Split-reclaim method for eliminating metadata cache de-allocation latency in enterprise file servers

Takayuki Fukatani, Keiichi Matsuzawa, Hitoshi Kamei, Masakuni Agetsuma, Takaki Nakamura

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    This paper presents an analysis of a performance bottleneck in enterprise file servers using Linux and proposes a modification to this operation system for avoiding the bottleneck. The analysis shows that metadata cache de-allocation of current Linux causes large latency in file-request processing when the operational throughput of a file server becomes large. To eliminate the latency caused by metadata cache de-allocation, a new method, called 'split reclaim', which divides metadata cache de-allocation from conventional cache de-allocation, is proposed. It is experimentally shown that the split-reclaim method reduces the worst response time by more than 95% and achieves three times higher throughput under a metadata-intensive workload. The split-reclaim method also reduces latency caused by cache de-allocation under a general file-server workload by more than 99%. These results indicate that the split-reclaim method can eliminate metadata cache de-allocation latency and makes it possible to use low-cost commodity servers as enterprise file servers.

    Original languageEnglish
    Title of host publication2012 Digest APMRC - Asia-Pacific Magnetic Recording Conference
    Subtitle of host publicationA Strong Tradition. An Exciting New Look!
    Publication statusPublished - 2012 Dec 1
    Event2012 Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!, APMRC 2012 - Singapore, Singapore
    Duration: 2012 Oct 312012 Nov 2

    Publication series

    Name2012 Digest APMRC - Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!

    Other

    Other2012 Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!, APMRC 2012
    CountrySingapore
    CitySingapore
    Period12/10/3112/11/2

    Keywords

    • Linux
    • file server
    • memory management
    • scalability

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials

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