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Live Deduplication Storage of Virtual Machine Images in an Open-Source Cloud

  • Chun-Ho Ng
  • Mingcao Ma
  • Tsz-Yeung Wong
  • Patrick P. C. Lee
  • John C. S. Lui
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7049)

Abstract

Deduplication is an approach of avoiding storing data blocks with identical content, and has been shown to effectively reduce the disk space for storing multi-gigabyte virtual machine (VM) images. However, it remains challenging to deploy deduplication in a real system, such as a cloud platform, where VM images are regularly inserted and retrieved. We propose LiveDFS, a live deduplication file system that enables deduplication storage of VM images in an open-source cloud that is deployed under low-cost commodity hardware settings with limited memory footprints. LiveDFS has several distinct features, including spatial locality, prefetching of metadata, and journaling. LiveDFS is POSIX-compliant and is implemented as a Linux kernel-space file system. We deploy our LiveDFS prototype as a storage layer in a cloud platform based on OpenStack, and conduct extensive experiments. Compared to an ordinary file system without deduplication, we show that LiveDFS can save at least 40% of space for storing VM images, while achieving reasonable performance in importing and retrieving VM images. Our work justifies the feasibility of deploying LiveDFS in an open-source cloud.

Keywords

Deduplication virtual machine image storage open-source cloud file system implementation experimentation 

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Copyright information

© IFIP International Federation for Information Processing 2011

Authors and Affiliations

  • Chun-Ho Ng
    • 1
  • Mingcao Ma
    • 1
  • Tsz-Yeung Wong
    • 1
  • Patrick P. C. Lee
    • 1
  • John C. S. Lui
    • 1
  1. 1.Dept. of Computer Science and EngineeringThe Chinese University of Hong KongHong Kong

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