . . . . . . . . . . . . . . . . |
544 |
||
C.2.2 |
Relative Importance . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
546 |
||
C.2.3 |
File Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
546 |
||
C.2.4 |
User Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
547 |
||
C.2.5 |
Data Set Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
547 |
||
C.3 |
Things Not to Include in the Data Set Name |
. . . . . . . . . . . . . . . . |
547 |
|
C.3.1 |
Department Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
547 |
||
C.3.2 |
Application Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
548 |
||
C.3.3 |
Management Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
548 |
||
C.3.4 |
Output Device Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
548 |
||
C.3.5 |
Expiration Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
548 |
||
C.3.6 |
Access Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
549 |
||
C.3.7 |
Job Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
549 |
||
C.4 |
Common Applications - Naming Conventions . . . . . . . . . . . . . . . . |
549 |
||
C.4.1 |
TSO Naming Conventions . . . . . . . . . . . . . . . . . . . . . . . . . |
549 |
||
C.4.2 |
VSAM Data Set Naming Conventions . . . . . . . . . . . . . . . . . . |
550 |
||
C.4.3 |
DB2 Naming Conventions . . . . . . . . . . . . . . . . . . . . . . . . . |
550 |
||
C.4.4 |
Generation Data Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . |
551 |
||
Appendix D. Special Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
553 |
|||
Appendix E. Related Publications . . . . . . . . . . . . . . . .
E.1 |
International Technical Support Organization Publications |
||
E.1.1 |
OS/390 and MVS Redbooks . . . . . . . . . . . . . . . |
||
E.1.2 |
Other Redbooks . . . . . . . . . . . . . . . . . . . . . . |
||
E.2 |
OS/390 Product Publications . . . . . . . . . . . . . . . . . |
||
E.2.1 |
Planning Books . . . . . . . . . . . . . . . . . . . . . . |
||
E.2.2 |
OS/390 Online Product Library . . . . . . . . . . . . . |
||
E.3 |
Other Publications . . . . . . . . . . . . . . . . . . . . . . . |
||
E.4 |
Other Sources . . . . . . . . . . . . . . . . . . . . . . . . . . |
||
E.4.1 |
Books on the Internet |
. . . . . . . . . . . . . . . . . . |
|
E.5 |
Redbooks on CD-ROMs . . . . . . . . . . . . . . . . . . . . |
||
How to Get ITSO Redbooks . . . . . . . . . . . . . . . . . . . .
How IBM Employees Can Get ITSO Redbooks . . . . . . . . .
How Customers Can Get ITSO Redbooks . . . . . . . . . . . .
IBM Redbook Order Form . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . |
557 |
. . . . . . . . |
557 |
. . . . . . . . . |
557 |
. . . . . . . . . |
557 |
. . . . . . . . . |
557 |
. . . . . . . . . |
558 |
. . . . . . . . . |
558 |
. . . . . . . . . |
559 |
. . . . . . . . . |
559 |
. . . . . . . . . |
559 |
. . . . . . . . . |
559 |
. . . . . . . . . |
561 |
. . . . . . . . . |
561 |
. . . . . . . . . |
562 |
. . . . . . . . . |
563 |
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
565 |
|
List of Abbreviations |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
583 |
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
591 |
|
ITSO Redbook Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
593 |
|
xvi VSE to OS/390 Migration Workbook
Figures
1.VAE with Three Address Spaces . . . . . . . . . . . . . . . . . . . . . . . . 6
2. VAE with Four Address Spaces . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.VSE/ESA Storage Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.OS/390 Storage Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.Migration Team . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6. |
Progressive versus Mass Conversion |
. . . . . . . . . . . . . . . . . . . . . |
49 |
7. |
Nonstandard Labels Supported by VSE |
. . . . . . . . . . . . . . . . . . . |
107 |
8.Extract from WSC Flash 9741 . . . . . . . . . . . . . . . . . . . . . . . . . 113
9. OS/390 Master and User Catalog Structure . . . . . . . . . . . . . . . . 116
10.OS/390 VSAM Integrity Provided by Cross-Region Shareoptions . . . . 126
11.Example of an MVS CICS/OS System using MRO . . . . . . . . . . . . . 136
