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.