Journal of Digital Contents Society (디지털콘텐츠학회 논문지)

Digital Contents Society (한국디지털콘텐츠학회)
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An Asymmetric Buffer Management Policy for SSD

SSD를 위한 비대칭 버퍼 관리 기법

  • Received : 2011.04.18
  • Accepted : 2011.05.23
  • Published : 2011.06.30
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Abstract

Recently the Solid State Drive (SSD) is widely used for storage system of various mobile devices. In this case, existing buffer replacement algorithms based on the hard disk do not consider characteristics of flash memory, so it caused performance degradation of the system. This paper proposes a novel buffer replacement policy called ABM (Asymmetric Buffer Management) policy. ABM policy separates read and write buffer space and applies different replacement unit and replacement algorithm for each buffer. In addition, write buffer delay scheme and dynamic size adaptation algorithm is applied for better performance. ABM outperforms other replacement policies, especially ABM-LRU-CLC shows 32% better performance than normal LRU policy.

최근 다양한 기기에서 플래시 메모리 저장장치인 SSD가 활용되고 있다. SSD 기반 시스템에서 기존 하드 디스크 기반 버퍼 교체 알고리즘은 플래시 메모리의 특성을 고려하지 않고 이는 시스템의 성능 저하의 원인이 된다. 본 논문에서는 SSD의 특성을 고려하여 읽기 버퍼와 쓰기 버퍼를 분리하고 각각의 버퍼에 서로 다른 크기의 교체 단위와 서로 교체 알고리즘을 적용하는 ABM (Asymmetric Buffer Management) 정책을 제안한다. 추가적으로 제안한 정책을 보완하기 위해 쓰기 교체 지연 정책, 동적 크기 적응화 알고리즘을 적용하였다. 제안한 ABM 정책은 효과적으로 성능을 향상시키는 것으로 나타났으며, 특히 여러 알고리즘 중 가장 성능이 좋은 ABM-LRU-CLC의 경우 기존의 LRU에 비해 최대 32% 성능이 향상되는 것으로 나타났다.

Keywords

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