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Eh, 99.99 is less than an hour downtime a year. I know of almost nothing of any size that actually achieved that save certain areas of the power grid.


That does depend somewhat on what you count as "downtime". Larger distributed systems may not suffer a complete outage in the whole year, and more than one of the services my team runs has that level of successful response ratio.


As a person who runs an OpenStack cluster, I can pull 100% uptime many months back to back with minimum intervention.




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