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Computing (FOLDOC) dictionary
Mean Time To Recovery
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specification (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.