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Practical Service Level Management: Delivering High-Quality Web-Based Services by Eric Siegel, John McConnell

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Architecture of the Server Infrastructure

Most systems use a tiered architecture, with multiple servers within each tier, as shown in Figure 9-1. Each tier has a set of servers that carry out the same function. Multiple servers in a tier can increase performance and availability because distribution of workload across redundant instances can absorb a failure. Multiple servers can also increase the flow volume because multiple flows are spread across the tier, increasing parallelism and reducing the time for application processes to execute.

Figure 9-1. Web Service Delivery Architecture

Web applications are in the first tier. They are customer ...

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