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<p><b>Abstract</b>—DSM coherence protocols should scale well for large networks. Fault-tolerance in terms of highly available data access and uninterrupted DSM service is needed in large-scale environments that have a greater number of potentially malfunctioning components. We present a new class of <it>dynamic</it> coherence protocols for DSM systems in error-prone networks whose instances offer highly available access to DSM data at low operation costs. The approach is based on the highly scalable Boundary-Restricted (BR) coherence protocol class. The new protocol class, called the <it>Dynamic Boundary-Restricted</it> (DBR) coherence protocol class, maintains read/write frequencies of DSM requests at run-time. This information is used to dynamically adjust the minimum number of cached copies of a single DSM page in order to guarantee a given degree of data availability. The description of the new protocol class is accompanied by an analysis covering a large variety of workloads. This analysis presents the overall savings achieved by using a DBR coherence protocol in comparison to a static BR protocol.</p>
Distributed systems, fault-tolerance, availability, distributed shared memory, dynamic coherence protocols, adaptability, stochastic modeling.

O. E. Theel and B. D. Fleisch, "A Dynamic Coherence Protocol for Distributed Shared Memory Enforcing High Data Availability at Low Costs," in IEEE Transactions on Parallel & Distributed Systems, vol. 7, no. , pp. 915-930, 1996.
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