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Failover and Load balancers

The Concept of Failover and how Load Balancers help in the process

Load balancing also provides the failover functionality. Failover is a concept or rather a process of the continuation of a service after the failure of one or more of components. It fails over to the next component. The components of load balancers are monitored continually and when one is non-responsive, the load balancer is informed and does not send traffic to it. When the component is back on line, the load balancer routes the traffic to it all over again. In order for this to operate, there should be at least one component outside the service’s capacity.

This is less expensive and more flexible. That is, a single “live” component is coupled with a single backup component that helps in the time of a “failure”.