Lecture14 - mission time is short compared with MTTF 55...

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Click to edit Master subtitle style 5/13/10 Lecture 6 COP 5611 Operating Systems Spring 2010 Dan C. Marinescu Office: HEC 439 B Office hours: M-Wd 1:00-2:00 PM
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5/13/10 22 2 Lecture 14 n Reading Assignment: Chapter 8 from the online textbook n Homework 3 due on March 3 n Midterm: Wednesday March 17, the first week after Spring Break n Last time: ¨ Faults, Failures and Fault-Tolerant Design ¨ Measures of Reliability and Failure Tolerance ¨ Tolerating active Faults n Today: ¨ Coding ¨ Replication ¨ Voting ¨ Repair n Next time ¨ Tolerating Software and Hardware Faults
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5/13/10 Quad-component super-diode 33
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5/13/10 Triple-redundant super-module with three voters 44 M 1 M 2 M 3 V 1 V 2 V 3
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5/13/10 Reliability increases for triple-modular redundancy when
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Unformatted text preview: mission time is short compared with MTTF 55 .00025 .0005 .001 Mission time, in units of MTTF 1.0000 0.9997 0.9993 0.9990 0.9987 0.9983 0.999 one engine .999997 three engines .00075 5/13/10 When mission time is comparable with MTTF reliability for the triple modular redundancy decreases 66 1.0 0.8 0.6 0.4 0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.25 single engine 0.15 three engines previous figure Mission time, in units of MTTF 5/13/10 5 4 3 2 1 Number of still working replicas time 5MR with fail-fast replicas fails 5MR with purging fails 5MR with fail-vote fails correctly Failure points for a five-modular redundancy system...
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Lecture14 - mission time is short compared with MTTF 55...

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