A Server Farm or server cluster is a collection of computer servers usually maintained by an enterprise to accomplish server needs far beyond the capability of one machine.
Server farms often have backup servers, which can take over the function of primary servers in the event of a primary server failure. Server farms are typically co-located with the network switches and/or routers which enable communication between the different parts of the cluster and the users of the cluster.The computers, routers, power supplies, and related electronics are typically mounted on 19-inch racks in a server room or data center.
Server farms are commonly used for cluster computing. Many modern supercomputers comprise giant server farms of high-speed processorsconnected by either Gigabit Ethernet or custom interconnects such as Infiniband or Myrinet. Web hosting is a common use of a server farm; such a system is sometimes collectively referred to as a web farm. Other uses of server farms include scientific simulations (such as computational fluid dynamics) and the rendering of 3D computer generated imagery (also see render farm).
Server farms are increasingly being used instead of or in addition to mainframe computers by large enterprises, although server farms do not yet reach the same reliability levels as mainframes. Because of the sheer number of computers in large server farms, the failure of individual machines is a commonplace event, and the management of large server farms needs to take this into account, by providing support for redundancy, automaticfailover, and rapid reconfiguration of the server cluster.