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- Availability 可用性
- Reliability 可靠性
MTBF(Mean Time Between Failure),即平均无故障时间
MTTR(Mean Time To Repair),即平均修复时间
MTTF(Mean Time To Failure),即平均失效时间
Availability = UpTime/(UpTime+DownTime) = MTBF / (MTBF + MTTR)- Stability 稳定性