Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
A mission-critical Linux virtual machine (VM) runs an internal line-of-business API for a European customer. The VM (Standard D8s v4, premium SSD) is currently deployed as a single instance in the West Europe region. The solution must meet the following requirements:
Remain fully operational if an entire Azure datacenter inside West Europe becomes unavailable.
Provide a VM connectivity SLA of at least 99.99 percent.
Keep all customer data inside the West Europe region.
Minimize additional licensing and ongoing management overhead.
Which deployment option should you recommend?
Add the VM to an availability set configured with two fault domains and two update domains in the existing datacenter.
Redeploy the workload as a virtual machine scale set with a minimum of two instances distributed across West Europe availability zones and fronted by an Azure Standard Load Balancer.
Move the VM to an Azure Dedicated Host group that spans two fault domains within West Europe.
Enable Azure Site Recovery to replicate the VM to another availability zone in West Europe and configure automatic failover.
The only way to achieve a 99.99 percent virtual-machine connectivity SLA inside a single Azure region is to run at least two VM instances distributed across different availability zones and front them with a standard load-balancer-backed endpoint. A virtual machine scale set with zone distribution automates instance deployment and balancing while avoiding any additional licensing costs and requiring minimal management effort.
An availability set does not protect against a full datacenter (zone) outage and is covered by a 99.95 percent SLA. Azure Site Recovery normally fails over to a different region and requires manual or scripted orchestration, so it does not guarantee the required intra-regional 99.99 percent availability. Deploying the workload on dedicated hosts would add significant cost and still not provide zone redundancy unless combined with additional components, so it also fails to meet the requirements.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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