NDLI: The design and implementation of a log-structured file system

Content Provider	ACM Digital Library
Author	Rosenblum, Mendel Ousterhout, John K.
Copyright Year	1992
Abstract	This paper presents a new technique for disk storage management called a log-structured file system. A log-structured file system writes all modifications to disk sequentially in a log-like structure, thereby speeding up both file writing and crash recovery. The log is the only structure on disk; it contains indexing information so that files can be read back from the log efficiently. In order to maintain large free areas on disk for fast writing, we divide the log $into\textit{segments}and$ use a segment cleaner to compress the live information from heavily fragmented segments. We present a series of simulations that demonstrate the efficiency of a simple cleaning policy based on cost and benefit. We have implemented a prototype log-structured file system called Sprite LFS; it outperforms current Unix file systems by an order of magnitude for small-file writes while matching or exceeding Unix performance for reads and large writes. Even when the overhead for cleaning is included, Sprite LFS can use 70% of the disk bandwidth for writing, whereas Unix file systems typically can use only 5–10%.
Starting Page	26
Ending Page	52
Page Count	27
File Format	PDF
ISSN	07342071
e-ISSN	15577333
DOI	10.1145/146941.146943
Volume Number	10
Issue Number	1
Journal	ACM Transactions on Computer Systems (TOCS)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1992-02-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Unix Disk storage management Fast crash recovery File system organization File system performance High write performance Log-structured Logging
Content Type	Text
Resource Type	Article
Subject	Computer Science

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