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The point is that at eleven nines, you're entering the realm of very rare/unlikely events that will also affect durability.

In other words, there's a lack of humility about "unknown unknowns".

but amazon doesn't offer eleven 9s of availability. I don't think anybody serious does, so arguing how silly eleven 9s of availability is is kind of pointless. The SLA is only four 9s of availability.

Not even four 9's - they only trigger SLA credits when they dip below 3 9's.

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