Introduction to Akkyei Servers clustering
Basically there are 3 types of clusters, Fail-over, Load-balancing and HIGH Performance Computing, The most deployed ones are probably the Failover cluster and the Load-balancing Cluster.
We Use Fail-over Cluster and Load-balancing
Fail-over Clusters consist of 2 or more network connected computers with a separate heartbeat connection between the 2 hosts. The Heartbeat connection between the 2 machines is being used to monitor whether all the services are still in use: as soon as a service on one machine breaks down the other machines try to take over.
load-balancing clusters the concept is that when a request for say a web-server comes in, the cluster checks which machine is the least busy and then sends the request to that machine. Actually most of the times a Load-balancing cluster is also a Fail-over cluster but with the extra load balancing functionality and often with more nodes.