Capacity Planning for Computer Systems by Tim Browning

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By Tim Browning

Intends to use the techniques of potential making plans to computers with a mix of dimension, modelling and analytical tools for exact projection of desktop workload and source characterization

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The activity unitbased approach concentrates on the application or type of processing being done and translates these to resource utilization forecasts. Artis [2] points out that both approaches to workload characterization depend on the partitioning of the workload into a set of classes that display some degree of homogeneity. The resource-based approach is most applicable to the forecasting of existing workloads and the activity unit-based approaches are more appropriate for new applications.

A statistical analysis of the distribution of service time by hour over a month or more could provide a percentile distribution of response times. It would be realistic to promise what at least 90 percent of the distribution exhibits, especially if this is a value less than the point where the customers complain in significant numbers. Thus, the analyst derives a prescriptive initial value, which could be recommended to management. Batch processing is more complicated. Data must be analyzed separately for the major resource classes of batch work.

A service-level agreement is a formal document and may be structured according to the demands of senior management within the enterprise. Typically, the agreement will have five major sections. These include a prologue, service details, the standard offerings of MIS, the performance objectives, and how award points are determined. 52 Capacity Planning for Computer Systems The first section, or prologue, will include a statement of intent of the agreement. It states that MIS will provide certain services as detailed later in the document, and, in exchange, the customer will agree to cooperate in forecasting future resources to deliver these services.

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