Calculating the required CPU resources that are necessary to support the current workload is straightforward and uses the following formula:

To determine the total CPU resources required, the amount required to support future growth must also be calculated. The amount of CPU resources required for future growth will be determined by the design requirements. Based on the requirements identified in Chapter 3, The Design Factors, the environment should be designed to support a growth of 25 additional virtual machines over the next five years.

A maximum utilization threshold must also be determined and accounted for in CPU resource requirements. This threshold determines the maximum percentage of total CPU resources that will be consumed. It is unlikely that the environment would be configured to consume 100 percent of the CPU resources available. If the maximum utilization threshold is 75 percent, an additional 25 percent of CPU resources will be added to calculate the total CPU resources required:

When the maximum utilization threshold is 75%, the calculation will be as follows:

The environment must be designed to support the 167 GHz of CPU resources that are, in turn, required to support the current workloads and future workloads, and to provide for a maximum utilization threshold of 75 percent.