"In my vision, a datacenter (to call it your own) should be a building owned by your company, with high speed lines (OC-Something) with a security system, backup power, thought-out ventilation system, and a monitoring system to insure that you are getting the most out of your machines. A good datacenter should be big enough for expansion, but not so big that your technicians need Segway's to get to a problem (as cool as that would be). A datacenter doesn't have to be huge though, it depends on the company. A company such as UPS or FedEx may need a datacenter to ensure that all of their mission critical systems are kept up and running. No mater how big or small, to me a datacenter should be a freestanding building for security and complete control.
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Jordan
XcelHosting.NET "

Perfection jordan, this is what i think to, ciuldnt have said it better myself,