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Article
A cached WORM file system
Article first published online: 30 OCT 2006
DOI: 10.1002/spe.4380211203
Copyright © 1991 John Wiley & Sons, Ltd
1097-024X/asset/cover.gif?v=1&s=5a70ecca2928358eca4ff75b9921d0552ffb6539 "Software: Practice and Experience")
Additional Information
How to Cite
Quinlan, S. (1991), A cached WORM file system. Softw: Pract. Exper., 21: 1289–1299. doi: 10.1002/spe.4380211203
Publication History
- Issue published online: 30 OCT 2006
- Article first published online: 30 OCT 2006
- Manuscript Revised: 6 JUN 1991
- Manuscript Received: 2 MAR 1990
- Abstract
- References
- Cited By
Keywords:
- File systems;
- Caches;
- WORM;
- Back-up
Abstract
This paper describes a general-purpose file system that uses a write-once-read-many (WORM) optical disk accessed via a magnetic disk cache. The cache enables blocks to be modified a number of times before they are written to the WORM and increases performance. Snapshots of the file system can be made at any time without limiting the users' access to files. These snapshots reside entirely on the WORM, are accessible to the user via a second read-only file system, do not contain multiple copies of unchanged data, and can be used to rebuild the file system in the event that the disk cache is destroyed. The file system has been implemented as part of Plan 9, an experimental operating system under development at AT&T Bell Laboratories.