How migrating 0.0001% of address space saves 12% of energy in hybrid storage

B.J. van der Zwaag, M.G. Khatib, Pieter H. Hartel

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    We present a simple, operating- system independent method to reduce the num- ber of seek operations and consequently reduce the energy consumption of a hybrid storage device consisting of a hard disk and a flash memory. Trace-driven simulations show that migrating a tiny amount of the address space (0.0001%) from disk to flash already results in a signi��?cant storage energy reduction (12%) at virtually no extra cost. We show that the amount of energy saving depends on which part of the address space is migrated, and we present two indicators for this, namely sequentiality and request frequency. Our simulations show that both are suitable as criterion for energy-saving ��?le placement methods in hybrid storage. We address potential wear problems in the flash subsystem by presenting a simple way to pro- long its expected lifetime.
    Original languageUndefined
    Place of PublicationEnschede
    PublisherCentre for Telematics and Information Technology (CTIT)
    Number of pages15
    Publication statusPublished - 11 Sept 2007

    Publication series

    PublisherCentre for Telematics and Information Technology, University of Twente
    ISSN (Print)1381-3625


    • SCS-Cybersecurity
    • IR-64809
    • METIS-251005
    • EWI-12874

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