Automatically switching to a different, redundant system upon failure or abnormal termination of the currently active system. Failover can be applied to a cluster of servers, to network or storage components or any other set of redundant devices that must provide high availability because down-time would be expensive or inconvenient. It may be implemented in hardware, software or a combination.A "hot standby" is continuously active at the same time as the failed system, using some kind of load balancing to share the work, whereas a "warm standby" is ready to become active at short notice. When the failed system is operational again it may "failback", i.e. become (one of) the active system(s) or it may become a warm standby.
Last updated: 2008-01-15
failureThe inability of a system or system component to perform a required function within specified limits. A failure may be produced when a fault is encountered.
Last updated: 1996-05-13
(Or "heuristics testing") Software testing based on the knowledge of the types of errors made in the past that are likely for the system under test.
Last updated: 1996-05-16