Feasibility regions: exploiting tradeoffs between power and performance in disk drives

  • Authors:
  • Alma Riska;Ningfang Mi;Evgenia Smirni;Giuliano Casale

  • Affiliations:
  • Seagate Research;College of William Mary;College of William Mary;SAP Research Belfast, UK

  • Venue:
  • ACM SIGMETRICS Performance Evaluation Review
  • Year:
  • 2010

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Abstract

Low utilization immediately suggests that placing the system into a low power mode during idle times may considerably decrease power consumption. As future workload remains largely unknown, "when" to initiate a power saving mode and for "how long" to stay in this mode remains a challenging open problem, given that performance degradation of future jobs should not be compromised. We present a model and an algorithm that manages to successfully explore feasible regions of power and performance, and expose the system limitations according to both measures. Extensive analysis on a set of enterprise storage traces shows the algorithm's robustness for successfully identifying "when" and for "how long" one should activate a power saving mode given a set of power/performance targets that are provided by the user.