Multi-Region Active-Active Readiness Checklist

Most multi-region setups are active-passive in disguise. The 10 capabilities required for true active-active.

Data layer

Multi-region writeable database. CRDB, Spanner, DynamoDB Global Tables.

Conflict resolution strategy. Last-write-wins, CRDTs, application logic.

Traffic layer

Geo-aware DNS routing. Health checks per region.

Failover criteria documented. What triggers traffic shift.

Test it

Quarterly: drain one region. Traffic should redistribute without alarm.

Without testing, multi-region is theatre.