Load Balancer High AvailabilityAvailability is crucial to handling Internet traffic. Slow responses or refused connections create dissatisfied users. Load Balancer has superior load balancing, scalability, AND high availability. Load Balancer can be configured to use a standby machine, on the same subnet, that remains ready at all times to take over load balancing if the primary Load Balancer machine fails. The high availability feature uses a heartbeat mechanism between the two Load Balancers to detect failure. The two Load Balancers have connectivity to the same clients, and the same cluster of servers, as well as connectivity between the Load Balancers. The Load Balancers synchronize information, and have built-in logic to elect the active Load Balancer that is in charge of a given cluster of servers; the standby Load Balancer is continuously synchronized for that cluster of servers. The customer-defined reach criteria identifies what can and what cannot be reached from the Load Balancer, such as access to gateway routers across duplicated adapters and networks. If the heartbeat fails, or defined reach criteria are not met, the primary Load Balancer is deemed to be down, and the standby Load Balancer takes over the forwarding of packets. Typically, the failover process will take less than five seconds, minimizing possible connection failures. Load Balancer has a mechanism to perform fast IP takeover when the logic, or an operator, decides to switch active and standby Load Balancers.
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