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SDN and NFV Simplified: A Visual Guide to Understanding Software Defined Networks and Network Function Virtualization by Jim Doherty

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2. Benefits of Virtual Machines

When we consider the benefits that virtualization brings, it is good to recap on why virtual machines (VMs) are necessary in the modern information technology (IT) infrastructure. The fundamental problem with the traditional IT infrastructure model is that the x86 server architecture (the way modern servers are designed and built) supports only one operating system at a time, and each operating system is typically dedicated to a single application. It would be great if we could run lots of applications on one standard server, but that’s not the way they work most of the time.

Despite the inefficiencies, there were a few benefits of the one-server/application model. Not only does this model minimize resource competition ...

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