[pclmulqdq]

Yeah, that's definitely true. Google sort of mapped an AWS concept onto its own cluster splits. However, there are enough regional-scale outages at all the major clouds that I don't personally place much stock in the idea of zones to begin with. The only way to get close to true 24/7 five-9's uptime with clouds is to be multi-region (and preferably multi-cloud).

[callalex]

I have experienced many outages that were contained to a specific availability zone in AWS, from power failures to flooding to cable cuts. You are correct that 5 9’s still requires multi-region though.