In my conversations with organizations implementing server virtualization, I've found that there seems to be a gap opening between the number of virtual machines firms are willing to run on a server, and the maximum number that could still reasonably fit on there. It looks like this will be aggravated by newer servers that can run twice as many virtual machines, along with more mature virtualization platforms like VMware vSphere that will support up to a TB of physical RAM. How long will it be before IT is expected to support 50 or 75 VMs per server?
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Check out Galen's research.