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Reliability and SHARPE

Learn about system reliability, how to evaluate it, and the benefits of using SHARPE for performance analysis. Discover different types of reliability and evaluation methods. Find out how to apply SHARPE in network-centric environments for improved system reliability.

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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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