meaning of mean time between faults

1. Mean Time Between Faults Mean Time Between Failures Mean Time To Recovery MTTR The average time that a device will take to recover from a non-terminal failure. Examples of such devices range from self-resetting fuses where the MTTR would be very short, probably seconds, up to whole systems which have to be replaced. The MTTR would usually be part of a maintenance contract, where the user would pay more for a system whose MTTR was 24 hours, than for one of, say, 7 days. This means the supplier is guaranteeing to have the system up and running again within 24 hours or 7 days of being notified of the failure. Some devices have a MTTR of zero, which means that they have redundant components which can take over the instant the primary one fails, see RAID for example. See also Mean Time Between Failures.


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