# Switchover

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'''Switchover''' is the manual switch from one system to a [redundant](/source/redundancy_(engineering)) or standby [computer](/source/computer) [server](/source/Server_(computing)), [system](/source/system), or [network](/source/computer_network) upon the failure or [abnormal termination](/source/abnormal_end) of the previously active server, system, or network, or to perform system maintenance, such as installing patches, and upgrading software or hardware.<ref> {{cite web |url=https://technet.microsoft.com/en-us/library/dd298067(v=exchg.150).aspx |title=Switchovers and Failovers  |publisher=[Microsoft](/source/Microsoft) |access-date=November 9, 2015 |quote=A switchover is a scheduled outage of a database or server that's explicitly initiated by an administrator, typically in preparation for performing a maintenance operation}}</ref>

Automatic switchover of a redundant system on an error condition, without human intervention, is called [failover](/source/failover). Manual switchover on error would be used if automatic failover is not available, possibly because the overall system is too complex. 

==See also==
* [Safety engineering](/source/Safety_engineering)
* [Data integrity](/source/Data_integrity)
* [Fault-tolerance](/source/Fault-tolerance)
* [High-availability cluster](/source/High-availability_cluster) (HA clusters)
* [Business continuity planning](/source/Business_continuity_planning)

== References ==
{{Reflist}}

Category:Engineering failures
Category:Fault-tolerant computer systems

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Adapted from the Wikipedia article [Switchover](https://en.wikipedia.org/wiki/Switchover) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Switchover?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.