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Alex -- a global filesystem (1992)
| Venue: | IN PROCEEDINGS OF THE 1992 USENIX FILE SYSTEM WORKSHOP |
| Citations: | 145 - 0 self |
BibTeX
@INPROCEEDINGS{Cate92alex--,
author = {Vincent Cate},
title = {Alex -- a global filesystem},
booktitle = {IN PROCEEDINGS OF THE 1992 USENIX FILE SYSTEM WORKSHOP},
year = {1992},
pages = {1--12},
publisher = {}
}
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Abstract
The Alex filesystem provides users and applications transparent read access to files in Internet anonymous FTP sites. Today there are thousands of anonymous FTP sites with a total of a few million files and roughly a terabyte of data. The standard approach to accessing these files involves logging in to the remote machine. This means that an application can not access remote files and that users do not have any of their aliases or local tools available when connected to a remote site. Users who want to use an application on a remote file must first manually make a local copy of the file. Not only is this inconvenient, it creates two more problems. First, there is no mechanism for automatically updating this local copy when the remote file changes. The users must keep track of where they get their files from and check to see if there are updates, and then fetch these. Second, many different users at the same site may have made copies of the same remote file, thus wasting disk space. Alex addresses the problems with the above approach while maintaining compatibility with the existing FTP protocol so that the large collection of currently available files can be accessed. To get reasonable performance, long term file caching must be used. Thus consistency must be addressed. Traditional solutions to the cache consistency problem do not work in the Internet FTP domain: callbacks are not an
Keyphrases
global filesystem remote file local copy thus consistency traditional solution available file internet ftp domain access remote file ftp protocol disk space standard approach reasonable performance many different user cache consistency problem remote site large collection remote file change remote machine anonymous ftp long term file application transparent read access internet anonymous ftp site alex filesystem local tool
