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Evolving the CERN Computing Centre Les Robertson, 9 Jan 07

This article examines the energy challenges faced by CERN's computing center due to increasing capacity demands. It discusses the uncertainty in estimating future requirements and the need for long-term planning to balance energy consumption with computational needs. The text explores different approaches to predicting energy requirements, including extrapolation methods and budget constraints. Challenges in adapting to evolving computing and networking technologies are addressed, emphasizing the importance of accurate long-term estimates. CERN management seeks improved projections to align capacity with future experiment demands, urging timely planning.

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Evolving the CERN Computing Centre Les Robertson, 9 Jan 07

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  1. Evolving the CERN Computing CentreLes Robertson, 9 Jan 07 • In order to ensure that CERN is able to fulfil its responsibilities for LHC computing, some long term planning is under way • One of the issues that emerges is the apparently (at least at present) inexorable growth of energy requirements as computing capacity increases • CERN’s estimates are that the long-term energy requirements cannot be met by simply adding power and cooling to the current computer centre • For some time now there has been an ongoing discussion on this, trying to identify a suitable building, etc. -- BUT • Now that this has been written down formally – further justification on the needs has been requested from higher management

  2. Uncertainty of the parameters Estimating the evolution of both the requirements of the experiments and the characteristics of the technology beyond 2010 necessarily involves a considerable element of guesswork. The requirements of the experiments in the early years of the next decade will depend to a large degree on the efficiency of the accelerator operation, the speed with which the design energy and luminosity are reached, the timing of the programme to upgrade the machine parameters, and the way in which the computing model of each of the experiments is adapted to the undoubted new opportunities that will be offered by the evolution of computing and networking technology. Similarly, while there are already many approaches at the R&D stage to evolve high throughput computing technology over the next five to ten years, the reality will be strongly dependent on market factors.

  3. Requirements estimates Major constraint - respond to the needs of the experiments within the anticipated long term budget Initial approach : Simply extrapolating the current requirements by assuming the same percentage increase in computational and storage capacity as in 2009-2010 for each subsequent year until 2020.

  4. The result is considerably lower than that which would have been obtained by using Moore’s Law extrapolation, which has been used effectively in recent years to predict the capacity that can be purchased within a fixed budget Because of this it is expected that this could be achieved (purchase plus energy costs) within the fixed budget constraint, while keeping the total energy requirements within reason (~20% of the accelerator)

  5. But the CERN management requires a better estimate of the requirements • While CERN IT needs to complete a plan by the autumn in order to ensure enough capacity for 2009 • When could the experiments provide some long term estimates?

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