5.1. Failover Clusters
A failover cluster, also known as a High Availability cluster, is a group of two or more loosely coupled machines working together to appear as though it is a single system. A failure of a single component, which would bring down a stand-alone system, may cause only a slight outage of a service, which may or may not be noticeable, in a cluster. In order to ensure that there is no single point of failure in a cluster, clusters generally have multiple instances of the individual components that can automatically take over the function of the failed component.
Failover clusters, as we know them today, had their first commercial success starting in 1984 when Digital Equipment Corporation (DEC) released products for its TOPS-20 ...
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