OpenVMS, often referred to as just VMS, is a multi-user, multiprocessing virtual memory-based operating system designed to support time-sharing, batch processing, transaction processing and workstation applications. It was first announced by Digital Equipment Corporation as VAX/VMS (Virtual Address eXtension/Virtual Memory System) alongside the VAX-11/780 minicomputer in 1977. OpenVMS has subsequently been ported to run on DEC Alpha systems, the Itanium-based HPE Integrity Servers, and select x86-64 hardware and hypervisors. Since 2014, OpenVMS is developed and supported by a company named VMS Software Inc. (VSI).
OpenVMS offers high availability through clustering and the ability to distribute the system over multiple physical machines. This allows clustered applications and data to remain continuously available while operating system software and hardware maintenance and upgrades are performed, or when a whole data center is destroyed. VMS cluster uptimes of 17 years have been reported. Customers using OpenVMS include banks and financial services, hospitals and healthcare, telecommunications operators, network information services, and industrial manufacturers. During the 1990s and 2000s, there were approximately half a million VMS systems in operation worldwide.
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Vasantdada Sugar Institute | Academic & Science |
Vanpec International Corporation | Business |
Vonachen Services Inc | Business |
Ventana Systems, Inc. | Business |
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VMS Software Inc | Business |
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Virtual Switch Instance | Computing |
Virtual Session Indexer | Computing |
Virtual Storage Integrator | Computing |
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Virtual Server Instance | General |
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Voluntary Sector Initiative | General |
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Value of Serious Injury | General |
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Variable Service Interval | General |
Venture Strategies Innovations | General |
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