Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
Your company runs a mission-critical web application on four Windows Server 2019 virtual machines in an availability set in the East US region. Leadership mandates that if East US is unavailable, the service must be restored in West US within two hours and with no more than 15 minutes of data loss. The solution must retain the VMs' private IP addresses after failover and avoid manual DNS record changes. You need to design a disaster recovery strategy with minimal operational effort. Which approach should you recommend?
Deploy the VMs in an availability zone-redundant virtual machine scale set that spans East US and West US regions.
Use Azure Site Recovery to replicate the VMs to West US, enable private IP address retention, and configure an Azure Traffic Manager profile with endpoints in both regions for automatic failover.
Enable geo-redundant storage for the VMs' managed disks and plan to restore the VMs from Azure Backup to West US during a disaster.
Schedule Azure Automation runbooks to export VHDs to a West US storage account and redeploy the VMs from these VHDs if East US fails.
Azure Site Recovery (ASR) supports Azure-to-Azure replication of virtual machines to a paired region and offers application-consistent recovery points with an RPO as low as minutes and typical RTO of less than two hours. ASR allows you to enable the "retain IP" setting so that each replica keeps its original private IP address when it starts in the target virtual network. By pre-configuring an Azure Traffic Manager profile with endpoints in both regions, traffic automatically redirects to the recovered service, eliminating manual DNS edits.
Using only geo-redundant storage and restoring from Azure Backup would exceed the two-hour RTO and would not preserve IP addresses. Availability zones cannot span different regions, so they do not provide regional disaster recovery. Manually exporting VHDs and redeploying VMs requires significant operator intervention and would not meet the RTO/RPO targets.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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