9.4. A More Realistic Approach: A Queuing Network
As discussed in Chapter 4, a typical e-business site architecture is composed of a number of interconnected servers including Web servers, application servers, and database servers. Suppose that one wants to know what the site performance would be if five new Web servers were added to a given configuration of an e-business site. Can this question be answered by a single queue model? When one models the whole site as a single queue, one loses the ability to represent the role of each server in the system. Thus, the above question would hardly be answered by a system-level model. In capacity planning, models are essential because they are able to predict adequately the performance of a system with ...
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