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Green, or environmentally friendly, computing is an idea whose time has come. Besides harming the environment, energy-inefficient datacenters can hurt the bottom line and lead to serious competitive disadvantages. A common inefficiency is server sprawl, the explosive growth of underutilized, overprovisioned servers across the enterprise. Server consolidation through virtualization improves energy efficiency via the decommissioning of unneeded physical servers and higher utilization of the remaining, more energy-efficient servers. There are several approaches to server virtualization, but the greenest is operating system virtualization, as provided by Virtuozzo from Parallels. Because Virtuozzo is more efficient than hardware virtualization or paravirtualization solutions, it achieves the highest server consolidation rations.
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