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Using two or more computer systems that work together. It generally refers to multiple servers that are linked together in order to handle variable workloads or to provide continued operation in the event one fails. Each computer may be a multiprocessor system itself. For example, a cluster of four computers, each with four CPUs, would provide a total of 16 CPUs processing simultaneously.




Clustering
A cluster of servers provides fault tolerance and/or load balancing. If one server fails, one or more additional servers are still available. Load balancing distributes the workload over multiple systems.