Question

A retail company runs a stateless web API on an Azure Virtual Machine Scale Set behind a Standard Load Balancer in the East US region. Business requirements now mandate that the API remain available even if the entire East US region becomes unavailable, with an RTO of 15 minutes and automatic traffic redirection. The application stores no session state locally. Which solution should you recommend?

Accepted Answer

Deploy an identical scale set in a second region behind its own regional load balancer, then place Azure Front Door in front of both regions with health-probe-based failover.

Answer

Reconfigure the existing scale set to span multiple availability zones within East US and enable zone-redundant Standard Load Balancer.

Answer

Enable Azure Site Recovery replication of each scale set instance to a second region and script a recovery plan that fails over the VMs on demand.

Answer

Increase the scale set instance count and configure an autoscale rule that adds instances when regional latency rises.