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7%20-%20Computer%20Systems%20Reliability - Probability and...

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Probability and Random Processes STA 3533 Module 7 Computer Systems Reliability
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Gaining terminology, classifications, methods and trends of System Reliability Learning fundamental principles of System Reliability Construct and utilize System Reliability measurements and graphs for quality characteristics Study typical typical applications of System Reliability Objectives
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Computer System Reliability Applications Systems Reliability - Organized approach to look at an entire system Note: One component can be considered a system, but usually system 1 component Computer System Hazards: 1. Dangerous Property 2. Material Failure 3. Operator Error 4. Environmental Stress
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Computer System Reliability Applications Computer System Reliability Applications - want to integrate man and machine for reliable operation 1. Eliminate as far as possible all opportunity for errors 2. Eliminate possibility of accident if error is made 3. Eliminate damage if accident does occur
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Computer System Reliability Applications Malfunctions are the reason systems fail Only one way system can work Several reasons system will not work: Failure Unprogrammed Operation Premature Activation Erroneous Outputs Components not operate @ prescribed time
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Computer System Reliability Applications Causes 1. Design Miscalculation Inadequate knowledge 2. Manufacturing Defects 3. Maintenance 4. Exceed Specified Limits 5. Environmental Effects
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Computer System Reliability Applications Minimizing System Failure Over designing – Deterministic Design Safety Factor = 1. Safety factor of 2 is twice the strength the system actually needs for particular stress 2. Measure of Over design Safety Margin
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Computer System Reliability Applications Stochastic Design Statistically modeling error Predicting failure at certain levels of confidence and precision Derating Lower Temperature (Electrical Unit) Lower Humidity Redundancy (additional backup or items to accomplish task) Reliability is the tool used for determining and analyzing system failure
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Computer System Reliability Applications Reliability Overview Reliability - Probability that a device performs as intended for the time intended It is a customer requirement that must be measured, monitored, tracked, controlled and predicted.
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