12.CICS Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
13. Log Stream Choices Resulting from Hardware and Software Used . . 146
14.MVS Data Sets used by CICS . . . . . . . . . . . . . . . . . . . . . . . . . 146
15. |
DL/I Functions Requiring Attention when Migrating to IMS/VS . . . . . |
169 |
16. |
Steps in Migrating DL/I Databases to IMS/ESA . . . . . . . . . . . . . . |
177 |
17.VTAM Start Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
18.Comparison of IBM COBOLs . . . . . . . . . . . . . . . . . . . . . . . . . 250
19.Compiler Options Comparison DOS/VS COBOL and COBOL for OS/390
and VM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
20.Recommended COBOL for OS/390 and VM Compiler Options for
Converted VS COBOL II Programs . . . . . . . . . . . . . . . . . . . . . . 262
21.Compiler Options Comparison VS COBOL II and COBOL for OS/390
and VM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
22.Reserved Words in COBOL for OS/390 and VM and not in DOS/VS
COBOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
23.Reserved Words in COBOL for OS/390 and VM for Unsupported
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . |
264 |
24. Compiler Directing Words in COBOL for OS/390 and VM |
. . . . . . . . |
264 |
25.Reserved Words in COBOL for OS/390 and VM and not in VS COBOL II 265
26.Reserved Words in COBOL for OS/390 and VM for Object-Oriented
COBOL Extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
27.VSE Subroutine Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
28.MVS Subroutine Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
29. |
Sample Initiation Termination Coding . . . |
. . . . . . . . . . . . . . . . . |
274 |
30. |
VSE and MVS Time Degrees of Precision |
. . . . . . . . . . . . . . . . . |
279 |
31. |
Comparison of the DTFCD and DCB Macros |
. . . . . . . . . . . . . . . . |
295 |
32.Card File Macros in VSE and MVS . . . . . . . . . . . . . . . . . . . . . . 295
33. |
Card File Programs in VSE and MVS . . . . . . . . . . . . . . . . . . . . |
296 |
34. |
Comparison of the DTFPR and DCB Macros . . . . . . . . . . . . . . . . |
297 |
35. |
Comparison of the DTFMT and DCB Macros . . . . . . . . . . . . . . . . |
302 |
36. |
Tape File Programs in VSE and MVS . . . . . . . . . . . . . . . . . . . . |
303 |
37. |
Comparison of DTFDI and DCB macros . . . . . . . . . . . . . . . . . . . |
304 |
38. |
Comparison of the DTFSD and DCB Macros . . . . . . . . . . . . . . . . |
310 |
39. |
Sequential DASD FILE Program in VSE and MVS . . . . . . . . . . . . . |
311 |
40. |
Comparison of DTFDA and DCB Macros . . . . . . . . . . . . . . . . . . |
312 |
41. |
VSE Error Bytes and MVS Exception Code Bits . . . . . . . . . . . . . . |
313 |
42. |
Record Reference by ID in VSE and MVS . . . . . . . . . . . . . . . . . . |
317 |
43. |
Record Reference by KEY in VSE and MVS . . . . . . . . . . . . . . . . |
318 |
44.Updating a DAM File under MVS . . . . . . . . . . . . . . . . . . . . . . . 318
45.Adding to a DAM File under MVS . . . . . . . . . . . . . . . . . . . . . . 319
© Copyright IBM Corp. 1998 |
xvii |
46. |
Loading a Sequential DAM File under VSE . . . . . . . . . . . . . . . . . |
319 |
47. |
Loading a Sequential DAM File under MVS . . . . . . . . . . . . . . . . |
320 |
48. |
Loading a Random DAM File under MVS . . . . . . . . . . . . . . . . . . |
320 |
49. |
Loading a DAM File of U. or V. Length Records under MVS . . . . . . |
321 |
50.Processing a DAM file under VSE . . . . . . . . . . . . . . . . . . . . . . 324
51. Loading a Random (Preformatted) DAM File under VSE . . . . . . . . . 325
52.MVS Feedback Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
53.Relationship between CCB operands and MVS Equivalents . . . . . . . 327
54. |
Relationship between DTFPH Macro and MVS equivalents . . . . . . . |
328 |
55. |
Comparison VSE and MVS Major Elements . . . . . . . . . . . . . . . . |
328 |
56.Callable Services in LE/VSE 1.4 with Differing Names in OS/390
Language Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
57.Automated Conversion Process . . . . . . . . . . . . . . . . . . . . . . . 491
