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    7 The Siphon: Managing Distant Replicated Repositories

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    This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for non-profit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of the Paris Research Laboratory of Digital Equipment Centre Technique Europe, in Rueil-Malmaison, France; an acknowledgement of the authors and individual contributors to the work; and all applicable portions of the copyright notice. Copying, reproducing, or republishing for any other purpose shall require a license with payment of fee to the Paris Research Laboratory. All rights reserved. ii The Siphon is intended to facilitate joint software development between groups working at distant sites connected by low bandwidth communication lines. It gives users the image of a single repository of individually manageable units, typically software or documentation components. Users can lock and modify each unit, the result being propagated automatically to all sites. The repository is replicated at each site, and possibly on multiple file servers for greater availability and reliability. A Siphon has been in operational use since January 198
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