Editing Stratus VOS (section)

{{Short description|Operating system}}
{{Refimprove|date=February 2021}}
{{Infobox OS
| name                   = VOS or OpenVOS
| caption                = Stratus VOS
| source_model           = [[Closed source]]
| developer              = [[Stratus Technologies]]
| family                 = [[Multics-like]]
| kernel_type            = [[Monolithic kernel]]
| supported_platforms    = [[Intel i860|i860]], [[x86]], [[PA-RISC]], [[68k]]
| influenced_by          = [[Multics]], [[Unix]]
| license                = Kernel: [[Stratus Technologies]]<br />Drivers, libraries, and user-land programs: [[Stratus Technologies]], Other
| website                = [http://www.stratus.com/solutions/platforms/v-series-continuum-openvos/operating-systems/ Stratus VOS]
| working_state          = Current
| latest release version = 19.3.1ag
| latest release date    = June 2022<ref>{{Cite web |title=V Series/Continuum Support Matrix {{!}} Stratus Technologies |url=https://www.stratus.com/services-support/customer-support/platform-support/os-update-release-policy/os-release-info-for-stratus-server/v-seriescontinuum-support-matrix/ |access-date=2023-01-04 |website=Stratus {{!}} Zero-touch Edge Computing |language=en-US}}</ref>
| programmed_in = [[PL/I]], [[C (programming language)|C]], [[Assembly language]]
}}

'''Stratus VOS''' ('''Virtual Operating System''') is a proprietary [[operating system]] running on [[Stratus Technologies]] [[fault-tolerant]] computer systems. VOS is available on Stratus's ftServer and Continuum platforms.<ref>{{cite web|url=http://www.stratus.com/Products.aspx|title=High Availability & Fault Tolerant Software & Solutions - Stratus Technologies|work=Stratus|accessdate=16 May 2016}}</ref> 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 [[lockstep (computing)|lockstepped]] hardware.

During the 1980s, an [[IBM]] version of Stratus VOS existed and was called the '''System/88 Operating System'''.<ref>{{cite news |title=IBM powers up System/88 line |newspaper=Computerworld |date=16 November 1987 |url=https://books.google.com/books?id=uIYmZuC4zzQC&pg=PT7}}</ref>