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Farley "Building Storage Networks" Question...
Greetings All. I'm making my way through Farley's "Building Storage Networks". Chapter 2 Exercise Question 1 states "If a componet's reliability is calculated at 98%, what is the reliability of five of these components working together in a subsystem? What is the reliability if there are ten such components?" The chapter itself touched briefly on this topic and my Google search turned up www.zzyzx.com/products/whitepapers/pdf/ (MTBF and Availability Primer). Although very informative, it didn't seem to contain the necessary information to help me answer this question. Does anyone know if the question is asking for a percentage or are they looking for a MTBF value? Can anyone point me in the right direction? Thanks! R. Damian Koziel |
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"R. Damian Koziel" wrote in message ... Greetings All. I'm making my way through Farley's "Building Storage Networks". Chapter 2 Exercise Question 1 states "If a componet's reliability is calculated at 98%, what is the reliability of five of these components working together in a subsystem? What is the reliability if there are ten such components?" The chapter itself touched briefly on this topic and my Google search turned up www.zzyzx.com/products/whitepapers/pdf/ (MTBF and Availability Primer). Although very informative, it didn't seem to contain the necessary information to help me answer this question. Does anyone know if the question is asking for a percentage or are they looking for a MTBF value? Farley is misusing the term 'reliability' to mean 'availability' (the probability that a component or system is running at any given moment), which is covered in the paper that you found. When multiple components must all be running for a system to run, the system's availability is the product of all the individual availabilities (I assume that's what Farley is talking about, rather than N-way redundancy where the system will run if *any* of its N components is running). - bill |
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