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IBM OS/390 manual Inventory, Resources

Models: OS/390

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34.3 Inventory

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1500 COBOL programs - mix of DOS/VS COBOL and COBOL II

2600 RPG programs

80 Assembler programs

8000 JCL steps

34.4 Resources

In this project it was sometimes hard to get the various groups to focus on the migration when needed. This was because of other priorities with day to day problems and projects. This is not all that uncommon, especially in a growing organization. This however, needs to be monitored closely or delays in the project will result.

∙Systems programmers

￿Three systems programmers on VSE. An experienced MVS systems programmer was hired at project start. One VSE/VM systems programmer worked almost exclusively on VM/VSE until near switchover (normal ongoing VM/VSE support). One other programmer split time between VSE and MVS. The new MVS systems programmer spent full time on MVS.

￿Two database administrators/programmers. Both split time between VSE and MVS.

∙Application programmers

￿Two applications programmers were used with primary focus on the MVS project in the early stages of the project. These people would draw on other resources in their group as needed (for example, during testing). As the levels of testing progressed so did the number of application programmers required.

∙Operations

￿Early in the project there was not much involvement from the operations group as the systems support group performed many of those functions. There was some involvement from some of the key operations people during planning phases. As the project progressed there was more involvement from operations.

∙Management

￿A second line manager took the responsibilities of project manager. Although much of his time was spent on normal day to day responsibilities, the majority of his time was devoted to managing this project.

∙Consultants

￿IBM Global Services teamed with Automated Migration Services for overall project management and to actually perform the migration. IBM also performed various systems programming tasks as required. In addition, ISV vendors were contracted during various phases of the project to perform customization/education of their products.

530VSE to OS/390 Migration Workbook

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IBM OS/390 manual Inventory, Resources
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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.