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"[[High-availability cluster]]s" (also known as [[failover]] clusters, or HA clusters) improve the availability of the cluster approach. They operate by having redundant [[Node (networking)|nodes]], which are then used to provide service when system components fail. HA cluster implementations attempt to use redundancy of cluster components to eliminate [[single point of failure|single points of failure]]. There are commercial implementations of High-Availability clusters for many operating systems. The [[Linux-HA]] project is one commonly used [[free software]] HA package for the [[Linux]] operating system.
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Clusters are primarily designed with performance in mind, but installations are based on many other factors. Fault tolerance (''the ability for a system to continue working with a malfunctioning node'') allows for [[horizontal scaling|scalability]], and in high-performance situations, low frequency of maintenance routines, resource consolidation (e.g. [[RAID]]), and centralized management. Advantages include enabling data recovery in the event of a disaster and providing parallel data processing and high processing capacity.<ref>{{cite web|url=http://www-03.ibm.com/systems/clusters/benefits.html|title=IBM Cluster System : Benefits|publisher=[[IBM]]|access-date=8 September 2014|archive-url=https://web.archive.org/web/20160429022854/http://www-03.ibm.com/systems/clusters/benefits.html|archive-date=29 April 2016|url-status=dead}}</ref><ref>{{cite web|url=https://technet.microsoft.com/en-us/library/cc778629(v=ws.10).aspx|title=Evaluating the Benefits of Clustering|date=28 March 2003|publisher=[[Microsoft]]|access-date=8 September 2014|archive-url=https://web.archive.org/web/20160422092651/https://technet.microsoft.com/en-us/library/cc778629%28v%3Dws.10%29.aspx|archive-date=22 April 2016|url-status=dead}}</ref>
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