Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
You manage 20 Windows Server 2019 Azure virtual machines that host a critical manufacturing application in the East US region. The organization requires: an RPO of no more than five minutes during a regional outage, an RTO of one hour, the ability to perform non-disruptive disaster-recovery drills, and minimal compute cost in the secondary region while the application is healthy. Which Azure solution should you implement?
Convert the virtual machines' managed disks to zone-redundant storage and rely on automatic zone failover.
Deploy an identical VM scale set in West US and direct traffic with Azure Traffic Manager for active/passive failover.
Enable Azure Site Recovery to replicate the virtual machines asynchronously to a paired region and configure planned and test failovers.
Back up the virtual machines to a Recovery Services vault that uses geo-redundant storage and enable cross-region restore.
Azure Site Recovery (ASR) is designed specifically for disaster-recovery scenarios. For Azure VMs it provides asynchronous replication with typical recovery point objectives under five minutes and orchestrated failovers that can bring workloads online in well under an hour, meeting both the RPO and RTO requirements. ASR also supports test failovers that run in an isolated network, allowing regular disaster-recovery drills without affecting production. Because target resources such as VMs and IP addresses are created only at failover or during a test, ongoing compute costs in the secondary region are minimal-storage charges apply, but no virtual machine runtime costs accrue until failover.
Geo-redundant backups with cross-region restore are aimed at long-term data protection; their RPO is at best the backup frequency (typically hours or days) and restore times are longer, so they cannot satisfy the required five-minute RPO. Zone-redundant managed disks protect against zone failures inside a single region, not a full regional outage. Maintaining a warm standby VM scale set in another region could meet RPO/RTO targets, but the standby VMs would incur continuous compute charges and DR drills would impact production instances, violating the cost and non-disruptive-test requirements.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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