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Phoenix, Arizona
Nov. 15, 2003 to Nov. 21, 2003
ISBN: 1-58113-695-1
pp: 27
Kiran Nagaraja , Rutgers University
Neeraj Krishnan , Rutgers University
Ricardo Bianchini , Rutgers University
Richard P. Martin , Rutgers University
Thu D. Nguyen , Rutgers University
Cluster-based servers can substantially increase performance when nodes cooperate to globally manage resources. However, in this paper we show that cooperation results in a substantial availability loss, in the absence of high-availability mechanisms. Specifically, we show that a sophisticated cluster-based Web server, which gains a factor of 3 in performance through cooperation, increases service unavailability by a factor of 10 over a non-cooperative version. We then show how to augment this Web server with software components embodying a small set of high-availability techniques to regain the lost availability. Among other interesting observations, we show that the application of multiple high-availability techniques, each implemented independently in its own subsystem, can lead to inconsistent recovery actions. We also show that a novel technique called Fault Model Enforcement can be used to resolve such inconsistencies. Augmenting the server with these techniques led to a final expected availability of close to 99.99%.
Kiran Nagaraja, Neeraj Krishnan, Ricardo Bianchini, Richard P. Martin, Thu D. Nguyen, "Quantifying and Improving the Availability of High-Performance Cluster-Based Internet Services", SC, 2003, SC Conference, SC Conference 2003, pp. 27, doi:10.1109/SC.2003.10046
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