Chapter 32. Conversion Process
Chapter 31. Diagnosing System Problems

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

. . . . . . . . . . . . . . . . . . . . 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

. . . . . . . . . . . . . . . . . . . . . . . . . . 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

32.4.5Phase 3: Customization or Development of Conversion Tools . . . 501

32.5Conversion Phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503

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IBM OS/390 manual 495

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.