NVM-based Write Amplification Reduction to Avoid Performance Fluctuation of Flash Storage

플래시 스토리지의 성능 지연 방지를 위한 비휘발성램 기반 쓰기 증폭 감소 기법

  • 이은지 (충북대학교 소프트웨어학과) ;
  • 정민성 (충북대학교 소프트웨어학과) ;
  • 반효경 (이화여자대학교 컴퓨터공학과)
  • Received : 2016.06.11
  • Accepted : 2016.08.05
  • Published : 2016.08.31


Write amplification is a critical factor that limits the stable performance of flash-based storage systems. To reduce write amplification, this paper presents a new technique that cooperatively manages data in flash storage and nonvolatile memory (NVM). Our scheme basically considers NVM as the cache of flash storage, but allows the original data in flash storage to be invalidated if there is a cached copy in NVM, which can temporarily serve as the original data. This scheme eliminates the copy-out operation for a substantial number of cached data, thereby enhancing garbage collection efficiency. Experimental results show that the proposed scheme reduces the copy-out overhead of garbage collection by 51.4% and decreases the standard deviation of response time by 35.4% on average.


Supported by : 한국연구재단


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