58.Project Phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493
xviii VSE to OS/390 Migration Workbook
Tables
1. |
Comparison of VSE Functions & Components to OS/390 Replacements |
16 |
2. |
Who′ s Normal Activities are Affected? . . . . . . . . . . . . . . . . . . . . |
26 |
3.Nine Month Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.CNV Responsibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
5.ABC Responsibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.SER Responsibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7. VSE Job Control Statements Summary . . . . . . . . . . . . . . . . . . . . 86
8.MVS Job Control Statements . . . . . . . . . . . . . . . . . . . . . . . . . . 88
9. Overview of POWER JECL Statements . . . . . . . . . . . . . . . . . . . . 89
10.JES2 Control Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
11.JES2 Input Sources (compared to POWER)
12.POWER/JES2 Job Scheduling Comparison
13.POWER/JES2 Output Service Comparison
. . . . . . . . . . . . . . . . . |
212 |
. . . . . . . . . . . . . . . . . |
213 |
. . . . . . . . . . . . . . . . . |
215 |
14.FCB Name Prefixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
15. |
POWER/ICCF, VM/CMS, and JES2/TSO Functional Comparison . . . . |
219 |
16. |
Accounting Records for NJE Activities . . . . . . . . . . . . . . . . . . . |
224 |
17. |
POWER Macro to JES2 Parameter Mapping . . . . . . . . . . . . . . . . |
226 |
18. |
PLINE MACRO to JES2 Parameter Mapping . . . . . . . . . . . . . . . . |
228 |
19. |
PRMT MACRO to JES2 Parameter Mapping . . . . . . . . . . . . . . . . |
228 |
20. |
PRMT MACRO to JES2 Parameter Mapping . . . . . . . . . . . . . . . . |
229 |
21. |
PNODE MACRO to JES2 Parameter Mapping . . . . . . . . . . . . . . . |
230 |
22. |
PCPTAB MACRO to JES2 Parameter Mapping . . . . . . . . . . . . . . |
230 |
23.POWER Exit to JES2 Exits . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
24.Queue Management Commands . . . . . . . . . . . . . . . . . . . . . . . 232
25.Task Management Commands . . . . . . . . . . . . . . . . . . . . . . . . 232
26.Control Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
27.Network Management Commands . . . . . . . . . . . . . . . . . . . . . . 233
28.File Control Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
29.Sending Commands and Messages . . . . . . . . . . . . . . . . . . . . . 234
30.PRINTDEV Parameter Comparison . . . . . . . . . . . . . . . . . . . . . . 239
31. VSE - OS/390 Command Comparison . . . . . . . . . . . . . . . . . . . . 242
32.Useful COBOL Publications . . . . . . . . . . . . . . . . . . . . . . . . . . 252
33. Action of COBOL Program Termination Statements . . . . . . . . . . . 257
34.COBOL and PL/I: What Runs Where? . . . . . . . . . . . . . . . . . . . . 351
35.Useful Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
36. REPORT and ISASIZE Options, C/370 and DOS PL/I . . . . . . . . . . . 355
37.C/370 Migration Considerations . . . . . . . . . . . . . . . . . . . . . . . 355
38. |
VS COBOL II Migration Considerations . . . . . . . . . . . . . . . . . . . |
356 |
39. |
DOS/VS COBOL Migration Considerations . . . . . . . . . . . . . . . . . |
356 |
40.DOS PL/I Migration Considerations . . . . . . . . . . . . . . . . . . . . . 357
41.ILC Migration Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 358
42.Option Recommendations Differing between LE/VSE 1.1 and OS/390 Language Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
43.Option Recommendations Differing between LE/VSE 1.4 and OS/390 Language Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
44.Option Recommendations for CICS Differing between LE/VSE and
OS/390 Language Environment . . . . . . . . . . . . . . . . . . . . . . . . 367
45.OS/390 DASD Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403
46.S/390 Software Product Mapping . . . . . . . . . . . . . . . . . . . . . . . 539
© Copyright IBM Corp. 1998 |
xix |
xx VSE to OS/390 Migration Workbook
Preface
The purpose of this document is to provide information and guidance to personnel involved in a VSE to OS/390 operating system change; that is, a VSE to OS/390 migration.
