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Z/OS

z/OS is a 64-bit operating system for IBM z/Architecture mainframes, introduced by IBM in October 2000. It derives from and is the successor to OS/390, which in turn was preceded by a string of MVS versions. Like OS/390, z/OS combines a number of formerly separate, related products, some of which are still optional. z/OS has the attributes of modern…

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Major characteristics

CICSCOBOLIMSPL/IRACF
46 related topics

Overview

64-bitOperating systemIBMZ/ArchitectureMainframes
14 related topics

Other features

Linux on IBM ZSplunk
2 related topics

Key facts & relationships

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Available in
English and other languages
Default user interface
ISPF, z/OS Management Facility
Developer
IBM
Initial release
March 30, 2001; 25 years ago (2001-03-30) (V1R1, announced October, 2000)
Kernel type
Monolithic (uniquely hardware-assisted)
Latest release
Version 3.2 (V3R2) / September 30, 2025; 10 months ago (2025-09-30)

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Overview

Major characteristics

Other features

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Map overview Semantic statistics

Z/OS

Nodes66
Edges65
Triples261
Avg. degree1.97
Density0.030303
Components1

How this topic connects Entity context

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Z/OS

Top relations

related to Further reading · 141
Z/OS → ABCs, Alvaro Salla, Alvaro Sallao Salla, An, Andreas Horn, April, Architecture, ARM, Base, Basics, Beyond, Biondo, Bob McCormack, Capacity, Communication Server, Das Betriebssystem, Dattani, De Gruyter, December, DFSMS
related to Major characteristics · 38
Z/OS → Apache-derived, APIs, C/C, CICS, CIFS/SMB, Clang, CLIST, COBOL, FTP, HFS, HTTP, IBM Db2, IBM MQ, IMS, IPv6, ISPF, Java, JCL, LLVM, Lotus
related to Operational data collection and analysis · 12
Z/OS → Anomaly Analytics, Data Analytics, Elastic Stack, IBM, IT, Operational, Operational Log, OS, Splunk, The, This, Watson
related to 64-bit memory support · 11
Z/OS → GiB, However, IBM, Java, Linux, OS, OS Version, Release, Starting, There, Within
related to External links · 9
Z/OS → IBM, Mainframe Magazine Archived, Official IBM, OS, OS Internet LibraryIBM Systems, Product Life Cycle PolicyIBM, Shop, ShopZ, Wayback Machine
see also · 6
Z/OS → DirectorLinux, FacilitySDSFSMFSMP/Ez/TPFWebSphere Application ServerWorkload ManagerzAAP, Fujitsu MSPHiperDispatchHitachi VOS3Intelligent Resource, IBM ZParallel SysplexResource Measurement, OS, VSE
related to z/OS Encryption Readiness Technology (zERT) · 5
Z/OS → Communications Server, It, OS, OS Encryption Readiness Technology, OS V2R3
OS family · 2
Z/OS → MVS, Unix
Available in · 1
Z/OS → English and other languages
Default user interface · 1
Z/OS → ISPF, z/OS Management Facility

Important terminology Word statistics

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Important terminology

ibm os isbn support 16 pdf redbooks vol ed international technical organization retrieved august 2026 paul data system rogers smf

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Z/OSAvailable inEnglish and other languages1.00infobox
Z/OSDefault user interfaceISPF, z/OS Management Facility1.00infobox
Z/OSDeveloperIBM1.00infobox
Z/OSInitial releaseMarch 30, 2001; 25 years ago (2001-03-30) (V1R1, announced October, 2000)1.00infobox
Z/OSKernel typeMonolithic (uniquely hardware-assisted)1.00infobox
Z/OSLatest releaseVersion 3.2 (V3R2) / September 30, 2025; 10 months ago (2025-09-30)1.00infobox
Z/OSLicenseProprietary monthly license charge (MLC); pricing available based on actual use (VWLC, EWLC, AWLC, EAWLC, IWP); reduced pricing options (zELC, zNALC, "Solution Edition") for man…1.00infobox
Z/OSMarketing targetEnterprise / Mainframes1.00infobox
Z/OSOfficial websiteibm.com/products/zos1.00infobox
Z/OSOS familyMVS1.00infobox
Z/OSOS familyUnix1.00infobox
Z/OSPackage managerSMP/E1.00infobox
Z/OSSource modelClosed source with open source components1.00infobox
Z/OSSupported platformsz/Architecture1.00infobox
Z/OSUserlandMVS, UNIX System Services1.00infobox
Z/OSWorking stateCurrent1.00infobox
Z/OSWritten inprimarily PL/X, HLASM, and C/C++1.00infobox
Z/OSis a64-bit operating system for IBM z/Architecture mainframes0.90text

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