IBM OS/390 manual

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Contents IBM Page IBM Fourth Edition, September IBMContents Racf ConsiderationsGet IndexPspi RacfPage IBM USAUSA Page Trademarks Page How to Use This About This BookWho Should Use This Book BookWhere to Find More Information OS/390 Security Server Racf Information , PackageSK2T-2180Server Racf Information , Package see OS/390 CollectionIBM Systems Center Publications Other Sources of Information SecurityRacf home RACF-L discussion list Sample codePublications FtpFTP Servers Page PresentedRACF Planning inInstallation OS/390 VersionPage Migration Planning Considerations MigrationInstallation Considerations Administration ConsiderationsCustomization Considerations PSPAuditing Considerations Application Development ConsiderationsGeneral User Considerations Data Areas OS/390 Security ServerPage Release Overview New and Enhanced SupportEnhancements to Support for OpenEdition Services UIDRun-Time Library Services Password History EnhancementsGID Gggg needsProgram ALLNew Fmid OW24966 Enhancements toEnable/Disable Changes AccessGuide OW26237 EnhancementsCallable Services New Callable ServicesRelease SYS1.SAMPLIBClass Descriptor Table CDT GIDUID Commands Command Language ReferenceNoclauth PermitParmlib Data Areas Exits ICHRFX03ICHRFX04 Macros MessagesNew Messages Changed MessagesDeleted Messages PanelsICHP241C ICHP242AICHH241C MemberPublications Library Changes to the Racf Publications LibraryOS/390 Security Server Data Areas This No longer Licensed Publication Its New FormPlanning Considerations Migration StrategyHardware Requirements Racf Migration and Planning for Racf 1.9.2GC23-3045Compatibility OpenEdition MVSProgram Control by System ID RELEASE=2.4 Keyword onPage Installation Considerations Racf Storage ConsiderationsVirtual Storage Racf Estimated Storage UsageHow System Programmers Guide ICBPage Customization Considerations Customer Additions to the Router Table and the CDTRACF/DB2 External Security Module Customization RACF/DB2Administration Guide Volume , SC26 For OS/390 Version InstallationExit Processing OS/390 Security Server Racf System Programmers. GuideAdministration Considerations Tmeadmin ClassPassword History Changes Server Racf Security Administrators. GuideEnhancements of Global Access Checking Racroute REQUEST=LISTAuditing Considerations SMF RecordsAuditors Guide SysidPage Application Development Considerations Programming InterfacesFastauth Changes Racroute IcheintyPage General User Considerations Security Server Racf General Users. GuidePage Update GlossaryMVS AuditDirection FacilityData DirectoryEntity GIDFile HFSPassword RequestNode UnitPosit ProcessPads UtilityClassification VerifyxFile System RootSyscall Target NodeTask Verification NameProfile SetsHow to Get Your Racf CD Cics TSO/EPage Index SeeSee alsoexits IRR@XACS 19 Ispf panels LsqaPlpa SMF80DTA See alsoRRSF router tableRaclist SmfidPage Readers Comments Wed Like to Hear from You IBM Readers Comments Wed Like to Hear from YouPage IBM
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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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