In the last two of days I have received more than a couple of emails (mostly from Cisco technical sales people) about some testing that our main storage networking competitor has done to show how the power consumption of our MDS 9500 director is higher than that of their current generation of products. Everybody was giving me tons of reasons why the comparison was not correct and how real life environment were different than the test set up.I thought about posting a very long explanation of the fallacies of such a test with all of the technical details behind that, but then I realized that there may be an easier way to explain.I am in the midst of a small home remodeling project and I have to make a couple of decisions on lighting for the backyard. Guess what? One of the key decisions is about choosing the light bulbs (it’s a bit complicated as the types of lighting are varied).I had the option of putting multiple small light bulbs in the back yard (they consume less power, don’t they?) but that would be a less desirable choice. The efficiency of many small light bulbs is significantly lower than that of one large light bulb (which has been designed to light a broad space such as my back yard) and to get the same lighting power. To get the same light from multiple small bulbs distributed around the yard I would have had to consume much more power overall. Also, with many small light bulbs distributed around the yard, I would need to pull wires all around the yard to make sure that there is enough light in each corner, which creates another set of issues (installing and protecting the wiring infrastructure, etc). And I could go on forever on why this is wrong, but I think you have got the point by now.I am not going to make the story too long and we can certainly continue this discussion in the post session with more technically accurate arguments, but I hope this example makes the point.Can you tell the difference between a SAN Director and a light bulb now?