A new availability concept for (n,k)-way cluster systems regarding waiting time
ICCSA'03 Proceedings of the 2003 international conference on Computational science and its applications: PartI
Modeling user perceived unavailability due to long response times
IPDPS'06 Proceedings of the 20th international conference on Parallel and distributed processing
Experience report: trading dependability, performance, and security through temporal decoupling
Proceedings of the 11th IFIP WG 6.1 international conference on Distributed applications and interoperable systems
Analysis of a service degradation model with preventive rejuvenation
ISAS'06 Proceedings of the Third international conference on Service Availability
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Transaction processing systems are judged by users to be correctly functioning not only if their transactions are executed correctly, but also if most of them are completed within an acceptable time limit. Therefore, we propose a definition of availability for systems for whom there is a notion of system failure due to frequent violation of response time constraints. We define the system to be available at a certain time if at that time the fraction of transactions meeting a deadline is above a certain user requirement. This definition lends to very different estimates of availability measures such as system downtimes as compared with more traditional measures. We conclude that for transaction processing systems, where the user's perception is important, our definition more correctly quantifies the availability of the system.