Mean Time To Repair

Reliability engineering - Reliability prediction and improvement 1 Reliability prediction is the combination of the creation of a proper reliability model together with estimating (and justifying) the input parameters for this model (like failure rates for a particular failure mode or event and the mean time to repair the system for a particular failure) and finally to provide a system (or part) level estimate for the output reliability parameters (system availability or a particular functional failure frequency).

Availability - Definitions within Systems Engineering 1 Inherent availability is generally derived from analysis of an engineering design and is calculated as the mean time to failure (MTTF) divided by the mean time to failure plus the mean time to repair (MTTR)

Availability - Example 1 If we are using equipment which has a mean time to failure (MTTF) of 81.5 years and mean time to repair (MTTR) of 1 hour:

Service-level agreement 1 In this case the SLA will typically have a technical definition in terms of mean time between failures (MTBF), mean time to repair or mean time to recovery (MTTR); various data rates; throughput; jitter; or similar measurable details.

Support automation 1 Automation of service organizations aim to achieve, for example, lower mean time to repair (MTTR).

Decision engineering - Bringing numerical methods to the desktop 1 As an example, one link might represent the connection between mean time to repair a problem with telephone service and customer satisfaction, where a short repair time would presumably raise customer satisfaction

Service-level agreement 1 In this case the SLA will typically have a technical definition in terms of MTBF|mean time between failures (MTBF), mean time to repair or mean time to recovery (MTTR); various data rates; throughput; jitter; or similar measurable details.

Fault-tolerant system - Examples 1 Hardware fault-tolerance sometimes requires that broken parts can be taken out and replaced with new parts while the system is still operational (in computing known as hot swapping). Such a system implemented with a single backup is known as 'single point tolerant', and represents the vast majority of fault-tolerant systems. In such systems the mean time between failures should be long enough for the operators to have time to fix the broken devices (mean time to repair)

Logistic engineering 1 Logistics engineers work with complex mathematical models that consider elements such as mean time between failures (MTBF), mean time to failure (MTTF), mean time to repair (MTTR), failure mode and effects analysis (FMEA), statistical distributions, queueing theory, and a host of other considerations

Monte Carlo method - Engineering 1 * In reliability engineering, one can use Monte Carlo simulation to generate mean time between failures and mean time to repair for components.

FCAPS - Background 1 The comprehensive management of an organization's information technology (IT) infrastructure is a fundamental requirement. Employees and customers rely on IT services where availability and performance are mandated, and problems can be quickly identified and resolved. Mean time to repair (MTTR) must be as short as possible to avoid system downtimes where a loss of revenue or lives is possible.

Maintenance philosophy - Military Versus Commercial 1 As an example, if a system is built from 1,000 individual computers each with a 3 year Mean Time Between Failure (MTBF), then the whole system will have an MTBF of 1 day. If Mean Time To Repair (MTTR) is 3 days, then the system will never work.

Mean time between failure 1 The MTBF is typically part of a model that assumes the failed system is immediately repaired (mean time to repair, or MTTR), as a part of a renewal process

Mean time to recovery 1 'Mean time to recovery' ('MTTR')[ a_term/0,2542,t=mean+time+to+repairi=4741 8,00.asp Also refer to Mean Time To Repair or Mean Time To Restore][ftp://download.intel.com/design/serv ers/ISM/docs/ pdf INTEL call for Mean-Time-to-Repair on page 4 left.] is the arithmetic mean|average time that a device will take to recover from any failure

SA Forum - Description 1 * Minimization of mean time to repair (MTTR) – time to restore service after an outage

MTTR 1 In an engineering context with no explicit definition, the engineering figure of merit, mean time to repair would be the most probable intent by virtue of seniority of usage. It is also similar in meaning to the others above (more in the case of recovery, less in the case of respond, the latter being more properly styled mean Response time (technology)|response time).

PICMG This allows a much lower Mean time to repair|Mean Time to Repair than classic computer motherboard approaches, as electronics associated with CPUs can be replaced without having to remove peripheral devices.

Run Book Automation - Runbook Automation 1 According to Gartner, the growth of RBA has coincided with the need for IT operations executives to enhance IT operations efficiency measures—including reducing mean time to repair (MTTR), increasing mean time between failures (MTBF), and automating provisioning of Information technology|IT resources

Unavailability 1 where MTTR is the mean time to repair, and MTTF is the mean time to failure. Alternatively, this can be written as

Mean time to repair 1 It represents the arithmetic mean|average time required to repair a failed component or device.[ ean-time-to-repair-MTTR.html BusinessDictionary.com, Mean Time To Repair definition] Expressed mathematically, it is the total corrective maintenance time divided by the total number of corrective maintenance actions during a given period of time.[ mean_time_to_repair.html Institute for Telecommunications Sciences, Mean Time To Repair definition] It generally does not include lead time for parts not readily available or other Administrative or Logistic Downtime (ALDT).

Mean time to repair 1 For example, a system with a service contract guaranteeing a mean time to REPAIR of 24 hours, but with additional part lead times, administrative delays, and technician transportation delays adding up to a mean of 6 days, would not be any more attractive than another system with a service contract guaranteeing a mean time to RECOVERY of 7 days.

Mean down time 1 In organizational management, 'mean down time' ('MDT') is the average time that a system is non-operational. This includes all downtime associated with repair, Corrective maintenance|corrective and preventive maintenance, self-imposed downtime, and any logistics or Administration (business)|administrative delays. The inclusion of delay times distinguishes mean down time from mean time to repair (MTTR), which includes only downtime specifically attributable to repairs.

Fault tolerant system - Examples 1 In such systems the mean time between failures should be long enough for the operators to have time to fix the broken devices (mean time to repair) before the backup also fails

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