FStream: Managing Flash Streams in the File System


Eunhee Rho, Kanchan Joshi, Seung-Uk Shin, Nitesh Jagadeesh Shetty, Joo-Young Hwang, Sangyeun Cho, Daniel DG Lee, and Jaeheon Jeong, Samsung Electronics. Co., Ltd.


The performance and lifespan of a solid-state drive (SSD) depend not only on the current input workload but also on its internal media fragmentation formed over time. The recently proposed streams gives a means for the host system to control how data are placed on the physical media (abstrated by a stream) and effectively reduce the media fragmentation. This work proposes FStream, a file system approach to taking advantage of this facility. FStream extracts streams at the file system level and avoids complex application level data mapping to streams. Experimental results showed that FStream enhances the filebench performance by 5%-35% and reduces WAF (Write Amplification Factor) by 7%-46%. For a NoSQL database benchmark, performance is improved by up to 38% and WAF is reduced by up to 81%.

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@inproceedings {210522,
author = {Eunhee Rho and Kanchan Joshi and Seung-Uk Shin and Nitesh Jagadeesh Shetty and Jooyoung Hwang and Sangyeun Cho and Daniel DG Lee and Jaeheon Jeong},
title = {FStream: Managing Flash Streams in the File System},
booktitle = {16th {USENIX} Conference on File and Storage Technologies ({FAST} 18)},
year = {2018},
isbn = {978-1-931971-42-3},
address = {Oakland, CA},
pages = {257--264},
url = {https://www.usenix.org/conference/fast18/presentation/rho},
publisher = {{USENIX} Association},