Introduction to Software Quality by Gerard O’Regan
Author:Gerard O’Regan
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham
where the mean time between failure (MTBF) is the average length of time between outages.
The formula for MTBF above is for a single system only, and the formula is adjusted when there are multiple systems.
The mean time to repair (MTTR) is the average length of time that it takes to correct the outage, i.e., the average duration of the outages that have occurred, and it is calculated from the following formula:
Figure 10.24 presents outage information on the customers impacted by the outage during the particular month, and the extent of the impact on the customer.
Fig. 10.24Outage time per customer
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