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Virtualization may be the most successful technology ever to cross the threshold of the enterprise data center. Vastly better hardware utilization and the ability to spin up VMs on a dime has made virtualization an easy sell over the last decade, to the point where Gartner recently estimated that 70 percent of x86 workloads are virtualized.

Yet the fancy private cloud stuff on top of that virtualization layer has been slow in coming. Yes, virtualization management tools from VMware and Microsoft have enabled cloudlike behavior for servers and storage, and even OpenStack is finally getting a little enterprise traction -- but the advanced public clouds offered by Amazon, Google, IBM, Microsoft, and Rackspace deliver much more advanced autoscaling, metering, and self-service (not to mention hundreds of other services). Plus, the PaaS cloud layer for developing, testing, and deploying apps -- now offered by all major public clouds -- has found its way into relatively few enterprise data centers.

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