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2.7.5 Project Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.7.6 Automated Operations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.8 Cost Considerations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.9 OS/390 Documentation Resources
....................... 39
2.9.1 Introduction References
. . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.9.2 Key Documents and Other References
.................. 40
2.9.3 Web URL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Chapter 3. Developing the Plan
............................ 41
3.1 Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.1.1 References
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.1.2 Recommendations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2 Plan Components
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.1 Approach
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.2 Team
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2.3 Tasks
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.2.4 Milestone Events
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.2.5 Education
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.3 Progressive versus Mass Conversion
...................... 49
3.3.1 Approach Differences
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.3.2 Historical Perspective
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.3.3 Shared Application Files and Databases
................. 50
3.3.4 Shared Application Code
.......................... 50
3.3.5 Operations Support Staffing
......................... 50
3.3.6 Automated Operations Tools
........................ 50
3.3.7 Standardized Conversion Deliverables and Automation
........ 51
3.3.8 Risk Management
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.3.9 Complexity of Implementation
....................... 51
3.4 Plan Examples
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.4.1 Project Schedule
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.4.2 Project 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
4.1.2 OS/390′s Job Control Philosophy
...................... 70
4.2 High Level Similarities
............................... 72
4.2.1 JCL Statement and Job Layout
....................... 72
4.2.2 Spooling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.3 JCL Differences Between VSE and MVS
.................... 73
4.3.1 Job Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.3.2 JCL Expansion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.3.3 Operator Flexibility and Intervention
.................... 76
4.3.4 Allocation of Resources
........................... 78
4.3.5 Hidden JCL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.3.6 Device Address Specifications
....................... 80
4.3.7 Catalogs
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.3.8 Partition Dependent Codes in JCL
..................... 81
4.3.9 Communication Region - DATE and UPSI
................. 81
4.3.10 VSE Job Control Statements
........................ 82
4.3.11 MVS Job Control Statements
....................... 84
4.3.12 Comparison of VSE and MVS JCL - A Summary
............ 86
iv VSE to OS/390 Migration Workbook