Clustering in the Web Tier
All Web-enabled enterprise applications use some type of Web server to serve HTML pages back to the end user. A third-party vendor normally will provide the Web server, but some are actually built into or packaged with the application server. Either way, the end user makes a request for an HTML page that must be serviced by a Web server. If you are using a single Web server to handle the requests, the Web server is a single point of failure for your application. If the Web server were to have a serious failure and stop servicing requests, users would not be able to use the site.
Therefore, for any serious Web-enabled application that must have a high availability, it’s very important to support some type of load balancing ...
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