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Failover
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== History == The term "failover", although probably in use by engineers much earlier, can be found in a 1962 declassified [[NASA]] report.<ref>[https://archive.org/details/NasaAudioHighlightReels NASA Postlaunch Memorandum Report for Mercury-Atlas], June 15, 1962.</ref> The term "switchover" can be found in the 1950s<ref>Petroleum Engineer for Management - Volume 31 - Page D-40</ref> when describing '"Hot" and "Cold" Standby Systems', with the current meaning of immediate switchover to a running system (hot) and delayed switchover to a system that needs starting (cold). A conference proceedings from 1957 describes computer systems with both Emergency Switchover (i.e. failover) and Scheduled Failover (for maintenance).<ref>[https://books.google.com/books?id=qzxNAAAAYAAJ&q=switchover Proceedings of the Western Joint Computer Conference], Macmillan 1957</ref>
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