Availability Modeling of SIP Protocol on IBM© WebSphere©

TitleAvailability Modeling of SIP Protocol on IBM© WebSphere©
Publication TypeJournal Article
Year of Publication2008
AuthorsK Trivedi, D Wang, DJ Hunt, A Rindos, WE Smith, and B Vashaw
JournalProceedings of the 14th Ieee Pacific Rim International Symposium on Dependable Computing, Prdc 2008
Start Page323
Pagination323 - 330
Date Published12/2008
Abstract

We present the availability model of a high availability SIP Application Server configuration on WebSphere. Hardware, operating system and application server failures are considered. Different types of fault detectors, detection delays, failover delays, restarts, reboots and repairs are considered. Imperfect coverages for detection, failover and recovery are incorporated. Computations are based on a set of interacting sub-models of all system components capturing their failure and recovery behavior. The parameter values used in the calculations are based on several sources, including field data, high availability testing, and agreedupon assumptions. In cases where a parameter value is uncertain, due to assumptions or limited test data, a sensitivity analysis of that parameter has been provided. Our analysis indicates the failure types and recovery parameters that are most critical in their impact on overall system availability. These results will help guide system improvement efforts throughout future releases of these products. © 2008 IEEE.

DOI10.1109/PRDC.2008.50
Short TitleProceedings of the 14th Ieee Pacific Rim International Symposium on Dependable Computing, Prdc 2008