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- .\" @(#)0.t 6.4 (Berkeley) 4/17/91
- .\"
- .EQ
- delim $$
- .EN
- .if n .ND
- .TL
- A Fast File System for UNIX*
- .EH 'SMM:14-%''A Fast File System for \s-2UNIX\s+2'
- .OH 'A Fast File System for \s-2UNIX\s+2''SMM:14-%'
- .AU
- Marshall Kirk McKusick, William N. Joy\(dg,
- Samuel J. Leffler\(dd, Robert S. Fabry
- .AI
- Computer Systems Research Group
- Computer Science Division
- Department of Electrical Engineering and Computer Science
- University of California, Berkeley
- Berkeley, CA 94720
- .AB
- .FS
- * UNIX is a trademark of Bell Laboratories.
- .FE
- .FS
- \(dg William N. Joy is currently employed by:
- Sun Microsystems, Inc, 2550 Garcia Avenue, Mountain View, CA 94043
- .FE
- .FS
- \(dd Samuel J. Leffler is currently employed by:
- Lucasfilm Ltd., PO Box 2009, San Rafael, CA 94912
- .FE
- .FS
- This work was done under grants from
- the National Science Foundation under grant MCS80-05144,
- and the Defense Advance Research Projects Agency (DoD) under
- ARPA Order No. 4031 monitored by Naval Electronic System Command under
- Contract No. N00039-82-C-0235.
- .FE
- A reimplementation of the UNIX file system is described.
- The reimplementation provides substantially higher throughput
- rates by using more flexible allocation policies
- that allow better locality of reference and can
- be adapted to a wide range of peripheral and processor characteristics.
- The new file system clusters data that is sequentially accessed
- and provides two block sizes to allow fast access to large files
- while not wasting large amounts of space for small files.
- File access rates of up to ten times faster than the traditional
- UNIX file system are experienced.
- Long needed enhancements to the programmers'
- interface are discussed.
- These include a mechanism to place advisory locks on files,
- extensions of the name space across file systems,
- the ability to use long file names,
- and provisions for administrative control of resource usage.
- .sp
- .LP
- Revised February 18, 1984
- .AE
- .LP
- .sp 2
- CR Categories and Subject Descriptors:
- D.4.3
- .B "[Operating Systems]":
- File Systems Management \-
- .I "file organization, directory structures, access methods";
- D.4.2
- .B "[Operating Systems]":
- Storage Management \-
- .I "allocation/deallocation strategies, secondary storage devices";
- D.4.8
- .B "[Operating Systems]":
- Performance \-
- .I "measurements, operational analysis";
- H.3.2
- .B "[Information Systems]":
- Information Storage \-
- .I "file organization"
- .sp
- Additional Keywords and Phrases:
- UNIX,
- file system organization,
- file system performance,
- file system design,
- application program interface.
- .sp
- General Terms:
- file system,
- measurement,
- performance.
- .bp
- .ce
- .B "TABLE OF CONTENTS"
- .LP
- .sp 1
- .nf
- .B "1. Introduction"
- .LP
- .sp .5v
- .nf
- .B "2. Old file system
- .LP
- .sp .5v
- .nf
- .B "3. New file system organization
- 3.1. Optimizing storage utilization
- 3.2. File system parameterization
- 3.3. Layout policies
- .LP
- .sp .5v
- .nf
- .B "4. Performance
- .LP
- .sp .5v
- .nf
- .B "5. File system functional enhancements
- 5.1. Long file names
- 5.2. File locking
- 5.3. Symbolic links
- 5.4. Rename
- 5.5. Quotas
- .LP
- .sp .5v
- .nf
- .B References
-