Chapter

3. Summary of Changes to RACF Components for

OS/390

Release 4

This chapter summarizes the new and changed components of OS/390 Relea Security Server (RACF). It includes the following summary charts for c the RACF:

ŸCallable Services

Ÿ Class descriptor table (CDT)

ŸCommands

ŸData Areas

ŸExits

ŸMacros

ŸMessages

ŸPanels

ŸSYS1.SAMPLIB

ŸPublications Library

Callable Services

Figure 1 lists a new callable service. This callable service is a PSPI interface, which means that it is not intended for use in customer programs, but rather for use by other IBM components or vendor prog

Figure 1.

New Callable Services

 

 

 

 

 

 

 

Callable

 

 

 

 

Service

 

 

 

 

Name

 

Description

 

Support

 

 

 

 

 

R_admin

 

The R_admin service enables

applications

TMEto 10

 

 

manage RACF user profiles within the RACF

 

 

database.This service accepts either a function

 

 

code-driven parameter list with data fields

 

 

consisting of name-value pairs

or a preconstructed

 

 

RACF TSO command to be executed. R_admin

 

 

does NOT include the following RACF commands:

 

 

BLKUPD, RVARY, RACLINK. It also does NOT

 

 

include RACF operator commands such as

 

 

DISPLAY, RESTART, SET, SIGNOFF, STOP, and

 

 

TARGET.

 

 

 

 

 

 

 

Copyright IBM Corp. 1994, 1997

11

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IBM OS/390 manual Release, SYS1.SAMPLIB, New Callable Services, Target

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.