- In computing, load balancing distributes workloads across multiple computing resources, such as computers, a computer cluster, network links, central processing units or disk drives. Load balancing aims to optimize resource use, maximize throughput, minimize response time, and avoid overload of any single resource
- Load Balancer is used to balance & send user request load and send it to Web Front End server for continues supplying of service to user
- Load Balancer is separate server dedicated for load balancing. Load Balancer is configured in all Web Front End server.
- Load Balancer are by default configured in application server, so there is no need to configure external load balancer.
Load balancers use different algorithms to control traffic. The goal of these algorithms is to intelligently distribute load and/or maximize the utilization of all servers within the cluster. Some examples of these algorithms include:
- Round-robin. A round-robin algorithm distributes the load equally to each server, regardless of the current number of connections or the response time. Round-robin is suitable when the servers in the cluster have equal processing capabilities; otherwise, some servers may receive more requests than they can process while others are using only part of their resources.
- Weighted round-robin. A weighted round-robin algorithm accounts for the different processing capabilities of each server. Administrators manually assign a performance weight to each server, and a scheduling sequence is automatically generated according to the server weight. Requests are then directed to the different servers according to a round-robin scheduling sequence.
- Least-connection. A least-connection algorithm sends requests to servers in a cluster, based on which server is currently serving the fewest connections.
- Load-based. A load-based algorithm sends requests to servers in a cluster, based on which server currently has the lowest load.
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