The purpose here is not to predict or estimate project costs but to identify major cost elements and any relevant financial resource considerations.

Cost/Benefit Requirements

￿Reasonable and predictable timeframe

￿Reduced internal staff participation focused on learning OS/390

￿No delay/postponement of development and maintenance

￿Controlled costs turned into investment

￿Low risk

Migration project cost elements

ÞGeneral

-Education

Course fees

Travel & living expenses

-Consultants

-Internal human resources (chargebacks)

Project manager

Team members

ÞHardware

-Incremental/interim configuration to support migration

LPAR (CTCs, channels, device channel adapters, EMIF)

Separate footprint (w/ additional software licenses)

-Final configuration

ÞSoftware

-Incremental/interim configuration to support migration

VM

Conversion Tools

VSE & OS/390 licenses

-Final OS/390 configuration (including optional products & ISV products)

2.9OS/390 Documentation Resources

OS/390 documentation resources should be consulted as early on in the project as possible. This should be done in order to get an understanding of some of the issues associated with installing and implementing the OS/390 environment. For example, it will be necessary to understand the various OS/390 delivery mechanisms (that is, CBIPO, ServerPAC, SystemPac) in order to determine the one most appropriate based upon the given requirements/environment.

2.9.1 Introduction References

Key CD-ROM Collections (Bookshelves) for OS/390

General Information Manual (Introduction and Release Guide)

Chapter 2. Sizing the Effort

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IBM manual OS/390 Documentation Resources, Introduction References

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.