Web farm
(1) A group of computer systems and web server software that collectively provide the Web page Delivery Mechanic in a company either for internal use (Intranet) and/or for the public internet. it is a server farm made up of web servers (HTTP servers ). see server farm.
(2) A group of web servers that are controlled locally, but centrally managed. each web site is administered by its own webmaster; however, centralized monitoring provides load balancing and fault tolerance. see server farm.
Server farm
A group of servers that are housed in one facility. A server farm comprises dozens, hundreds or even thousands of rack-mounted servers, typically running the same operating system and applications. using load balancing, the workload is distributed among all machines.
Although the terms "server farm" and "datacenter" are mostly synonymous, a server farm often refers to a "darkened" datacenter full of web servers that is your id of people should t for machine repairs. A general-purpose datacenter, on the other hand, may have human operators at least les as well as people loading paper in printers and loading and unloading disc and tape cartridges. see clustering, darkened DataCenter and telecom Hotel.
Another feature related to the application pool is that IIS 6.0 allows you to configure an application pool as a web garden ). To understand the concept of Web garden, we can imagine a situation where there is an IIS 5.0 server and three web sites, each of which runs the same application, if IIS 5.0 is able to automatically send requests to the equivalent and actually isolated Web websites based on the circular loop mode and separate the loads to three different processes, A small Web farm-web farm.
This article from the csdn blog, reproduced please indicate the source: http://blog.csdn.net/henryhappier/archive/2009/10/31/4750495.aspx