Rajiv Totlani

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The preeminence of Web services as a tool that can support a wide range of dynamic business processes has made it the SOA tool of choice. Web services are easy to build but difficult and expensive to maintain. Monitoring and management costs weigh heavily on the ROI calculator, and in order to maximize ROI enterprises need to keep a keen eye on the support and reliability meter. In the Web services world, an application is typically a chain of services, or "links," woven together in some sequence with a Web services front end. The chain itself is weaker than the weakest link in the chain. For example, if an application consists of three service calls, each with a reliability of 0.99, 0.96, 0.97 respectively, the overall application reliability according to the laws of probability and statistics is Application Reliability = 0.99*0.96*0.97=0.92 The multiplicative eff... (more)