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Principle Based Enterprise Architecture: A Systematic Approach to Enterprise Architecture and Governance by Ian Koenig

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Chapter 20 Reliable Systems – Golden Rules and Measures

Reliable solutions do what is expected when expected. They provide measurable service in terms of responsiveness, performance, availability, and dependability62 during normal operation, as well as in a failure scenario or in the event of a disaster. Each service should have a Service Level Agreement (SLA). System level reliability generally implies no single points of failure for that system asset. Under extreme circumstances, where there may be multiple independent system failures, a service may remain reliable by treating the case as a site failure. You cannot test away all problems, so a reliable architecture makes problems easy to find and fix when they occur. Architecture issues affecting ...

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