A multiple-file write scheme for improving write performance of small files in Fast File System

  • Authors:

  • Woo Hyun Ahn;Kyungjae Lee;Jaewon Oh;Kyungsub Min;Joon Sung Hong

  • Affiliations:

  • Department of Computer Science, Kwangwoon University, Wolgye-Dong, Nowon-Gu, Seoul, 139-701 Republic of Korea;Department of Computer Science, Kwangwoon University, Wolgye-Dong, Nowon-Gu, Seoul, 139-701 Republic of Korea;School of Computer Science and Information Engineering, The Catholic University of Korea, Yeokgok2-Dong, Wonmi-Gu, Bucheon, Gyeonggi-Do, Republic of Korea;Media Solution Center, Digital Media & Communications Business, Samsung Electronics Co., LTD, Maetan3-dong, Yeongtong-gu, Suwon, Gyeonggi-do, 443-742 Republic of Korea;Media Solution Center, Digital Media & Communications Business, Samsung Electronics Co., LTD, Maetan3-dong, Yeongtong-gu, Suwon, Gyeonggi-do, 443-742 Republic of Korea

  • Venue:
  • Information Processing Letters
  • Year:
  • 2009

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Abstract

Fast File System (FFS) stores files to disk in separate disk writes, each of which incurs a disk positioning (seek + rotation) limiting the write performance for small files. We propose a new scheme called co-writing to accelerate small file writes in FFS without sacrificing its advantages. The scheme collects writes to small files in the same directory and stores them together to disk in a single large disk write. Co-writing multiple files in one disk I/O can reduce disk positioning times resulting from small file writes in FFS. Our experiments on OpenBSD show that the co-writing slashes the cost of small file writes in FFS by up to 33%, in both real-world and synthetic benchmarks.