A proposal for method of hybrid storage system to improve sequential access transfer rate for workloads with low access locality

Takumi Sato, Takaki Nakamura, Hiroaki Muraoka

Research output: Contribution to journalArticle

Abstract

A method of hybrid storage system consisting of HDD and SSD for workloads with low access locality is proposed. In case of low access locality, it is difficult to improve transfer rate by existing methods of hybrid storage systems such as cache or tiering methods. The proposed method stores the head portion of the files into SSD, so the time for reading the head portion of the files can overlap the time for justification of magnetic head in HDD. Because of this, transfer rate can be improved to reduce the time of reading whole length of file. In this paper, we assume practical access locality and evaluate transfer rate of the proposed method and that of the existing methods. As a result, the proposed method has an advantage over existing methods when average file size is around 10MB under low access locality such as video sharing.

Original languageEnglish
Pages (from-to)1746-1754
Number of pages9
JournalIEEJ Transactions on Electronics, Information and Systems
Volume134
Issue number11
DOIs
Publication statusPublished - 2014 Nov 1

Keywords

  • Access locality
  • HDD
  • Hybrid storage
  • Rotational delay
  • SSD
  • Seek time

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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