The primary focus is on VSE program and file conversions, and on operational differences between the two systems. Chapters on each of the source languages are included. DB/DC conversions, and operational differences between POWER and JES2 are also addressed.
Within each chapter, not only are the differences pointed out, but OS/390 implementation and suggested use recommendations are made wherever possible. These recommendations can help the migrating customer ²better² design their use of OS/390.
Throughout this document, the term MIGRATION refers to the entire process of transition from a VSE environment to an OS/390 environment. The term CONVERSION describes the process of translating and updating VSE applications and data to meet the requirements of OS/390.
The Team That Wrote This Redbook
This redbook was produced by a team of specialists from around the world working with the International Technical Support Organization Poughkeepsie Center.
Our thanks to Judith Jay for bringing a renewed focus to the issues, concerns and effort required to migrate from VSE to OS/390.
Redbook Builders and Key Contributors
Cliff Bays IBM, Endicott
Bimshire Davis IBM, Chicago
Don Durand IBM, Poughkeepsie
Dan Ebaugh IBM, Gaithersburg
Patrick Fournier Managing Partner, Automated Migration Services, Walnut
Creek, CA
Dave Greenough IBM, Vermont
John Hutchinson IBM, Gaithersburg
Dan Janda IBM, Endicott
Judith Jay IBM, White Plains
Kevin Jones IBM, Endicott
Herbert Kratzer IBM, Germany
Tom Plunkett Senior Director of Systems Engineering, Automatic Data
Processing, Inc., Roseland, NJ
Gilbert Saint-flour Technical Manager, Automated Migration Services,
Livingston, NJ
John Sutera IBM, Endicott
Guenter Weigelt IBM, Germany
© Copyright IBM Corp. 1998 |
xxi |
Authors and Significant Contributors
Riaz Ahmad IBM, Gaithersburg
Boris Barth IBM, Germany
Bette Brody IBM, Gaithersburg
Jerzy Buczak IBM, Cary
Charlie Burger IBM, San Jose
John Casey IBM, Dallas
Walt Farrell IBM, Poughkeepsie
Steve Gracin IBM, Endicott
Judson Howard IBM, Los Angeles
Stanley Jones IBM, Endicott
Bill Keene IBM, Dallas
Ulrich Kettner IBM, Germany
Bob Leicht IBM, Endicott
Richard Lewis IBM, Gaithersburg
Jim McCoy IBM, Gaithersburg
Tom Murphy IBM, Endicott
Karl Pesendorfer IBM, Vienna, Austria
Dave Pilcher IBM, Boulder
Linda Richter IBM, Poughkeepsie
Bernd Rueckert IBM, Germany
Liz Rushton IBM, Sydney, Australia
Roger Smith IBM, Poughkeepsie
Howard Turetzky IBM, Boulder
Jon vonWolfersdorf IBM, Endicott
Frank Yaeger IBM, San Jose
Holly Yamamoto-Smith IBM, San Jose
Comments Welcome
Your comments are important to us!
