TY - CHAP T1 - Architecting and Implementing Versatile Dependability T2 - Architecting Dependable Systems III Y1 - 2005 A1 - Tudor Dumitras A1 - Srivastava, Deepti A1 - Narasimhan, Priya ED - Lemos, Rogério de ED - Gacek, Cristina ED - Romanovsky, Alexander KW - Operating systems KW - software engineering AB - Distributed applications must often consider and select the appropriate trade-offs among three important aspects – fault-tolerance, performance and resources. We introduce a novel concept, called versatile dependability, that provides a framework for analyzing and reasoning about these trade-offs in dependable software architectures. We present the architecture of a middleware framework that implements versatile dependability by providing the appropriate ”knobs” to tune and re-calibrate the trade-offs. Our framework can adjust the properties and the behavior of the system at development-time, at deployment-time, and throughout the application’s life-cycle. This renders the versatile dependability approach useful both to applications that require static fault-tolerance configurations supporting the loss/addition of resources and changing workloads, as well as to applications that evolve in terms of their dependability requirements. Through a couple of specific examples, one on adapting the replication style at runtime and the other on tuning the system scalability under given constraints, we demonstrate concretely how versatile dependability can provide an extended coverage of the design space of dependable distributed systems. JA - Architecting Dependable Systems III T3 - Lecture Notes in Computer Science PB - Springer Berlin Heidelberg SN - 978-3-540-28968-5, 978-3-540-31648-0 UR - http://link.springer.com/chapter/10.1007/11556169_10 ER -