5 ms·

It’s hard to measure what five-9 is because you have to wait around until a 0.00001 occurs. Incentivizing post-mortems are absolutely critical in this case.

• notinty 5y ago
  It's 0.001; the first 2 9's count. 5N = 99.999% 3N = 99.9% 1N5 = 95% 5N is <43m12s downtime per month.
  • 1-6 5y ago
    I considered writing it as a percent but then decided against using it and moving the decimal instead. But good info for clarification.