We want our redbooks to be as helpful as possible. Please send us your comments about this or other redbooks in one of the following ways:
∙Fax the evaluation form found in ªITSO Redbook Evaluationº on page593 to the fax number shown on the form.
∙Use the electronic evaluation form found on the Redbooks Web sites:
For |
Internet users |
http://www.redbooks.ibm.com/ |
For |
IBM Intranet users |
http://w3.itso.ibm.com/ |
∙ Send us a note at the following address: redbook@us.ibm.com
xxii VSE to OS/390 Migration Workbook
Part 1. Planning the Migration - An Introduction
© Copyright IBM Corp. 1998 |
1 |
2 VSE to OS/390 Migration Workbook
Chapter 1. Why Customers Migrate
This chapter discusses the following topics:
1.2, Traditional Reasons for Migrating
1.3, Functional Reasons for Migrating to OS/390
1.1 A Synopsis of This Book
What do I need to read?
Executives: Read the following:
∙
∙
Part 1, ªPlanning the Migration - An Introductionº on page 1 Part 8, ªMigration Experienceº on page 527
System Programmers: Read the following:
∙
∙
∙
∙
∙
Part 1, ªPlanning the Migration - An Introductionº on page 1
Part 2, ªConverting the VSE Operating System to the OS/390 Operating Systemº on page 67
Part 4, ªConverting VSE Utilities to OS/390 Utilitiesº on page 373 Part 5, ªSetting Up the Migration Environmentº on page 399 Part 6, ªRunning Your OS/390 Systemº on page 435
Operators: Read the following:
∙ Part 6, ªRunning Your OS/390 Systemº on page 435
Application Programmers: Read the following:
∙
∙
Part 3, ªConverting VSE Languages to OS/390 Languagesº on page 247 Part 7, ªConverting your Applicationsº on page 479
This document is divided into nine parts:
∙Part 1, Planning the Migration - An Introduction
The scope of effort required to migrate from VSE to OS/390 will vary from one organization to another. Many factors must be considered when making the decision of when and how to migrate. This part discusses the reasons for migrating, factors to consider when sizing the effort, and developing a migration plan.
∙Part 2, Converting the VSE Operating System to the OS/390 Operating System
In this part the conversion of the VSE system including JCL, data storage methods, CICS, ICCF, telecommunications, spooling, and printing is discussed. Additionally, a comparison of the use of CMS and TSO is presented for those currently running VSE under VM.
∙Part 3, Converting VSE Languages to OS/390 Languages
Conversion of the various language compilers to their equivalent OS/390 language is discussed in this part. Also, any execution time differences are discussed.
© Copyright IBM Corp. 1998 |
3 |
∙Part 4, Converting VSE Utilities to OS/390 Utilities
Conversion of the VSE utilities to their equivalent OS/390 utilities is discussed in this part.
∙Part 5, Setting Up the Migration Environment
No two Information Processing environments are alike. Hardware, software, scheduling, personnel needs will be different in all cases. This part discusses preparing for and tailoring the test environment, and various hardware/software combinations and activities that can be performed in parallel.
∙Part 6, Running Your OS/390 System
The OS/390 environment is much different than the VSE environment. This part provides an orientation to the use of TSO/ISPF, OS/390 console operation, and OS/390 utilities. Additionally, the systems management philosophy with OS/390 and diagnosing problems with OS/390 are discussed.
∙Part 7, Converting your Applications
This part discusses the application program conversion process and some of the conversion tools available.
∙Part 8, Migration Experience
An example of a migration plan for the ABC company is discussed in this part.
∙Part 9, Appendixes
The appendixes provide useful information including a list of helpful publications, education information, and a chart mapping Independent Software Vendor products to OS/390 products.
