What does happen in Azure is Service disruption. Sometimes those are due to some hardware failures, but most of the time, they are a software problem: an upgrade in Azure software (Microsoft’s software) gone wrong. They happen occasionally, are typically short lived but if business continuity is a hard requirement, those are the ones you should protect your solution against.
In this article I’ll cover resilience for virtual machines. I’ll assume that you are usingAzure Traffic Manager or other DNS service to fail over the traffic from a primary to a secondary region.
He covers “stateless” VMs (like web servers or app servers) as well as “stateful” VMs (like database servers) and explains disaster recovery options for each.