Shutting down servers that aren't being used is an obvious step toward getting more from an existing data center. Yet Kosten Metreweli, VP of product marketing at London-based Tideway Systems, says his company finds that between 2 percent and 5 percent of servers are never active at large enterprise data centers.
New hardware generates more heat than the older mainframes, partly because Windows servers run at 10 percent to 15 percent utilization and Unix about 25 percent. That's why so many companies look to virtualization to place more applications on each machine and use more of its capacity.
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