I agree with that, but I don’t understand how that’s particularly relevant to a bare metal vs cloud discussion.
Wouldn’t you need to do the work to shard regardless of where you’re running?
Wouldn’t you need to do the work to shard regardless of where you’re running?
The major difference lies in infrastructure, particularly networking infrastructure. With cloud providers like Azure, AWS, etc, you can provision your vnet layout, and scale "indefinitely" on the same infrastructure. You don't need to provision new hosts, setup new secrets, or anything like that.
If a data center goes down, you can relatively easy switch to another one, though most financial institutions I know of uses hot/cold setups as hot/hot is essentially twice the money, and they rarely go down for long.
Of course it's all just regular servers underneath, so anything possible with AWS and Azure is also possible with other cloud providers, but the tooling simply isn't there (yet?).
Another issue is ISO auditor compliance. Being a regulated industry, finance (in EU at least) needs certain compliance to be fulfilled, not only regarding the services you consume, but also stuff like the physical locations, or being able to physically inspect the data center if auditors require it.
Microsoft and Amazon has this nailed. I've yet to experience a EU data center not run by FAANG meet the requirements, not that they can't. My best hope so far is probably "Lidl cloud" (forgot the name).
The compliance issues are another big one though, for organizations that are still scaling up and don’t have that know how using cloud is a huge advantage as well.