A cloud architect is establishing a standard operating procedure for validating disaster recovery (DR) failover from a primary GCP region (us-central1) to a secondary region (us-east4) for an enterprise application. In what sequence should the architect execute the following steps to perform a safe and successful DR failover test?
- 1Verify and confirm that sufficient Compute Engine resource quotas and IP allocations are available in the target DR region (us-east4).
- 2Validate replication synchronization status and promote the secondary database replica in us-east4 to primary read-write status.
- 3Update Cloud DNS routing policies and Cloud Load Balancing backends to direct production traffic to the us-east4 environment.
- 4Execute automated synthetic end-to-end integration tests and monitor SLIs to validate RTO/RPO objectives and system health.
Answer
The correct operational sequence for DR failover validation is: 1) Verify quota availability in the secondary region, 2) Validate data replication and promote the secondary database replica, 3) Reconfigure load balancing and DNS to route traffic to the secondary region, and 4) Run synthetic end-to-end integration tests to confirm operational readiness.
The proper disaster recovery validation sequence follows a dependency-driven path: first, pre-flight capacity and quota checks ensure the target environment can host the workload. Next, data integrity is verified and storage replicas are promoted to primary read-write status. Once the application backend and database are fully operational, network load balancing and DNS routing are updated to shift live traffic. Finally, synthetic end-to-end tests validate system health and compliance with RTO/RPO objectives.
Step-by-Step Solution
Key Concept
Disaster Recovery Validation Procedures and Operational Execution Order