SPG

Service Planning Guide

SPI

System Programming

 

Interface

SPIE

Specify Program Interruption

 

Exit

SPOOL

Simultaneous Peripheral

 

Operation On-Line

SPUFI

SQL Processor Using File

 

Input

SQL

Structured Query Language

SQL/DS

Structured Query

 

Language/Data System

SQLCA

SQL Communication Area

SRL

Systems Reference Library

SRM

Systems Resources Manager

SSI

SubSystem Interface

SSP

System Services Program

STAE

Specify Task Abnormal Exit

STC

Started Task Control

SVA

Shared Virtual Area

SVC

SuperVisor Call instruction

SVS

Single Virtual Storage

SYSADM

SYStem ADMinistrator

SYSDEF

SYStem DEFinition

SYSIN

SYStem INput stream

SYSLOG

SYStem LOG

SYSOUT

SYStem OUTput stream

SYSREC

SYStem RECorder file

SYSRES

SYStem RESidence file

TCAM

TeleCommunications Access

 

Method

TCB

Task Control Block

TCP/IP

Transmission Control

 

Protocol/Internet Protocol

TCT

Terminal Control Table

TECB

Timer Event Control Block

TM

TradeMark

TME

Tivoli Management

 

Environment

TMM

Tape Management

 

Methodology

TOD

Time Of Day

TOR

Terminal Owning Region

TOS

Tape Operating System

TP

TeleProcessing

TPF

Transaction Processing

 

Facility

TRS

Time Recording System

TSO

Time Sharing Option

TSO/E

Time Sharing Option

 

Extensions

TSO/VTAM

Time Sharing Option/Virtual

 

Telecommunications Access

 

Method

UACC

User ACCess

UCB

Universal Character Buffer

UCS

Universal Character Set

UCS2

ISO 10646 16-bit Character

 

Encoding Standard

UPSI

Use Program Switch Indicator

URL

Uniform Resource Locator

USASCII

Deprecated Term for ASCII

VAE

Virtual Addressability

 

Extension

VM

Virtual Machine

VM/CMS

Virtual

 

Machine/Conversational

 

Monitor System

VM/ESA

Virtual Machine/Enterprise

 

Systems Architecture

VMA

Virtual Machine Assist

VMPRF

VM Performance Reporting

 

Facility

VS

Virtual Storage

VSAM

Virtual Storage Access

 

Method

VSCR

Virtual Storage Constraint

 

Relief

VSE

Virtual Storage Extended

VSE/ESA

Virtual Storage

 

Extended/Enterprise Systems

 

Architecture

VSE/ICCF

Virtual Storage

 

Extended/Interactive

 

Computing and Control

 

Facility

VSE/POWER

Virtual Storage

 

Extended/Priority Output

 

Writers, Execution Peocessors

VSE/SP

Virtual Storage

 

Extended/System Package

VSE/VSAM

Virtual Storage

 

Extended/Virtual Storage

 

Access Method

List of Abbreviations 589

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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.
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