Multi-Site Active-Active DR
Active-active is the gold standard of disaster recovery — your application serves traffic from multiple regions simultaneously. When one region fails, the other absorbs the load seamlessly. No failover delay, no data loss, no customer impact. We implement multi-site architectures for applications that cannot tolerate any downtime.
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Traffic Routing and Load Balancing
Global traffic routing uses latency-based or geolocation DNS (Route 53, Cloudflare) to direct users to the nearest healthy region. Health checks monitor each region's endpoints and automatically remove unhealthy regions from the routing pool. CDN layers (CloudFront, Cloudflare) cache static assets at edge locations. During a region failure, DNS TTLs ensure traffic shifts to the surviving region within seconds to minutes.
Data Replication and Consistency
Multi-site architectures face the hardest distributed systems problem: data consistency across regions. We implement the right consistency model for each data type. User sessions use eventually-consistent replication (Redis with cross-region sync). Financial transactions use synchronous replication or single-region write leader with async read replicas. CRDTs or event sourcing handle conflict resolution for concurrent writes. Aurora Global Database or CockroachDB provide multi-region SQL with configurable consistency.
Stateless Application Deployment
Applications must be stateless and region-aware. Session state lives in distributed cache, not local memory. File uploads go to S3 with cross-region replication, not local disk. Background jobs use distributed queues (SQS, Kafka) with consumer groups per region. We refactor application code where needed and deploy identical application versions to all regions via GitOps pipelines that target multiple Kubernetes clusters simultaneously.
Cost and Complexity Analysis
Active-active doubles (or triples) your infrastructure cost. It is justified when: downtime costs exceed $10K/minute, SLAs require 99.99%+ availability, or regulatory requirements mandate geographic redundancy. We model the cost: compute, database, storage, and cross-region data transfer. For most startups, warm standby with 15-minute RTO costs 80% less than active-active. We recommend the pattern that matches your actual availability requirements — not the most impressive architecture diagram.
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