Centralized computing: Difference between revisions

Revision as of 19:42, 15 May 2010

Revision as of 19:43, 15 May 2010

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This type of arrangement does have some disadvantages. The central computer performs the computing functions and controls the remote terminals. This type of system relies totally on the central computer. Should the central computer [[crash (computing)|crash]], the entire system will "go down" (i.e. will be unavailable).

== History ==

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The very first computers did not have separate terminals as such; their primitive input/output devices were built in. However, soon it was found to be extremely useful for multiple people to be able to use a computer at the same time, for reasons of cost - early computers were very expensive, both to produce and maintain, and occupied large amounts of floor space. The idea of centralized computing was born. Early [[text terminal]]s used electro-mechanical [[teletypewriter]]s, but these were replaced by [[cathode ray tube]] displays (as found in 20th century televisions and computers). The text terminal model dominated computing from the 1960s until the rise to dominance of [[home computer]]s and [[personal computer]]s in the 1980s.

== Contemporary status ==

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In addition, [[Mainframe computer|mainframe]]s are still being used for some mission-critical applications, such as payroll, or for processing day-to-day account transactions in banks. These mainframes will typically be accessed either using [[terminal emulator]]s (real terminal devices are not used much any more) or via modern front-ends such as [[web application]]s - or (in the case of automated access) [[Communications protocol|protocols]] such as [[web service]]s protocols.

== Hybrid client model ==

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Some organisations use a [[hybrid client]] model partway between centralized computing and conventional desktop computing, in which some applications (such as [[web browser]]s) are run locally, while other applications (such as critical business systems) are run on the [[terminal server]]. One way to implement this is simply by running [[remote desktop software]] on a standard [[desktop computer]].

== Hosted computing model ==

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A relatively new method of centralized computing, '''hosted computing''', solves many of the problems associated with traditional distributed computing systems. By centralizing processing and storage on powerful server hardware located in a data center, rather than in a local office, it relieves organizations of the many responsibilities in owning and maintaining an information technology system. These services are typically delivered on a subscription basis by an [[application service provider]] (ASP).<ref name="coredesktop">[http://www.coredesktop.com/purpose.htm Core Desktop Solutions, Inc. &ndash;]. Retrieved on 5 September 2007.</ref>

== References ==

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{{reflist|2}}

== See also ==

* [[Time sharing]]

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* [[Linux Terminal Server Project]]

* [[Terminal Services]]

* [[Multiseat configuration|Multiseat]]

* [[Thin client]]

* [[Computer terminal]]

[[Category:Centralized computing| ]]

[[Category:Cloud computing]]

[[es:Computación centralizada]]