Uptime has nothing to do with anything in the real world. It's a number you put in an SLA of how much downtime is acceptable before they start paying you back m

Uptime has nothing to do with anything in the real world. It's a number you put in an SLA of how much downtime is acceptable before they start paying you back money. And 99.9% still means 43 minutes of downtime every month. And even after that it's a calculation of risk. What does full redundancy cost vs paying back the fees for a say 24 hours of downtime? A lot of the time paying back money is way way cheaper then actually investing in technical redundancy.