25.5.2.3 Tailoring Other Components

Other features of OS/390, such as JES2 are described in other chapters of this book. The elements of OS/390 are listed below and each has its own set of books on installation and customization.

25.5.3 Other OS/390 Elements

OS/390 is made up of base elements and optional features. Here is a list of the pieces you may have with OS/390 Version 2 Release 4. Check the latest OS/390 announcement letter, or one of the following books for a complete list:

GC28-1725,OS/390 Introduction and Release Guide GC28-1726,OS/390 Planning for Installation GC28-1963,OS/390 Parallel Sysplex Test Report

There is also a list in 2.2, ªOS/390 Components/Products/Subsystemsº on page 18.

25.5.3.1 Base Elements for Release 4

These components all come with your OS/390 system and are enabled, ready to use:

System Services - DFSMSdfp, JES2, ISPF, ICKDSF, HLASM, TSO/E and so on Systems Management Services - HCD, ICSF, SMP/E, and SystemView base Application Enablement Services - DCE AS, Encina Toolkit Executive, GDDM/MVS (PCLK & OS/2 Link), LE, OS/390 AET, SOMobjects RTL, & VisualLift RTL

UNIX Services (X/Open UNIX 95 functions)

Distributed Computing Services - DCE base, DCE DFS, and DFSMS/MVS NFS Communications Server - FFST, IBM TCP/IP, TIOC, and VTAM

LAN Services - LANRES, LAN Server, and OSA Support Facility Network Computing Services - BookServer, and Lotus Go Webserver Softcopy Services - BookManager READ/MVS, and Softcopy Print

25.5.3.2 Optional Features for Release 4

Also included in your OS/390 system are the following optionally priced features. You can use them by registering them according to the OS/390 Program Licensed Specifications, GC28-1728. See the OS/390 Announcement letter, and OS/390 Planning for Installation, GC28-1726 for details.

System Services - JES3, MVS/BDT NJE & File-to-File Security Server - RACF, and DCE Security Server

Systems Management - DFSMSdss, DFSMSrmm, DFSMShsm, HCM, RMF, and SDSF

Application Enablement Services - DFSORT, GDDM-PGF & REXX/MVS, IBM C/C++ Compiler, IBM HLASM Toolkit, LE DES, SOMobjects, and VisualLift Distributed Computing Services - DCE User Data Privacy, and IP PrintWay/NetSpool

Communications Server - IBM TCP/IP Kerberos, NPF, and OS/2 Offload Network Computing Services - Lotus Go Webserver

Softcopy Services - BookManager BUILD/MVS

416VSE to OS/390 Migration Workbook

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IBM manual Other OS/390 Elements, Tailoring Other Components, Base Elements for Release, Optional Features for Release

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.