Question: Servers that have different operating modes offer opportunities for dynamically running different configurations in the cluster to match workload usage. Use the data in Figure

Servers that have different operating modes offer opportunities for dynamically running different configurations in the cluster to match workload usage. Use the data in Figure 6.35 for the power/performance modes for a given low-power server.

Mode High Medium Low Performance 100% 75% 59% Power 100% 60% 38%

a. If a server operator decided to save power costs by running all servers at medium performance, how many servers would be needed to achieve the same level of performance?

b. What are the CAPEX and OPEX of such a configuration?

c. If there was an alternative where you could purchase a server that is 20% cheaper but x% slower and uses y% less power, find the performance–power curve that provides a TCO comparable to the baseline server.

Mode High Medium Low Performance 100% 75% 59% Power 100% 60% 38% Figure 6.35 Power-performance modes for low-power servers.

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