Slides - Åbo Akademi
Slides - Åbo Akademi
Slides - Åbo Akademi
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Reliability Parameters<br />
MTTF: Mean Time to Failure, i.e., the expected time that a system will<br />
operate before the first failure occurs (often term MTBF – Mean Time<br />
Between Failures – is used for repairable systems)<br />
MTTR: Mean Time to Repair, i.e., the average time taken to repair a<br />
system that has failed<br />
MTTR includes the time taken to detect the failure, locate the fault,<br />
repair and reconfigure the system.<br />
MTTF =<br />
∫ ∞<br />
0<br />
R(t)dt MTTR =<br />
∫ ∞<br />
0<br />
(1 − M(t))dt<br />
Availability of a repairable systems is defined as<br />
MTTF<br />
MTTF + MTTR
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