Policies for Probe-Wear Leveling in MEMS-Based Storage Devices

M.G. Khatib, Pieter H. Hartel

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    Abstract

    Probes (or read/write heads) in MEMS-based storage devices are susceptible to wear. We study probe wear, and analyze the causes of probe uneven wear. We show that under real-world traces some probes can wear one order of magnitude faster than other probes leading to premature expiry of some probes. Premature expiry has severe consequences for the reliability, timing performance, energy-efficiency, and the lifetime of MEMS-based storage devices. Therefore, wear-leveling is a must to preclude premature expiry. We discuss how probe wear in MEMS-based storage is different from medium wear in Flash, calling for a different treatment. We present three policies to level probe wear. By simulation against three real-world traces, our work shows that an inevitable trade-off exists between lifetime, timing performance, and energy efficiency. The policies differ in the size of the trade-off. One of the policies maximizes the lifetime, so that it is optimal; and the other two are less optimal, and are used based on the configuration of the device.
    Original languageUndefined
    Title of host publicationProceedings of the 17th Annual Meeting of the IEEE/ACM International Symposium on Modeling, Analysis & Simulation of Computer and Telecommunication Systems (MASCOTS)
    Place of PublicationPiscataway
    PublisherIEEE Computer Society Press
    Pages152-161
    Number of pages10
    ISBN (Print)978-1-4244-4928-6
    DOIs
    Publication statusPublished - 19 Sep 2009
    Event2009 IEEE Symposium on Modeling, Analysis and Simulation of Copmputer and Telecommunication Systems, MASCOTS 2009 - London, United Kingdom
    Duration: 21 Sep 200923 Sep 2009
    Conference number: 17
    http://mascots2009.doc.ic.ac.uk/

    Publication series

    Name
    PublisherIEEE Computer Society Press
    ISSN (Print)1526-7539

    Conference

    Conference2009 IEEE Symposium on Modeling, Analysis and Simulation of Copmputer and Telecommunication Systems, MASCOTS 2009
    Abbreviated titleMASCOTS
    CountryUnited Kingdom
    CityLondon
    Period21/09/0923/09/09
    Internet address

    Keywords

    • METIS-264037
    • IR-68052
    • Wear leveling
    • EWI-16090
    • Probe Storage
    • Probe wear
    • MEMS-Based Storage

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