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8: Map Requirements Onto Existing Utilizations

The projected resource requirements derived from the workload projections of the users in cardinal rule #7 are now mapped onto the charts of excess utilization from cardinal rule #5. This mapping will show the quantity of new capacity that will be needed by each component to meet expected demand. For example, suppose that a company's financial systems use two production servers, each of which is running at 50% utilization. If we presume that maximum usable capacity is 80%, our excess capacity would be 30%. If the projected new resource requirements are for only an additional 25% of capacity, no new upgrades are needed. But if another 50% of capacity is needed, either existing servers must be upgraded or a new server brought in.

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