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A company is deploying a critical, multi-tier application in an Azure region that supports Availability Zones.
The application requires maximum resilience against infrastructure failures, including individual hardware component failures within a datacenter and complete datacenter outages within the region. Additionally, the company needs to ensure that planned Azure maintenance activities do not cause a full application downtime.
Which Azure high availability strategy should be implemented for the application's virtual machines to meet these comprehensive requirements?
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To achieve the highest level of resilience within a single Azure region, deploying virtual machines across multiple Availability Zones is the best approach. Availability Zones are like separate buildings or sections within an Azure region, each with its own power, cooling, and network. If one of these zones experiences a complete outage, your application can continue running in the other zones. This setup also automatically handles the distribution of your VMs across different physical hardware (fault domains) and ensures that planned maintenance affects only one part of your application at a time (update domains), preventing full downtime.
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