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        A Case for Redundant Arrays of Hybrid Disks (RAHD)

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        903157.pdf (PDF, 443Kb)
        Author
        Wang, F.
        Helian, N.
        Wu, S.
        Guo, Y.K.
        Deng, D.
        Khare, V.
        Liao, C.
        Rashidi, M.
        Parker, A.
        Attention
        2299/9628
        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 2.4–4; in the energy-efficient mode, a RAHD4/5 can save up to 89% of energy at little performance degradation
        Publication date
        2008
        Published in
        IEEE Transactions on Magnetics
        Published version
        https://doi.org/10.1109/TMAG.2008.2002531
        Other links
        http://hdl.handle.net/2299/9628
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