Wear leveling in SSDs considered harmful

Ziyang Jiao, Janki Bhimani, Bryan S. Kim

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

Abstract

We argue that wear leveling in SSDs does more harm than good under modern settings where the endurance limit is in the hundreds. To support this claim, we evaluate existing wear leveling techniques and show that they exhibit anomalous behaviors and produce a high write amplification. These findings are consistent with a recent large-scale field study on the operational characteristics of SSDs. We discuss the option of forgoing wear leveling and instead adopting capacity variance in SSDs, and show that the capacity variance extends the lifetime of the SSD by up to 2.94×.

Original languageEnglish (US)
Title of host publicationHotStorage 2022 - Proceedings of the 2022 14th ACM Workshop on Hot Topics in Storage and File Systems
PublisherAssociation for Computing Machinery, Inc
Pages72-78
Number of pages7
ISBN (Electronic)9781450393997
DOIs
StatePublished - Jun 27 2022
Event14th ACM Workshop on Hot Topics in Storage and File Systems, HotStorage 2022 - Virtual, Online, United States
Duration: Jun 27 2022Jun 28 2022

Publication series

NameHotStorage 2022 - Proceedings of the 2022 14th ACM Workshop on Hot Topics in Storage and File Systems

Conference

Conference14th ACM Workshop on Hot Topics in Storage and File Systems, HotStorage 2022
Country/TerritoryUnited States
CityVirtual, Online
Period6/27/226/28/22

Keywords

  • capacity variance
  • endurance
  • lifetime
  • SSD
  • wear leveling
  • write amplification

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Information Systems
  • Software

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