MTBF (Mean time between failure) refers to the average amount of time that a device or product functions before failing. It is a measure of how reliable a hardware product or component is. In General, the measure is typically in thousands or even tens of thousands of hours between failures.MTBF is an indication of product reliability and robustness to be available without any hardware faults. It also helps customers an indication of how much service to plan for. Below is the computation formula of MTBF –
MTBF = 1/(FR1+FR2+FR3+••••• +FRn)
Where FR is the failure of the each component of the system.
To calculate the Overall MTBF, failure rate of all the individual components used to make the system is taken into calculation. Operating and storage temperature need to be considered for calculation.
MTBF is key component in network availability calculation. Below is the availability calculation formula –
MTTR (Mean time to repair) (MTTR) is the average time required to troubleshoot and repair failed equipment and return it to normal operating conditions.It represents the average time required to repair a failed component or device It is a basic technical measure of the maintainability of equipment and repairable parts. It generally does not include lead time for parts not readily available.
MTTR = Total maintenenace time / no. of repairs
MTTR is another key component in network availability calculation. Below is the availability calculation formula –