Asymmetric RAID: Rethinking RAID for SSD Heterogeneity

Ziyang Jiao, Bryan S. Kim

Research output: Chapter in Book/Entry/PoemConference contribution

Abstract

Traditional RAID solutions (e.g., Linux MD) balance writes evenly across the array for high I/O parallelism and data reliability. This is built around the assumption that the underlying storage components are homogeneous, both in performance and capacity. However, SSDs, even for the same model, exhibit very different characteristics and degrade over time, leading to severe disk under-utilization. In this work, we present Asymmetric-RAID (Asym-RAID), a novel RAID architecture that optimizes system performance and storage utilization by exploiting heterogeneity from a larger SSD pool. Asym-RAID asymmetrically distributes data across the array to fully utilize the capacity of each SSD. To improve performance, Asym-RAID differentially exports the address space of each data stripe to the host, allowing for performance-optimized data placement. We outline the necessary changes in the storage stack for building an asymmetric RAID system and highlight its benefits.

Original languageEnglish (US)
Title of host publicationHOTSTORAGE 2024 - Proceedings of the 2024 16th ACM Workshop on Hot Topics in Storage and File Systems
PublisherAssociation for Computing Machinery, Inc
Pages101-107
Number of pages7
ISBN (Electronic)9798400706301
DOIs
StatePublished - Jul 8 2024
Event16th ACM Workshop on Hot Topics in Storage and File Systems, HOTSTORAGE 2024 - Santa Clara, United States
Duration: Jul 8 2024Jul 9 2024

Publication series

NameHOTSTORAGE 2024 - Proceedings of the 2024 16th ACM Workshop on Hot Topics in Storage and File Systems

Conference

Conference16th ACM Workshop on Hot Topics in Storage and File Systems, HOTSTORAGE 2024
Country/TerritoryUnited States
CitySanta Clara
Period7/8/247/9/24

Keywords

  • All-flash array
  • capacity
  • heterogeneity
  • modeling
  • performance
  • RAID
  • SSD

ASJC Scopus subject areas

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

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