[notquitehuman]

It’s Twitter. A nine is more than enough for their most critical workloads.

[8organicbits]

One nine allows 10% downtime. That's 36 days per year. I doubt that.

[klawed]

Wouldn’t 1 nine be 9%?

[8organicbits]

One nine is atleast 90.0%.

Two nines is atleast 99.0%.

Three nines is atleast 99.9%.

and so on.