Lecture Operating system concepts (Sixth ed) - Chapter 16: Distributed-file systems

Chapter 16 looks at the current major research and development in distributed-file systems (DFS). The purpose of a DFS is to support the same kind of sharing when the files are physically dispersed among the various sites of a distributed system.

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operations that forms its client interface

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Location independence - file name does not need to be

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Accesses are performed on the cached copy

+ Files identified with one master copy residing at the server

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back, and so need never be written at all

+ Poor reliability; unwritten data will be lost whenever a user machine

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m Remote access on diskless, small-memory-capacity

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reclaim space allocated to record the state of crashed client processes (orphan detection and elimination)

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+ Existence of replicas should be invisible to higher levels + Replicas must be distinguished from one another by

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system for both servers and clients The client cache is a