Design tradeoffs for SSD reliability

Bryan S. Kim, Jongmoo Choi, Sang Lyul Min

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

4 Scopus citations

Abstract

Flash memory-based SSDs are popular across a wide range of data storage markets, while the underlying storage medium—flash memory—is becoming increasingly unreliable. As a result, modern SSDs employ a number of in-device reliability enhancement techniques, but none of them offers a one size fits all solution when considering the multidimensional requirements for SSDs: performance, reliability, and lifetime. In this paper, we examine the design tradeoffs of existing reliability enhancement techniques such as data re-read, intra-SSD redundancy, and data scrubbing. We observe that an uncoordinated use of these techniques adversely affects the performance of the SSD, and careful management of the techniques is necessary for a graceful performance degradation while maintaining a high reliability standard. To that end, we propose a holistic reliability management scheme that selectively employs redundancy, conditionally re-reads, judiciously selects data to scrub. We demonstrate the effectiveness of our scheme by evaluating it across a set of I/O workloads and SSDs wear states.

Original languageEnglish (US)
Title of host publicationProceedings of the 17th USENIX Conference on File and Storage Technologies, FAST 2019
PublisherUSENIX Association
Pages281-294
Number of pages14
ISBN (Electronic)9781939133090
StatePublished - Jan 1 2019
Externally publishedYes
Event17th USENIX Conference on File and Storage Technologies, FAST 2019 - Boston, United States
Duration: Feb 25 2019Feb 28 2019

Publication series

NameProceedings of the 17th USENIX Conference on File and Storage Technologies, FAST 2019

Conference

Conference17th USENIX Conference on File and Storage Technologies, FAST 2019
CountryUnited States
CityBoston
Period2/25/192/28/19

ASJC Scopus subject areas

  • Hardware and Architecture
  • Computer Networks and Communications
  • Software

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  • Cite this

    Kim, B. S., Choi, J., & Min, S. L. (2019). Design tradeoffs for SSD reliability. In Proceedings of the 17th USENIX Conference on File and Storage Technologies, FAST 2019 (pp. 281-294). (Proceedings of the 17th USENIX Conference on File and Storage Technologies, FAST 2019). USENIX Association.