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Live Deduplication Storage of Virtual Machine Images in an Open-Source Cloud
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.
Cited literature [22 references]
https://hal.inria.fr/hal-01597754
Contributor : Hal Ifip Connect in order to contact the contributor
Submitted on : Thursday, September 28, 2017 - 5:11:00 PM
Last modification on : Thursday, September 28, 2017 - 5:16:56 PM
Long-term archiving on: : Friday, December 29, 2017 - 3:18:19 PM
Contributor : Hal Ifip Connect in order to contact the contributor
Submitted on : Thursday, September 28, 2017 - 5:11:00 PM
Last modification on : Thursday, September 28, 2017 - 5:16:56 PM
Long-term archiving on: : Friday, December 29, 2017 - 3:18:19 PM
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Distributed under a Creative Commons Attribution 4.0 International License