A new study says that 30% of all physical servers in data centers are comatose, or are using energy but delivering no useful information. What’s remarkable is that that percentage hasn’t changed since 2008, when a separate study showed the same thing.

The latest research was reported in a paper by Jonathan Koomey, a research fellow at Stanford University, who has done data center energy research for the U.S. Environmental Protection Agency, and Jon Taylor, a partner at the Athensis Group, a consulting firm.

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