Just checked VMWare Player, throttling (aka SpeedStep) works as expected. I don't see what this has to do with virtualization per se, it is just some OS' (hypervisors) which do not implement / activate speed throttling, just like a Linux kernel compiled without this functionality would.
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The opposite is true
In fact virtualization is a big driver of energy savings in the data center. PG&E, my local utility in Silicon Valley, offers significant financial inncentives for data centers that save energy by moving to virtualization. The facts are simple: if I run VMware ESX with 10 virtual hosts I use approximately three times more kilowatts than the same hardware consumes with an average load. But this one server replaces 10 servers with the same load pattern.
{sorry for the broken comment below]
Absolutely Wrong !!!! How can this be published ???
How could such rubish be published. By this authors math, our orginization is better to have 25 idling servers than one server running at 25-30 %. I can't believe one can be so daft. Mathematically we have seen a significant energy savings, and we plan on continuing to use VMware.
VM & Power savings
I agree. Very little thought was put into this article. Looks like something written quickly and added as filler.
David
I dont think so
I dont have a profound knowledge in virtualization but i guess the vital things which is needed for a virtualized OS is CPU, RAM and Diskspace. So here the author points out that CPU usage amounts to excessive comsumption of power but if you are going to have a separate H/W for each OS then the power comsumed by the support processors, Motherboards and n/w interfaces will shoot up compared to the virtualized setup. I was expecting that the author would present the comparison between the virtualized and non virtualized setup.
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