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Noh, Sam H.
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Performance trade-offs of file system between overwriting and dynamic relocation on a solid state drive

Author(s)
Hyun, ChoulseungKwon, HunkiKim, JaehoByun, EujoonChoi, JongmooLee, DongheeNoh, Sam H.
Issued Date
2008-05-21
URI
https://scholarworks.unist.ac.kr/handle/201301/41082
Citation
International Conference on Computer, Electrical, and Systems Science and Engineering
Abstract
Most file systems overwrite modified file data and metadata in their original locations, while the Log-structured File System (LFS) dynamically relocates them to other locations. We design and implement the Evergreen file system that can select between overwriting or relocation for each block of a file or metadata. Therefore, the Evergreen file system can achieve superior write performance by sequentializing write requests (similar to LFS-style relocation) when space utilization is low and overwriting when utilization is high. Another challenging issue is identifying performance benefits of LFS-style relocation over overwriting on a newly introduced SSD (Solid State Drive) which has only Flash-memory chips and control circuits without mechanical parts. Our experimental results measured on a SSD show that relocation outperforms overwriting when space utilization is below 80% and vice versa.
Publisher
World Academy of Science, Engineering and Technology

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