Editing NonStop (server computers) (section)

==Hardware==
[[File:TNSII.jpg|thumb|A NonStop server in 1987.]]
The HPE Integrity NonStop computers are a line of [[fault-tolerant]], message-based server computers based on the [[Intel]] [[Xeon]] processor platform,<ref name="hpe-brochure">{{cite web |url=https://assets.ext.hpe.com/is/content/hpedam/documents/4aa4-2000-2999/4aa4-2988/4aa4-2988enw.pdf |title=HPE NonStop family of systems}}</ref> and optimized for transaction processing. Average availability levels of 99.999% have been observed.<ref>{{cite web |url=http://h20223.www2.hp.com/NonStopComputing/cache/426962-0-0-225-121.html?jumpid=reg_R1002_USEN |title=Compare system availability in the real world |publisher=Hewlett-Packard |date=October 2006 |access-date=7 August 2010 |archive-url=https://web.archive.org/web/20110712224623/http://h20223.www2.hp.com/NonStopComputing/cache/426962-0-0-225-121.html?jumpid=reg_R1002_USEN |archive-date=12 July 2011 |url-status=dead}}</ref> NonStop systems feature a [[massively parallel processing]] (MPP) architecture and provide linear scalability. Each CPU runs its own copy of the OS, and systems can be expanded up to over 4000 CPUs. This is a [[shared-nothing architecture]] — a "share nothing" arrangement also known as [[loose coupling#In integration|loosely coupled multiprocessing]].

Due to the integrated hardware/software stack and a [[single system image]] for even the largest configurations, system management requirements for NonStop systems are rather low. In most deployments there is just a single production server, not a complex [[server farm]].{{Citation needed|date=November 2022}}

Most customers also have a backup server in a remote location for [[IT disaster recovery]]. There are standard products to keep the data of the production and the backup server in sync, for example, HPE's Remote Database Facility (RDF),<ref>{{cite web |date=July 2020 |title=Engineered for the Highest Availability |url=https://www.hpe.com/psnow/doc/4aa4-2988enw.pdf?jumpid=in_pdfviewer-psnow |access-date=25 February 2023 |page=14 |language=English}}</ref> hence there is fast takeover and little to no data loss also in a disaster situation with the production server being disabled or destroyed.

HP also developed a [[data warehouse]] and [[business intelligence]] server line, [[HP Neoview]], based on the NonStop line. It acted as a [[database server]], providing NonStop OS and [[NonStop SQL]], but lacked the [[transaction processing]] functionality of the original NonStop systems. The line was [[application retirement|retired]], and no longer [[marketing|marketed]], as of 24 January 2011.<ref>{{cite web |last=Morgan |first=Timothy Prickett |title=HP euthanizes Neoview data warehouse iron |url=https://www.theregister.com/2011/01/24/hp_kills_neoview_appliance/ |access-date=27 April 2023 |website=theregister.com |language=en}}</ref>