A system architecture for enhanced availability of tightly coupled distributed systems

We present a system architecture which facilitates enhanced availability of tightly coupled distributed systems by temporarily relaxing constraint consistency. Three different types of consistency are distinguished in tightly coupled distributed systems - replica consistency, concurrency consistency...

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Bibliographic Details
Published inFirst International Conference on Availability, Reliability and Security (ARES'06) pp. 8 pp. - 407
Main Authors Osrael, J., Froihofer, L., Goeschka, K.M.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2006
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Summary:We present a system architecture which facilitates enhanced availability of tightly coupled distributed systems by temporarily relaxing constraint consistency. Three different types of consistency are distinguished in tightly coupled distributed systems - replica consistency, concurrency consistency, and constraint consistency. Constraint consistency defines the correctness of the system with respect to a set of data integrity rules (application defined predicates). Traditional systems either guarantee strong constraint consistency or no constraint consistency at all. However, a class of systems exists, where data integrity can be temporarily relaxed in order to enhance availability, i.e. constraint consistency can be traded against availability. This allows for a context- and situation-specific optimum of availability. This paper presents the basic concepts of the trading process and the proposed system architecture to enable a fine-grained tuning of the trade-off in tightly coupled distributed systems.
ISBN:9780769525679
0769525679
DOI:10.1109/ARES.2006.19