I/O holds up the traffic in virtual systems

We can now host 512 virtual machines on a single physical server. That's a lot of virtual machines trying to squeeze a lot of I/O out of a single server's networking interfaces. Meanwhile, vSphere 5 is out. It arrived with an indeterminately large quantity of truly outstanding features that were completely overshadowed by a new licensing model which imposes a hefty fine for using
most of them.

Customer feedback prompted some revisiting of that licensing philosophy. VMWare made a far more interesting move on the low end. The company upgraded the free version of the hypervisor with some new features, including a change of the RAM
allowance from 256GB to 32GB. This naturally led to fierce debates on internet forums and gave tech blogs everywhere plenty to write about.

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