Reliability Engineering

Overview Your company uses a cloud service with an SLA that clearly states 99.95% monthly availability. One night, the service goes down for 30 minutes. You file a compensation claim with the cloud provider. The calculation goes roughly: downtime as a fraction of total monthly minutes, multiplied by your monthly fee. Assuming you pay 1000 yuan/month, that’s 30 minutes divided by 43,200 minutes times 1000, giving you about 0.7 yuan....

Reliability Engineering: More Than Just “Not Breaking” The goal of reliability engineering is not to pursue zero failures — that’s neither realistic nor economical. The real goal is: given that failures are inevitable, make the system capable of fast detection, automatic recovery, and continuous learning. Google SRE proposes a core formula: MTTR << MTBF / (MTBF + MTTR) × (1 - SLO) This formula reveals a key insight: when the time between failures (MTBF) is much greater than the repair time (MTTR), system availability naturally approaches the SLO target....