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Failover clustering overview Failover clustering is mainly used for data availability. Typically in a failover cluster, there are two machines. One machine provides the basic services and the second is available to run the service when the primary system fails. The primary system is monitored periodically to check if it works. This monitoring may be performed by the failover computer or an independent system also called as cluster controller. In an event of failure of primary computer, the failover system takes control.
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