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5: Compare Current Utilizations to Maximum Capacities

The intent here is to determine how much excess capacity is available for selected components. The utilization or performance of each measured component should be compared to the maximum usable capacity. Note that the maximum usable is almost always less than the maximum possible. The maximum usable server capacity, for example, is usually only 80–90%. Similar limitations apply for network bandwidth and cache storage hit ratios. By extrapolating the utilization trending reports and comparing them to the maximum usable capacity, the process owner should be able to estimate at what point in time a given resource is likely to exhaust its excess capacity. These comparisons should be updated at least monthly—if possible, weekly. As utilizations change, the point in time at which existing capacity will be exceeded should be adjusted similarly.

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