Mean time to repair (MTTR) is the average time required to fix a failed component and/or device and return it to production status. The MTTR can be calculated by dividing the total time required for maintenance by the total number of repairs within a specific timeframe.
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Storage professionals can use MTTR as a performance metric to evaluate whether data storage resources are being used efficiently. MTTR is also an important consideration when negotiating service-level agreement (SLA)s.