Comment on Going Multi-Cloud with AWS and GCP: Lessons Learned at ScaleparentComments−outworlder9yHaving a software defined networking spanning across regions and failure cascades across regions are two different things. There's nothing preventing a vendor from presenting to you a single network, while they are actually distinct networks.−hossbeast9yHaving distinct networks in different regions encourages you to architect your application in a fault tolerant way.−kakwa_9yOr the contrary. In most cases there is something to synchronize between regions, like a replica of the data.With difficult interconnection of regions, it makes it somewhat harder to do, and it can easily end-up with "meh, AZs are good enough".
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Having a software defined networking spanning across regions and failure cascades across regions are two different things. There's nothing preventing a vendor from presenting to you a single network, while they are actually distinct networks.
Having distinct networks in different regions encourages you to architect your application in a fault tolerant way.
Or the contrary. In most cases there is something to synchronize between regions, like a replica of the data.
With difficult interconnection of regions, it makes it somewhat harder to do, and it can easily end-up with "meh, AZs are good enough".