Mttr/mttf/mtbf diagram

MTTR/MTTF/MTBF The illustration

MTTR、MTTF、MTBF It is an important index of system reliability , But the three are easily confused , The difference between the three is illustrated below , Hope to play a role in solving doubts .

MTTF (Mean Time To Failure, Mean time between failures ), It refers to the average time of the system running without failure , Take the average of all the time period from the normal operation of the system to the failure . MTTF =∑T1/ N

MTTR (Mean Time To Repair, Mean time to repair ), It refers to the average value of the time period between the system failure and the end of maintenance .MTTR =∑(T2+T3)/ N

MTBF (Mean Time Between Failure, Mean failure interval ), It refers to the average value of the time period between two failures of the system . MTBF =∑(T2+T3+T1)/ N

Obviously :MTBF= MTTF+ MTTR

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