Improving SSD Performance Using Adaptive Restricted-Copyback Operations

Duwon Hong, Myungsuk Kim, Jisung Park, Myoungsoo Jung, Jihong Kim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations

Abstract

Copyback operation can improve the performance of data migrations in SSD, but they are rarely used because of their error propagation problem. In this paper, we propose an integrated approach that maximizes the efficiency of copyback operations but does not compromise data reliability. First, we propose a novel per-block error propagation model under consecutive copyback operations. Our model significantly increases the number of successive copybacks by exploiting the aging characteristics of NAND blocks. Second, we devise a resource-efficient error management scheme that can handle successive copybacks where pages move around multiple blocks with different reliability. Experimental results show that the proposed technique can improve the IO throughput by up to 25% over the existing technique.

Original languageEnglish
Title of host publicationProceedings - 2019 IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728138541
DOIs
StatePublished - Aug 2019
Event8th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2019 - Hangzhou, China
Duration: 18 Aug 201921 Aug 2019

Publication series

NameProceedings - 2019 IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2019

Conference

Conference8th IEEE Non-Volatile Memory Systems and Applications Symposium, NVMSA 2019
Country/TerritoryChina
CityHangzhou
Period18/08/1921/08/19

Keywords

  • Copyback
  • FTL
  • NAND flash
  • Storage system

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