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Reliability and SHARPE

Reliability and SHARPE. Outline. 1. What is Reliability? 2. How can you evaluate it? 3. What is SHARPE? 4. Usage of SHARPE. What is Reliability?. how long a system is continuously operational ability to function correctly over a specified period of time. Why is it so important?.

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Reliability and SHARPE

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  1. ReliabilityandSHARPE

  2. Outline 1. What is Reliability? 2. How can you evaluate it? 3. What is SHARPE? 4. Usage of SHARPE

  3. What is Reliability? • how long a system is continuously operational • ability to function correctly over a specified period of time

  4. Why is it so important? • if system is unreliable, suffer a great loss • affect the performance • no system is perfect, so we need to evaluate how reliable of it and make improvement

  5. Types of reliability • For a computer system, we can define 2 types: • Hardware reliability • Software reliability

  6. How can you evaluate it? • simulation model • - program whose execution mimics the dynamic behavior or the modeled system • analytic model • - Make a mathematical prediction of the system reliability

  7. Simulation • Advantages: • predict system behavior without having to build and measure a system • Disadvantages: • time consuming

  8. What is SHARPE? • Symbolic Hierarchical Automated Reliability and Performance Evaluator • allows users to construct and analyze performance, reliability, availability and performability models

  9. Advantages • once set up the model, it can obtain the information easily and quickly • easy to carry out sensitivity analysis • not time-consuming • easy to write the input file

  10. How to use? • After building the analytic model, then write a input file for the model • input file contains: • - state the model type • - describe the system • - analyze the result

  11. A B C C C D D E Example Below is the reliability block diagram of a system consisting 8 components:

  12. Input file 1 block block1a 2 comp A exp(0.05) 3 comp B exp(0.01) 4 comp C exp(0.3) 5 comp D exp(0.25) 6 comp E exp(0.1) 7 parallel threeC C C C 8 parallel twoD D D 9 series sys1 A B threeC twoD E 10 end 11 12 cdf(block1a) 13 expr value(10; block1a) 14 end

  13. Analysis • After an input file is ready, run the SHARPE and it will produce the result • carry out sensitivity analysis • by changing different mean to failure rate, you can obtain different combinations of result

  14. How does it link to my research? • in my research, SHARPE is used to analyze the reliability of network-centric environment • with different combinations of probability function, compared with the traditional computing environment

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