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Fault Tree Analysis of parallel system for critical services

Accel

Hello Everyone,

I'm planning to develop reliability and maintainability study for data centers since it is required by the client. My method of developing this study is by using fault tree analysis. However, I am stuck with the fundamentals of Boolean algebra and not quite sure which approach to use. Below is an example

Assuming there are 2 redundant system, let's call them System 1 and System 2. These 2no. systems both have components A, B and C. These components are assumed to be identical for both System 1 and System 2 (A1, B1, C1 for System 1 and A2, B2, C2 for System 2).

Diagram below shows the approach I have used.

Which of the following fault tree above is the more appropriate representation of overall critical failure?

Regards,

Parents
  • 0

    First, your question is not well posed. A fault tree for a system failure is determined most highly by the detailed architecture of the system - what is connected to what and how. You can't sensibly ask the question in the abstract. 

    Second, a major issue with FTA is that there are no criteria for correctness. You just guess you best guess as to a FT and there is no technique to tell you if you have it right or wrong. If you are not experienced with FTs, then you need someone who is to inspect your work and comment on it.   But that is probably true for almost all the approaches you might want to try to use. 

Reply
  • 0

    First, your question is not well posed. A fault tree for a system failure is determined most highly by the detailed architecture of the system - what is connected to what and how. You can't sensibly ask the question in the abstract. 

    Second, a major issue with FTA is that there are no criteria for correctness. You just guess you best guess as to a FT and there is no technique to tell you if you have it right or wrong. If you are not experienced with FTs, then you need someone who is to inspect your work and comment on it.   But that is probably true for almost all the approaches you might want to try to use. 

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  • 0 in reply to Peter Bernard Ladkin

    Also, in addition, we are concerned at the probability of occurrences or overall estimated downtime (including failures) at each of the "outputs" of the "gates" in this kind of FTA?

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