Semantic Data Placement for Power Management in Archival Storage

Appeared in Proceedings of the 5th International Workshop on Petascale Data Storage (PDSW10), held in conjunction with SC2010.

Abstract

Power is the greatest lifetime cost in an archival system, and, as decreasing costs make disks more attractive than tapes, spinning disks account for the majority of power drawn. To reduce this cost, we propose reducing the number of times disks have to spin up by grouping together files such that a typical spin-up handles several file accesses. We calculate that in a typical system if only 30% of the total accesses occur while disks are still spinning, we can conserve 12% of the power cost. We classify files according to directory structure and see access hit rates of up to 66% for a power savings of up to 52% of the power cost of spinning up for every read in easily-separable workloads.

Publication date:
November 2010

Authors:
Avani Wildani
Ethan L. Miller

Projects:
Archival Storage
Ultra-Large Scale Storage
Prediction and Grouping

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Bibtex entry

@inproceedings{wildani10-pdsw,
  author       = {Avani Wildani and Ethan L. Miller},
  title        = {Semantic Data Placement for Power   Management in Archival
Storage},
  booktitle = {Proceedings of the 5th International Workshop on Petascale Data
Storage (PDSW10), held in conjunction with SC2010},
  month        = nov,
  year         = {2010},
}
Last modified 26 Oct 2011