Ecification> (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, sEEEf="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=RAID">RAID for ExamplE. SEE also Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=MEan TimE BEtwEEn FailurEs">MEan TimE BEtwEEn FailurEs. (1998-05-01)