Disconnected Operation in the Coda File System

Disconnected operation is a mode of operation that enables a client to continue accessing critical data during temporary failures of a shared data repository. An importan~ though not exclusive, application of disemmceted operation is in supprting portable computers. In this paper, we show that disconmxted operation is feasible, efficient and usable by describkg its design and implementation in the Coda File System. ‘f’he central idea behind our work is that caching of data, now widely used for performance, can also be exploited to improve availability.

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