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| MVS (operating system) | |
|---|---|
| Name | MVS |
| Developer | IBM |
| Family | IBM mainframe |
| Working state | Historic/Legacy |
| Source model | Closed source |
| Released | 1974 |
| Latest release | See Versions, Releases, and Successors |
| Supported platforms | IBM System/370, IBM System/390, zSeries |
MVS (operating system) is a flagship mainframe operating system introduced by IBM in the 1970s for the System/370 family and later adapted for System/390 and zSeries. It provided batch processing, multiprogramming, and virtualization features that supported large enterprises such as Bank of America, AT&T, and General Motors, and formed the foundation for transaction processing systems used by Visa, Mastercard, and national railway networks. MVS influenced subsequent systems through its integration with technologies from UNIVAC, Honeywell, and standards bodies like ANSI and ISO.
MVS combined elements of earlier products from IBM and competitors including OS/360, DOS/360, and TSS/370 while aligning with industry developments led by Dennis Ritchie, Ken Thompson, and research at Bell Labs and MIT. It supported workload management used by institutions such as Federal Reserve System, General Electric, Bank of England, and European Central Bank, and interoperated with middleware from vendors like CA Technologies, BMC Software, and CA-7. MVS was designed to handle high-throughput environments similar to NASA data centers and AT&T Bell Labs research installations.
Development of MVS drew on the legacy of projects such as OS/360 and SVS and was shaped by corporate strategies at IBM under leaders like Thomas J. Watson Jr. and project managers influenced by practitioners from Control Data Corporation and DEC. Milestones involved collaboration with standards committees at IEEE and governmental procurement by agencies including US Department of Defense and UK Ministry of Defence. Key releases occurred during eras marked by corporate events at Digital Equipment Corporation, Hewlett-Packard, and mergers such as Dell acquisitions. Vendor ecosystems including Micro Focus and Rocket Software later provided migration and interoperability pathways.
MVS employed a supervisor/kernel model with components influenced by research at Carnegie Mellon University, Stanford University, and University of California, Berkeley. Core subsystems included storage management akin to concepts from Xerox PARC, I/O subsystems comparable to designs at Sun Microsystems, and security features addressing requirements from agencies such as National Security Agency and standards like FIPS. MVS integrated with transaction monitors and databases exemplified by CICS, IMS, DB2, and third-party systems from Oracle Corporation and Sybase. Device support covered peripherals developed by Hitachi, Fujitsu, Seagate, and EMC Corporation.
Batch facilities in MVS used job control language heritage traceable to OS/360 JCL and were central to automated processing in organizations like IRS, Social Security Administration, and multinational firms such as IBM Global Services. Scheduling and queue management paralleled systems from Control Data and Unisys, while job tape and spool management interfaced with tape technologies produced by Ampex and cartridge designs from Sony and Iomega. Batch-oriented workflows often integrated with enterprise resource planning suites from SAP and mainframe-centric schedulers from CA Technologies.
MVS exposed system services and callable interfaces used by middleware from CICS, IMS, and database engines like DB2; application development leveraged languages and toolchains led by IBM offerings in COBOL, PL/I, Fortran, and later integration libraries for C and Java. Application programming interfaces supported by MVS were influenced by standards bodies including ISO and the W3C in later interoperability efforts, enabling connections to enterprise distributions from vendors such as Microsoft, Red Hat, and VMware through gateway products.
Designed for transaction volumes demanded by institutions such as Mastercard, Visa, and national telecommunications carriers, MVS emphasized high availability, fault tolerance, and online recovery modeled after practices at AT&T and Bell Labs. Performance tuning relied on capacity planning and benchmarking approaches similar to those developed at SPEC and by consultancies such as Gartner and Forrester Research. Clustering, parallelism, and workload balancing integrated concepts from Amdahl Corporation and Cray Research, while disaster recovery aligned with standards used by FEMA and major banks.
MVS evolved through releases such as MVS/SE, MVS/SP, and later z/OS lineage maintained by IBM and successors in the mainframe product family. The platform’s heritage continued in systems used by service providers like Amazon Web Services for mainframe modernization, in partnerships with firms including Accenture and Capgemini, and in migration tools from Micro Focus and Rocket Software. Academic and archival interest is preserved in libraries like Computer History Museum and repositories associated with IEEE Computer Society.
Category:IBM mainframe operating systems