J. Ousterhout, H.L. DaCosta, D. Harrison, J. Kunze, M. Kupfer, and J. Thompson, "A Trace-Driven Analysis of the Unix 4.2 BSD File System," Proc. of the 10th ACM Symp. on Operating System Principles, Orcas Island (December, 1985).  Home/Search   Document Not in Database   Summary   Related Articles   Check

....per month. Local Disk Caching AFS plays a critical role in supporting remote access to the file system: without local disk caching, access to files would be prohibitively slow, around 850 bytes per second after accounting for protocol overhead. For illustration, a typical UNIX file is 11K bytes [3], which translates into a dozen seconds or so over SLIP. If file accesses were forced to wade through the communications network on every read or write, the delays that ensued would be unbearable. It would be inconceivable to rely on NFS [4] over a slow link. Thanks to AFS, though, most read and ....

J. Ousterhout, H.L. DaCosta, D. Harrison, J. Kunze, M. Kupfer, and J. Thompson, "A Trace-Driven Analysis of the Unix 4.2 BSD File System," Proc. of the 10th ACM Symp. on Operating System Principles, Orcas Island (December, 1985).

....client. If the disconnected client blindly stores data back to the file server, then the other client s modifications will be overwritten. In practice these types of conflicts are rare; for example, Ousterhout et al. showed that under work loads similar to ours, write sharing rarely occurs [12], and later studies agree that in such environments, write sharing remains rare [9, 13] Our optimism has also been validated by running simulations using traces gathered from file servers that we access on a daily basis [14] 4. Running Disconnected To make disconnected AFS work, we made ....

J. Ousterhout, H.L. DaCosta, D. Harrison, J. Kunze, M. Kupfer, and J. Thompson, "A Trace-Driven Analysis of the Unix 4.2 BSD File System," Proceedings of the 10th ACM Symposium on Operating Systems Principles (December 1985).

....there is good reason to propagate logged operations aggressively. On the other hand, delaying replay offers an opportunity for optimizing the log. Ousterhout reported that most UNIX files have a lifetime under three minutes and that 30 40 of modified file data is overwritten within three minutes [16]. Using our optimizer [8] we find it typical for 70 of the operations in a large log to be eliminated. It is clear that delaying log replay can significantly reduce the amount of data propagated to the server. We may wish to enforce a minimum delay before replaying an operation, especially on ....

....does not immediately propagate changes, other users can not see modified data. Furthermore, conflicts may occur if partially connected users modify the same file. In our experience, these conflicts are rare; a substantial body of research concurs by showing that this kind of file sharing is rare [2, 11, 16]. If stronger guarantees are needed, they might be provided by server enhancements. For example, an enhanced consistency protocol might inform servers that dirty data is cached at a client; when another client requests the data, the server can demand the dirty data, as is done in Sprite [15] and ....

J. Ousterhout, H.L. DaCosta, D. Harrison, J. Kunze, M. Kupfer, and J. Thompson, "A Trace-Driven Analysis of the Unix 4.2 BSD File System," in Proc. of the 10th ACM Symp. on Operating Systems Principles, Orcas Island, WA (December 1985).

No context found.

Ousterhout85. J. Ousterhout, H. D. Costa, D. Harrison, J. Kunze, M. Kupfer and J. Thompson, "A Trace-Driven Analysis of the UNIX 4.2 BSD File System", Proc. 10th Symp. on Operating System Prin., Operating Systems Review 19, 5 (December 1985), 15-24.

No context found.

Ousterhout J.K., Da Costa H., Harrison D., Kunze J.A., Kupfer M. and Thompson J.G., "A Trace Driven Analysis of the UNIX 4.2BSD File System", Proceedings of the Tenth ACM Symp. on OS Principles, December, 1985, pp. 15-24.

No context found.

John K. Ousterhout, Herv'e Da Costa, David Harrison, John A. Kunze, Mike Kupfer, and James G. Thompson, `A trace-driven analysis of the Unix 4.2 BSD file system', Proceedings of the Tenth Symposium on Operating Systems Principles. ACM, December 1985, pp. 15--24.

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