About This Book

This book contains information about the Resource Access Control Facilit which is part of the OS/390 Security Server. The Security Server has components:

ŸRACF

ŸOpenEdition DCE Security Server

For information about the OpenEdition DCE Security Server, see the publ related to that component.

This book provides information to guide you through the migration proc OS/390 Release 3 Security Server (RACF) or RACF to OS/390 Release 4 Se Server (RACF).

The purpose of

this book is

to ensure

an

orderly

transition to

a

ne

It notis intended

for

customers

installing

RACF

for

the

first

time

or

ins

release prior to Security Server (RACF) Release

3.

First-time RACF cust

should readOS/390 Security Server (RACF) Introductionand use the program

 

 

directory shipped

with the

product when

they

are

ready

to

install

Who Should Use This Book

This book is intended for experienced system programmers responsible migrating from OS/390 Release 3 Security Server (RACF) to OS/390 Release Security Server (RACF). This book assumes you have knowledge of OS/390 Release 3 Security Server (RACF).

If you are migrating from a RACF 2.2, or earlier, or from an OS/390 release prior to OS/390 Release 3, you should also read previous ve book, as described in “Migration Paths for OS/390 Release 4 Security (RACF)” on page 21.

How to Use This

Book

 

 

 

 

 

 

 

 

 

 

This book

is

organized in the following order:

 

 

 

Ÿ

Chapter 1,

“Planning for Migration” on page 1, provides information to

 

plan

your

installation's migration to the new release of RACF.

 

Ÿ

Chapter 2,

“Release Overview” on page 5, provides

an overview

of s

 

the

new release.

 

 

 

 

 

 

 

Ÿ

Chapter 3,

“Summary

of

Changes to

RACF

Components for

OS/390

Release

 

4”

on

page 11,

lists

specific

new

and changed

support

for

the

ŸChapter 4, “Planning Considerations” on page 21, describes high-level

migration considerations for customers upgrading to the new release from previous levels of RACF.

ŸChapter 5, “Installation Considerations” on page 25, highlights informati about installing the new release of RACF.

Copyright IBM Corp. 1994, 1997

xi

Page 13
Image 13
IBM OS/390 manual About This Book, Who Should Use This Book, How to Use This

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.