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A Case for Redundant Arrays of Hybrid Disks (RAHD)
F. Wang, N. Helian, Sining Wu, Yike Guo, Derek Deng, V. Khare, C. Liao, M. Rashidi, and A. Parker
Magnetics, IEEE Transactions on, 44 Issue:11:182-196, November 2008 [doi].Abstract
Hybrid Hard Disk Drive was originally concepted by Samsung, which incorporates a Flash memory in a magnetic disk. The combined ultra-high-density benefits of magnetic storage and the low-power and fast read access of NAND technology inspires us to construct Redundant Arrays of Hybrid Disks (RAHD) to offer a possible alternative to today��s Redundant Arrays of Independent Disks (RAIDs) and/or Massive Arrays of Idle Disks (MAIDs). We first design an internal management system (including Energy-Efficient Control) for hybrid disks. Three traces collected from real systems as well as a synthetic trace are then used to evaluate the RAHD arrays. The trace-driven experimental results show: in the high speed mode, a RAHD outplays the purely-magnetic-disk-based RAIDs by a factor of 2.4�C4; in the energy-efficient mode, a RAHD4/5 can save up to 89% of energy at little performance degradation.
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@article{3080,
author = {Wang, F. and Helian, N. and Sining Wu and Yike Guo and Derek Deng and Khare, V. and Liao, C. and Rashidi, M. and Parker, A.},
title = {{A Case for Redundant Arrays of Hybrid Disks (RAHD)}},
month = {November},
year = {2008},
pages = {182-196},
keywords = {determinacy analysis, Craig interpolants},
note = {},
doi = {10.1109/TMAG.2008.2002531},
url = {http://www.cs.kent.ac.uk/pubs/2008/3080},
publication_type = {article},
submission_id = {21408_1295451423},
ISSN = {0018-9464},
journal = {Magnetics, IEEE Transactions on},
volume = {44 Issue:11},
publisher = {IEEE},
}