In computing, failover is automatic switching to a redundant or standby computer server, system, hardware component or network upon the failure or abnormal termination of the previously active application,server, system, hardware component, or network. Failover and switchover are essentially the same operation, except that failover is automatic and usually operates without warning, while switchover requires human intervention.
taken from http://en.wikipedia.org/wiki/Failover
How ever when the main server recovers, requests are then again sent to the main server.
There are 3 main type of fail overs
- clod failover : Should do manually
- warm failover : failover happens automatically. But the transaction may abort due to the failure of data synchronization.
- hot failover : happens automatically. Data synchronization also happens. Therefore can continue operation without a problem.
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