1.2Traditional Reasons for Migrating
Users migrating to MVS and OS/390 over the years have done so for a variety of reasons. While the purpose of this document is to concentrate on the hows of migrating and not so much the whys, it is interesting to note some of the more typical or traditional reasons that customers migrate to OS/390.
1.2.1 Business Consolidation
Corporations, more recently, have found themselves involved in business consolidation activities. Be it for economic and/or efficiency reasons companies have been faced with the challenge of effectively addressing this type of change. Consolidating the Information Technology infrastructure is just one of these challenges. Many have found that combining the system workloads from various parts of the newly consolidated organization has produced I/T system requirements beyond the capacity of the VSE operating system. For example, attempting to combine multiple VSE images into a single system image has often created situations where multiple processor (n-way) capacity is needed. Prior to the Turbo Dispatcher (n-way processor support) in VSE/ESA V2, OS/390 (or MVS/ESA) provided the only solution. Another issue associated with combining multiple images into a single system image has been the number of VSE partitions. Similar to the case of the Turbo Dispatcher, prior to dynamic partitions in VSE/ESA V1, OS/390 (or MVS/ESA) provided a solution to this issue.
4 VSE to OS/390 Migration Workbook
1.2.2 Mergers/Acquisitions
As with corporate consolidations, mergers and acquisitions present an equal number of challenges when having to incorporate the I/S organizations of the companies involved. A challenge that clearly presents itself is when the organizations involved run different host based operating systems (such as OS/390 and VSE/ESA). In cases where it has been decided to merge the I/S organizations rather than run as autonomous entities, the issue of which operating system should become the single production operating system arises. It is often decided that because of its robust/enhanced functionality the operating system be OS/390. This, then, requires that the VSE subsystems and applications be converted to OS/390.
1.2.3 Capacity Constraints
Users running DOS/VSE and/or VSE/SP encountered system capacity constraints due to the architectural design limits imposed by VSE. The need for additional system capacity and resources due to things such as application and end user growth found many VSE users coming up against these constraints. OS/390 provided the much needed relief for users who found themselves in this situation. Fortunately, with the introduction of VSE/ESA V1 many of these constraints were removed.
VSE users now find that many of the reasons, due to architectural limits, that forced a conversion to OS/390 actually no longer exist. The following sections describe some of these constraints in greater detail.
1.2.3.1 Virtual Storage
VSE/SP provided 24-bit addressing which supported 16 megabytes of virtual storage. Users with the requirement for a large CICS partition, for example, were forced to go to multiple CICS partitions when putting up a single large CICS partition was not possible. This sometimes caused additional problems as it was often difficult to split a single CICS application into multiple CICS partitions. However, where possible, users chose to implement multiple CICS regions using the CICS Multiple Region Option (MRO). Still, with the addition of multiple CICS regions (MROs), comes the added expense of managing the MROs. And, as the MROs numbers increase, you need system management tools, such as CICSPlex System Manager for MVS/ESA (CICSPlex SM) to ease the system management burden caused by multiple CICS systems.
MVS, or OS/390, provided users with virtual storage constraint relief through 31-bit addressing capabilities. However, some users found relief with virtual address extensions (VAE) in VSE/SP V3. VSE/ESA V1 introduced 31-bit
addressing support. This now gives VSE users the ability to address up to 2GB of virtual storage. Hence, it is now possible for VSE users with large CICS partition requirements to have this requirement satisfied by VSE.
Chapter 1. Why Customers Migrate 5
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Figure 1. VAE with Three Address Spaces
Figure 1 depicts a typical VSE virtual storage configuration using Virtual Addressability Extension (VAE) introduced in VSE/SP V2. In this configuration the largest possible address space is approximately 7MB. Therefore, a single partition running in its own address space is limited to 7MB. Initially support was for only three address spaces. This was later enhanced to nine.
6 VSE to OS/390 Migration Workbook
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