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High-Performance IT Services by Terry Critchley

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Chapter 5

Networks

Networks are the glue that connects processors and users to each other in various configurations and, as such, form part of the performance chain of computer systems. A system is usually as slow as the slowest link in the chains that comprise it. In addition, increased workloads affect different links in the system to different extents.

For example, if an increase in transaction workload only has a marginal effect on processor response time, it does not mean it only has the same impact on the network. The effects of such increases depend on the characteristics on the link and its position on the queuing curve of response time or throughput versus utilization (Figure 1.2).

Factors Affecting Network Performance

Some network elements ...

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