The CMDB – a Green Dimension

Whenever I speak about Green IT, I assert that most IT Managers don’t know how much electricity their IT infrastructure consumes. Some challenge my statement and state categorically that they know exactly how much electricity they use because it is separately metered. Usually, however, this turns out to be the Data Centre alone. It does not include the vast amount of infrastructure out there on the network: user desktops; switches; routers; departmental printers; etc.

It’s an almost impossible task to keep track of the power consumption of everything out there – or is it?

We have a powerful tool at our disposal in the CMDB. We only need to ascertain the power usage of a device once and can record that in the CMDB and very quickly total the power usage of all of those devices across the network. Sure, we need to factor in service hours (likely switch-on time) and our model will never be as accurate as direct measurement. However it will give us a pretty good estimate and, more importantly, it will help us determine trends – are we getting better or worse – and will help us model the effect of changes to the standard roll-out.

I fully appreciate that not all service management tool-providers will include this level of detail at the moment; but with the rapidly rising cost of electricity and the increasing importance of a green agenda; it won’t be long before they do.

Stuart Sawle

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