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failover
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failover : FOLDOC
failover
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.
(2008-01-15)



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