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NonStop

NonStop can refer to the line of HP Integrity NonStop computers, the line ofTandem NonStop computers that

preceded them, or the NonStop OS operating system that is designed for them. NonStop systems are based on an

integrated hardware/software stack. They are self-healing systems designed with redundant components and

automatic reconfiguration in the event of a component failure, to prevent against "single-point failures" (see

Reliability engineering). The systems run the NonStop OS operating system and the database management systems

NonStop SQL and Enscribe.

These systems are often used by banks, stock exchanges, telecommunication providers and other enterprises

requiring very reliable computer systems.

History

Originally introduced in 1976 by Tandem Computers Inc., the line was later owned by Compaq (from 1997) and

Hewlett-Packard (since 2003). In 2005, the current product line of HP Integrity NonStop servers, based on Intel

Itanium microprocessors, was introduced.

Early NonStop applications had to be specially coded to be fault-tolerant. That obstacle was removed in 1983 with

the introduction of the Transaction Monitoring Facility (TMF), which handles the various aspects of fault tolerance

on the system level, transparent to the application.

NonStop OS

NonStop OS is a message-based operating system designed for software fault tolerance. It works with process pairs

and ensures that backup processes in different CPU's take over in case of a process or CPU failure. Data integrity is

maintained during those takeovers, no transactions or data are lost or corrupted.

NonStop Hardware

The HP Integrity NonStop computers are a line of fault-tolerant server computers, optimized for transaction

processing and providing an extreme level of availability and data integrity. Average availability levels of 99.999%

have been observed.[1]

NonStop systems feature a massive parallel processing (MPP) architecture and provide linear

scalability. Each CPU (systems can be expanded up to over 4000 CPUs) runs its own copy of the OS. This is a

"share nothing" arrangement and no "diminishing returns" occur as more processors are added.

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.Most customers also have a backup server in a remote location for disaster recovery. There are standard products to

keep the data of the production and the backup server in sync, hence there is fast takeover and no data loss also in a

disaster situation with the production server being disabled or destroyed.

NonStop systems are inherently very secure, no security breach by outside hackers has been reported so far.

HP also developed a data warehouse and business intelligence server line, HP Neoview, based on the NonStop line.

It acts as a database server, providing NonStop OS and NonStop SQL, but lacks the transaction processing

functionality of the original NonStop systems.

http://en.wikipedia.org/w/index.php?title=Transaction_processinghttp://en.wikipedia.org/w/index.php?title=NonStop_SQLhttp://en.wikipedia.org/w/index.php?title=Database_serverhttp://en.wikipedia.org/w/index.php?title=HP_Neoviewhttp://en.wikipedia.org/w/index.php?title=Server_computerhttp://en.wikipedia.org/w/index.php?title=Fault-toleranthttp://en.wikipedia.org/w/index.php?title=Itaniumhttp://en.wikipedia.org/w/index.php?title=Intel_Corporationhttp://en.wikipedia.org/w/index.php?title=Hewlett-Packardhttp://en.wikipedia.org/w/index.php?title=Compaqhttp://en.wikipedia.org/w/index.php?title=Tandem_Computershttp://en.wikipedia.org/w/index.php?title=Stock_exchangehttp://en.wikipedia.org/w/index.php?title=Bankhttp://en.wikipedia.org/w/index.php?title=Enscribehttp://en.wikipedia.org/w/index.php?title=NonStop_SQLhttp://en.wikipedia.org/w/index.php?title=Database_management_systemhttp://en.wikipedia.org/w/index.php?title=Operating_systemhttp://en.wikipedia.org/w/index.php?title=Reliability_engineeringhttp://en.wikipedia.org/w/index.php?title=Redundancy_%28engineering%29http://en.wikipedia.org/w/index.php?title=Operating_systemhttp://en.wikipedia.org/w/index.php?title=Computers

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Sources

Siewiorek, Daniel P.; Swarz, Robert S. (1998).Reliable Computer Systems, A K Peters, Ltd., ISBN 156881092X.

pp. 586625.

Horst, R.W. (February 1995). "TNet: a reliable system area network".IEEE Micro.

Horst, Robert W.; Harris, Richard L.; Jardine, Robert L. (1990). "Multiple instruction issue in the NonStop

Cyclone processor".Proceedings of the 17th Annual International Symposium on Computer Architecture.

pp. 216226.

Bernick, D. (2005). "NonStop advanced architecture".Proceedings of the 2005 International Conference on

Dependable Systems and Networks.

Kim, Won (March 1984). "Highly available systems for database applications".ACM Computing Surveys.

External links

HP Integrity NonStop computing[2]

HP Neoview enterprise data warehouse platform[3]

[4]

References

[1] http://h20223.www2.hp.com/NonStopComputing/cache/426962-0-0-225-121.html?jumpid=reg_R1002_USEN

[2] http://h20223.www2.hp.com/nonstopcomputing/cache/76385-0-0-225-121.aspx

[3] http://h71028.www7.hp.com/enterprise/cache/483426-0-0-225-121. html

[4] http://h20223.www2.hp.com/NonStopComputing/cache/426962-0-0-225-121.html?jumpid=reg_R1002_USEN

http://h20223.www2.hp.com/NonStopComputing/cache/426962-0-0-225-121.html?jumpid=reg_R1002_USENhttp://h71028.www7.hp.com/enterprise/cache/483426-0-0-225-121.htmlhttp://h20223.www2.hp.com/nonstopcomputing/cache/76385-0-0-225-121.aspxhttp://h20223.www2.hp.com/NonStopComputing/cache/426962-0-0-225-121.html?jumpid=reg_R1002_USENhttp://h20223.www2.hp.com/NonStopComputing/cache/426962-0-0-225-121.html?jumpid=reg_R1002_USENhttp://h71028.www7.hp.com/enterprise/cache/483426-0-0-225-121.htmlhttp://h20223.www2.hp.com/nonstopcomputing/cache/76385-0-0-225-121.aspxhttp://en.wikipedia.org/w/index.php?title=International_Conference_on_Dependable_Systems_and_Networkshttp://en.wikipedia.org/w/index.php?title=International_Conference_on_Dependable_Systems_and_Networkshttp://en.wikipedia.org/w/index.php?title=International_Symposium_on_Computer_Architecturehttp://en.wikipedia.org/w/index.php?title=IEEE_Micro

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Article Sources and Contributors 3

Article Sources and ContributorsNonStop Source: http://en.wikipedia.org/w/index.php?oldid=358079261 Contributors: Anon lynx, CoJaBo, Cybercobra, GSTZ, Itai, Jabencarsey, Jim.henderson, LilHelpa, Michal Nebyla,

Momotoshi, Mxn, Orangemike, Paranoid, Rilak, 15 anonymous edits

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