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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
Mean Time To Recovery
MTTR
(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.
(1998-05-01)