Answer: Mean Time Between Failures (MTBF) and Mean Time To Repair (MTTR) play a pivotal role in shaping the accessibility of an application service.
MTBF assesses the typical time pause between two back-to-back instances of failure or incidents. It offers valuable insights into the reliable nature of the service by quantifying how frequently failures occur. Higher MTBF values indicate stronger reliability, pointing towards longer spans free from troubles. You can calculate MTBF using this formula: MTBF = Uptime / Number of Incidents.
In contrast, MTTR gauges the average time consumed to fully restore the service following a crash or incident happening. It sheds light on the effectiveness exhibited by your incident response and resolution procedures. Lesser MTTR values manifest faster recovery periods, which in turn raise availability levels. You can calculate MTTR employing this formula: MTTR = Downtime / Number of Incidents.
Collectively as a duo, these metrics stand to determine whether an application service is readily accessible or not.
By examining our SRE best practices guide you can get a handle on why Mean Time Between Failures and Mean Time To Repair impact how available application services are.