The sales pitch is this: Pool your computing needs with those of dozens of other customers and you won't have to keep your own programmers and troubleshooters on the payroll.

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In essence this means that the servers in a data centre are turned into a pool of computing power to be tapped into as needed rather than being used individually.

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The ultimate goal of virtualisation is to make a data centre, or even several of them, look like a single pool of computing, storage and networking resources that can be allocated as needed.

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Further, more businesses are deploying cloud computing environments in an effort to pool resources and cut costs.

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