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J. Osrael, L. Froihofer, K. Göschka, S. Beyer, P. Galdamez, F. Munoz-Escoí:
"A System Architecture for Enhanced Availability of Tightly coupled Distibuted Systems";
Talk: ARES 2006 Proceedings, Wien, Österreich; 04-20-2006 - 04-22-2006; in: "Proceedings of the First International Conference on Availability, Reliability and Security", IEEE Computer Society, P2567 (2006), ISBN: 0-7695-2567-9; 400 - 407.

We present a system architecture which facilitates enhanced availability of thightly coupled distributed systems by temporarily relaxing constraaint consistency.
Three different types of consistency are distinguished in tightlycoupled 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 system 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 tunign of the trade-off in tightly coupled distributed systems.

http://dx.doi.org/10.1109/ARES.2006.19