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SharePoint® 2010 Administration: Instant Reference by Milan Gross, Randy Williams

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Scale Out Web Servers

Scaling out refers to adding additional servers to increase performance, fault tolerance, or both. Scaling out the WFE role is done by using a load balancer. Load balancing works by pooling two or more servers together so that they appear to be, and function as, a single server. When a client request comes in, the load balancer intercepts the request and intelligently routes it to one of the available servers. (See Figure 5.9.) No special software is needed on the client because the load balancing is done on the back end. Load balancing is also transparent to users. Load balancing web servers is an active/active design, meaning that all servers are actively processing requests. This increases both performance and availability. ...

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