Cluster Computing

, Volume 16, Issue 1, pp 27–37 | Cite as

Imbalance of CPU temperatures in a blade system and its impact for power consumption of fans

  • Yuetsu KodamaEmail author
  • Satoshi Itoh
  • Toshiyuki Shimizu
  • Satoshi Sekiguchi
  • Hiroshi Nakamura
  • Naohiko Mori


We are now developing a new metric of data center power efficiency to fairly evaluate the contribution of each improvement for power efficiency. In order to develop it, we built a testbed of a data center and measured power consumption of each components and environmental variables in some detail, including the power consumption and temperature of each node, rack and air conditioning unit, as well as load on the CPU, Disk I/O and the network. In these measurements we found that there was a significant imbalance of CPU temperatures that caused an imbalance in the power consumption of fans. We clarified the relationship between CPU load and fan speed, and showed that scheduling or rearrangement of nodes could reduce the power consumption of fans. We reduced fan power consumption by a maximum of 62% and total power consumption by a maximum of 12% by changing the scheduling of five nodes, changing the nodes used from hot nodes to cool nodes.


Data center Power consumption Power efficiency CPU temperature Fan speed 


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Yuetsu Kodama
    • 1
    Email author
  • Satoshi Itoh
    • 2
  • Toshiyuki Shimizu
    • 2
  • Satoshi Sekiguchi
    • 2
  • Hiroshi Nakamura
    • 3
  • Naohiko Mori
    • 4
    • 5
  1. 1.Graduate School of System and Information EngineeringUniversity of TsukubaTsukubaJapan
  2. 2.Information Technology Research InstituteNational Institute of Advanced Industrial Science and Technology (AIST)TsukubaJapan
  3. 3.Department of Information Physics and ComputingThe University of TokyoTokyoJapan
  4. 4.Applied Network Integration Business UnitNTT Advanced Technology CorporationTokyoJapan
  5. 5.Innovative IP Architecture CenterNTT Communications CorporationTokyoJapan

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