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SSD-based Workload Characteristics and Their Performance Implications

Published: 08 January 2021 Publication History

Abstract

Storage systems are designed and optimized relying on wisdom derived from analysis studies of file-system and block-level workloads. However, while SSDs are becoming a dominant building block in many storage systems, their design continues to build on knowledge derived from analysis targeted at hard disk optimization. Though still valuable, it does not cover important aspects relevant for SSD performance. In a sense, we are “searching under the streetlight,” possibly missing important opportunities for optimizing storage system design.
We present the first I/O workload analysis designed with SSDs in mind. We characterize traces from four repositories and examine their “temperature” ranges, sensitivity to page size, and “logical locality.” We then take the first step towards correlating these characteristics with three standard performance metrics: write amplification, read amplification, and flash read costs. Our results show that SSD-specific characteristics strongly affect performance, often in surprising ways.

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cover image ACM Transactions on Storage
ACM Transactions on Storage  Volume 17, Issue 1
Special Section on Usenix Fast 2020
February 2021
165 pages
ISSN:1553-3077
EISSN:1553-3093
DOI:10.1145/3446939
  • Editor:
  • Sam H. Noh
Issue’s Table of Contents
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Publication History

Published: 08 January 2021
Accepted: 01 September 2020
Revised: 01 July 2020
Received: 01 January 2020
Published in TOS Volume 17, Issue 1

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Author Tags

  1. I/O workload analysis
  2. SSD
  3. locality
  4. workload characterization

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