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A failover cluster is a group of independent computers that work together to increase the availability of applications and services. The clustered servers (called nodes) are connected by physical cables and by software. If one of the cluster nodes fails, another node begins to provide service (a process known as failover). Users experience a minimum of disruptions in service.
The failover cluster feature is available in Windows Server 2008 Enterprise and Windows Server 2008 Datacenter. The feature is not available in Windows Web Server 2008 or Windows Server 2008 Standard.
