Can ZNS SSDs be Better Storage Devices for Persistent Cache?

Chongzhuo Yang, Zhang Cao, Chang Guo, Ming Zhao, Zhichao Cao

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

Abstract

Block-based regular SSDs have been widely used as storage backends for persistent cache systems due to their explicitly lower cost and persistence compared to DRAM. However, the caching workloads are both write- and update-intensive. It incurs a large amount of device-level write amplification (WA) in the internal garbage collection (GC), which can lead to SSD lifespan and potential performance issues. Zoned Namespace SSDs (ZNS SSDs) offer a new interface for modern SSDs to overcome the limitations of regular SSDs in some use cases. As ZNS SSDs need much lower internal over-provisioning, they can offer a larger capacity compared with regular SSDs. Considering these two advantages of ZNS SSDs, we aim to explore three possible schemes to adapt the existing persistent cache system on ZNS SSDs and analyze their benefits and limitations. We conduct comprehensive evaluations to further illustrate the tradeoffs of each scheme. Based on our research and investigation, we conclude that ZNS SSDs exhibit promising results as better storage backends for persistent cache. Further, the co-design between cache management and zone management can potentially enhance the cache efficiency and performance.

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
Pages55-62
Number of pages8
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

  • Caching System
  • Write Amplification
  • ZNS SSDs

ASJC Scopus subject areas

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

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