A multinational corporation uses Azure Virtual Machines to host its critical ERP system. The system requires near-zero downtime and minimal data loss in case of a regional outage. The company has a Recovery Point Objective (RPO) of 5 minutes and a Recovery Time Objective (RTO) of 15 minutes. The solution must support automatic failover and failback between Azure regions. Additionally, the disaster recovery solution needs to be tested periodically without impacting the production environment. Which Azure service is BEST suited to meet these requirements for disaster recovery?
- AAzure Site Recovery (ASR)
- BAzure Blob Storage Geo-Redundant Storage (GRS)
- CAzure Traffic Manager
- DAzure Backup for Azure VMs
Show answer & explanationAnswer & explanation
Correct answer: A. Azure Site Recovery (ASR)
Azure Site Recovery (ASR) is the ideal solution. It provides continuous replication of Azure VMs between regions, enabling low RPO (5 minutes) and RTO (15 minutes). ASR supports orchestrated failover and failback, crucial for complex ERP systems. Critically, ASR allows for non-disruptive disaster recovery drills, where a test failover can be performed in an isolated network without affecting the running production environment, directly addressing the requirement for periodic testing without impact.
Why the other options are wrong
- B. GRS provides data redundancy for storage accounts but does not provide VM replication, automatic failover for compute, or testing capabilities.
- C. Azure Traffic Manager is a DNS-based traffic load balancer, not a disaster recovery solution for VM replication, failover, or testing.
- D. Azure Backup is for data protection and long-term retention, not for active-active disaster recovery with low RTO/RPO or non-disruptive testing.
Azure Site Recovery (ASR) Test Failover
A critical feature of Azure Site Recovery that allows for non-disruptive disaster recovery drills by creating isolated copies of replicated VMs in a test network.
- Enables validation of recovery plans without impacting production.
- Creates a copy of replicated VMs in an isolated network.
- Essential for meeting compliance and RTO objectives.
- Helps identify and resolve potential issues in the DR plan.
Memory trick: ASR is your DR rehearsal stage, testing recovery without breaking the show.