Stratus VOS

VOS or OpenVOS
DeveloperStratus Technologies
Written inPL/I, C, Assembly language
OS familyMultics-like
Working stateCurrent
Source modelClosed source
Latest release19.3.1bx / May 2025
Supported platformsi860, x86, PA-RISC, 68k
Kernel typeMonolithic kernel
Influenced byMultics, Unix
LicenseKernel: Stratus Technologies
Drivers, libraries, and user-land programs: Stratus Technologies, Other
Official websiteStratus VOS

Stratus VOS (Virtual Operating System, now renamed as OpenVOS) is a proprietary operating system running on Stratus Technologies fault-tolerant computer systems. VOS is available on Stratus's ftServer and Continuum platforms. VOS customers use it to support high-volume transaction processing applications which require continuous availability. VOS is notable for being one of the few operating systems which run on fully lockstepped hardware.

During the 1980s, an IBM-branded version of Stratus VOS existed and was called the System/88 Operating System.

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