Azure Multi-Region Disaster Recovery Design
Cloud Architecture
Designing disaster recovery across Azure regions requires more than replication — it demands clear RTO/RPO targets, tested failover runbooks, and governance that holds under pressure. This is the pattern I use for enterprise workloads spanning two or more Azure regions.
Key Patterns & Steps
- Define RTO and RPO per workload tier before touching any Azure service — agree with stakeholders in writing
- Use Azure Site Recovery for IaaS VMs; pair with geo-redundant storage and Traffic Manager for DNS failover
- Zone-redundant deployments within a region first — cross-region failover is expensive and slow; avoid it for minor failures
- Automate failover runbooks in Azure Automation or Azure DevOps pipelines — manual steps fail at 3 AM
- Test failover quarterly on non-production; annual full DR drill including DNS cutover and app smoke tests
- Monitor replication lag with Azure Monitor alerts — lag beyond your RPO window must page on-call immediately
Lessons Learned
The most common failure in DR design is assuming the failover works because it was configured. Replication lag, stale DNS TTLs, and untested application startup sequences kill RTO in real incidents. Build the runbook before you need it.
Technologies
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