Larger size networks require DSM coherence protocols which scale well. Fault-tolerance in terms of high availability is required for data access and for uninterrupted DSM service since large-scale environments have a greater number of potentially malfunctioning components. We present a new class of coherence protocols for DSM systems whose instances o er highly available access to shared data at low operation costs. The protocols proposed scale well; an increase in the number of client sites does not increase the operation costs after a certain threshold has been reached. The results presented in this paper give strong guidelines for the overall design of DSM systems which o er highly available, uninterrupted services.
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