Kate's Comment

Thoughts on British ICT, energy & environment, cloud computing and security from Memset's MD

Energy-efficient cloud computing: Jevons Paradox vs. Moore’s Law

I am in my final year of a part-time PhD attempting to answer whether Moore’s Law (which has accurately predicted that computational power will roughly double per unit of cost or unit of energy every two years for some time) will mitigate the Jevons Paradox (see inset) in relation to energy efficiency of ICT thus allowing ICT to be an…

What Is Cloud Computing?

Here I provide a less technical description of cloud computing, which can be regarded as essentially the provision of computing resources and/or software as a utility, in the same way that your business uses familiar utilities, such as electricity, water, gas etc. Cloud computing enables you to pay for computing resources as you need them. These services are provided over the internet, on a consumption-based pay-as-you-use model, with short-term contracts and without up-front expenditure.

Energy of downloads

The music and movies industry are keen to tell us how enormously energy intensive downloading media can be. But just how much energy does get used when you download stuff from the Internet? I plugged some numbers from our data centre into my calculator to find out! The answer? About 5.9 Watt-hours per Megabyte, but as little as 1.8 Wh/MB for some configurations.

IaaS vs. PaaS vs. SaaS definition

One of the areas on which we reached clear agreement in the G-Cloud and App Store phase 2 was the definition the layers of the stack, infrastructure, platform and software, and their corresponding scalable, standardised counterparts: infrastructure as a service (IaaS), platform as a service (PaaS) and software as a service (SaaS). Pleasingly, our delinations were very similar to prior work from two decades ago by IBM, except that ours incorporate virtualisation.

BCS video debate: IT policies and your green credentials

Back in February this year I tool part in one of a series of video debates on green IT hosted by the BCS as one of four “industry experts”. The topic was “IT policies and your green credentials”. Watch the video here…

BCS Data Centre Cost & Energy Simulator beta released

The British Computer Society’s Data Centre Specialist Group has released a beta version of their data centre cost and energy simulator to members of the specialist group. The simulator has come out of the Carbon Trust’s Low Carbon Collaboration initiative jointly funded by BCS and Romonet. Here are my first impressions from the preview a few weeks ago.

Sweat the desktops, replace the servers

People keep going around and around in circles on the debate of whether you should replace servers and desktops sooner rather than later when you take into account the improvements in energy efficiency in recent years combined with the embedded energy cost of manufacture of computers. So, I decided to get out my calculator and made some interesting conclusions. Materials,…