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Definition of Failover
1. Noun. (computing uncountable) A means for ensuring high availability of some critical resource (such as a computer system), involving a parallel, backup system which is kept running at all times so that, upon detected failure of the primary system, processing can be automatically shifted over to the backup. ¹
2. Noun. (computing countable) An automatic switch to a secondary system on failure of the primary system. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Failover
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