(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.
- Mean to
Intend to, as in I meant to go running this morning but got up too late, or I’m sorry I broke it—I didn’t mean to. This idiom was first recorded in 1560.
[meen-tohn] /ˈminˌtoʊn/ noun, Music. 1. a system for tuning keyboard instruments, used before the development of tuning by equal temperament and considered practical only for tonalities of not more than two sharps or flats.
- Mean-tone tuning
noun 1. See temperament (sense 4)
noun, Mathematics. 1. the ratio of the integral of a given function over a closed interval to the length of the interval.