Mika Sutinen explains some of the nuance around Azure availability zones:
Azure Availability Zones help provide resiliency to your database services within an Azure Region. I simply love it how simple Microsoft has made building geographically dispersed database services. If you’ve ever designed and deployed multi-site, highly available database services in on-premises, you know what I am talking about.However, with the Availability Zones in Azure, there are a couple of things to know. I’ve learned my lessons the hard way, so in this post I am providing some tools and guidance on how to avoid some pitfalls when building multi-zone database services.
Click through for that guidance.