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==Clusters==

==Clusters==

Servers are often grouped into server clusters.  These clusters usually consist of at least two server computers which could operate independently.  They are generally made to improve performance of a website or other virtual server--this is especially important for popular websites.<ref>http://compnetworking.about.com/od/basicnetworkingconcepts/g/network_servers.htm</ref> For example, each server computer may support up to 1,000 clients, but if a website receives more than this at a time, it will be overloaded.  With a cluster, however, clients will be distributed throughout the available servers to avoid overload.<ref>https://technet.microsoft.com/en-us/library/cc785197%28v=ws.10%29.aspx</ref>

Servers are often grouped into server clusters.  These clusters usually consist of at least two server computers which could operate independently.  They are generally made to improve performance of a website or other virtual server—this is especially important for popular websites.<ref>http://compnetworking.about.com/od/basicnetworkingconcepts/g/network_servers.htm</ref> For example, each server computer may support up to 1,000 clients, but if a website receives more than this at a time, it will be overloaded.  With a cluster, however, clients will be distributed throughout the available servers to avoid overload.<ref>https://technet.microsoft.com/en-us/library/cc785197%28v=ws.10%29.aspx</ref>

Many large websites and services use clusters, including Amazon.{{citation needed}}

Many large websites and services use clusters, including Amazon.{{citation needed}}