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Mean time to repair (MTTR) is a basic measure of the maintainability of repairable items. It represents the average time required to repair a failed component or device. [ 1 ] Expressed mathematically, it is the total corrective maintenance time for failures divided by the total number of corrective maintenance actions for failures during a ...
Mean time to recovery (MTTR) [1] [2] [3] is the average time that a device will take to recover from any failure. Examples of such devices range from self-resetting fuses (where the MTTR would be very short, probably seconds), to whole systems which have to be repaired or replaced.
Greenwich Mean Time, the mean solar time at the Royal Observatory, Greenwich in England: often used to refer to Coordinated Universal Time; Local mean time, a form of solar time that corrects the variations of local apparent time; Washington Mean Time, the time at the meridian through the center of the old dome atop the main building at the old ...
In such systems the mean time between failures should be long enough for the operators to have sufficient time to fix the broken devices (mean time to repair) before the backup also fails. It is helpful if the time between failures is as long as possible, but this is not specifically required in a fault-tolerant system.
A concept which is closely related to MTBF, and is important in the computations involving MTBF, is the mean down time (MDT). MDT can be defined as mean time which the system is down after the failure. Usually, MDT is considered different from MTTR (Mean Time To Repair); in particular, MDT usually includes organizational and logistical factors ...
Availability is typically given as a percentage of the time a system is expected to be available, e.g., 99.999 percent ("five nines"). Serviceability or maintainability is the simplicity and speed with which a system can be repaired or maintained; if the time to repair a failed system increases, then availability will decrease. Serviceability ...
The inclusion of delay times distinguishes mean down time from mean time to repair (MTTR), which includes only downtime specifically attributable to repairs. [1] Mean Down Time key factors: SYSTEM FAILURE. Identification & Recovery Time. First, the fact that the system is down must be identified, and maintainers notified & brought to action
Mean time to repair; Mean time to recovery or mean time to restore This page was last edited on 7 ...