Virtualization

"Virtualization" generally refers to any abstraction of computing resources. In the Green ICT context, it refers to consolidating multiple logical resources onto fewer physical resources. For example, hosting multiple web sites on a single server may make the most efficient use of that hardware. The power and HVAC load due to idle computers is reduced, but care has to be taken to ensure quality of service. Vertatique.com is hosted this way to minimize its energy/carbon impact.

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Update 2010.09.01

Case Studies

Universidade Vila Velha “We’ve saved 30 percent in energy consumption costs already by reducing our physical servers…Once we completely convert to virtual machines, we expect to reduce space and energy costs by 50 percent.”

HotSchedules “Cut monthly power expenditures by 77 percent”