Hybrid Storage System to Achieve Efficient Use of Fast Memory Area

Kazuichi Oe, Takeshi Nanri

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

    Abstract

    Hybrid storage techniques are useful methods to improve the cost performance for input-output (IO) intensive workloads. These techniques choose areas of concentrated IO accesses and migrate them to an upper tier to extract as much performance as possible through greater use of upper tier areas. Automated tiered storage with fast memory and slow flash storage (ATSMF) is a hybrid storage system situated between non-volatile memories (NVMs) and solid-state drives (SSDs). ATSMF aims to reduce the average response time for IO accesses by migrating areas of concentrated IO access from an SSD to an NVM. When a concentrated IO access finishes, the system migrates these areas from the NVM back to the SSD. Unfortunately, the published ATSMF implementation temporarily consumes much NVM capacity upon migrating concentrated IO access areas to NVM, because its algorithm executes NVM migration with high priority. As a result, it often delays evicting areas in which IO concentrations have ended to the SSD. Therefore, to reduce the consumption of NVM while maintaining the average response time, we developed new techniques for making ATSMF more practical. The first is a queue handling technique based on the number of IO accesses for NVM migration and eviction. The second is an eviction method that selects only write-accessed partial regions in finished areas. The third is a technique for variable eviction timing to balance the NVM consumption and average response time. Experimental results indicate that the average response times of the proposed ATSMF are almost the same as those of the published ATSMF, while the NVM consumption is drastically lower.

    Original languageEnglish
    Title of host publicationProceedings - 2019 7th International Symposium on Computing and Networking, CANDAR 2019
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages63-72
    Number of pages10
    ISBN (Electronic)9781728147253
    DOIs
    Publication statusPublished - Nov 2019
    Event7th International Symposium on Computing and Networking, CANDAR 2019 - Nagasaki, Japan
    Duration: Nov 26 2019Nov 29 2019

    Publication series

    NameProceedings - 2019 7th International Symposium on Computing and Networking, CANDAR 2019

    Conference

    Conference7th International Symposium on Computing and Networking, CANDAR 2019
    CountryJapan
    CityNagasaki
    Period11/26/1911/29/19

    All Science Journal Classification (ASJC) codes

    • Computer Science Applications
    • Computer Networks and Communications
    • Hardware and Architecture
    • Signal Processing

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