HPR

High Performance Routing

HSM

Hierarchical Storage Manager

HTML

HyperText Markup Language

HTTP

HyperText Transfer Protocol

I/O

Input/Output

I/S

Information Systems

I/T

Information Technology

IBM

International Business

 

Machines

ICA

Integrated Communications

 

Adapter

ICCF

Interactive Computing and

 

Control Facility

ICF

Interactive Command Facility

ICI

Improved Control Interval

ICIP

Improved Control Interval

 

Processing

ICKDSF

Device Support Facilities

ICSF

Integrated Cryptographic

 

Service Facility

ICSS

Internet Connection Secure

 

Server

ID

IDentification/IDentifier

IDCAMS

The Program Name for

 

Access Method Services

IEBCOPY

Utility Program

IEBGENER

Utility Program

IGS

Interactive Graphics System

II

Interactive Interface

ILC

Instruction Length Code

IMF

Information Management

 

Facility

IML

Initial Microprogram Load

IMS

Information Management

 

System

IMS/DB

Information Management

 

System/Data Base

IMS/VS

Information Management

 

System/Virtual Storage

IOB

Input/Output Block

IOCP

I/O Channel Program

IOCS

Input/Output Control System

IOS

Input/Output System

IP

Internet Protocol

IPCS

Interactive Problem Control

 

System

IPDS

Intelligent Printer Data

 

Stream

IPF

Interactive Productivity

 

Facility

IPL

Initial Program Load

ISA

Initial Storage Area

ISAM

Indexed Sequential Access

 

Method

ISC

Integrated Storage Control

ISMA

Information Systems

 

Management Architecture

ISMF

Interactive Storage

 

Management Facility

ISPF

Interactive System

 

Productivity Facility

ISV

Independent Software Vendor

ITSO

International Technical

 

Support Organization

IUG

Interactive Utility Generation

IVP

Implementation Verification

 

Program

JCL

Job Control Language

JECL

Job Entry Control Language

JES

Job Entry Subsystem

JES2

A functional Extension of the

 

HASP II Program

JES3

A functional Extension of the

 

ASP Program

KANJI

A character set of symbols

 

used in Japanese Ideographic

 

Alpha

KSDS

Key Sequenced Data Set

LAN

Local Area Network

LANRES

Local Area Network Resource

 

Extension and Services

LCHILD

Logical CHILD

LCP

Language Conversion

 

Program

LE

Linkage Editor

LIBR

LIBRarian

LIC

Licensed Internal Code

LIFO

Last In First Out

LIOCS

Logical Input/output Control

 

System

LNKLST

Link Library Concatenation

LOGON

Log On

LP

Logical Partition

LPA

Link Pack Area

586VSE to OS/390 Migration Workbook

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IBM OS/390 High Performance Routing, Hierarchical Storage Manager, HyperText Markup Language, HyperText Transfer Protocol

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.