A migration playbook for VPs of Infrastructure responsible for resilience and regulatory geography - what to keep single-region, what to make active-passive, and what to put on active-active without paying for the whole platform twice.
Map every workload. Identify which need active-active multi-region (real-time customer-facing, regulatory-impactful), which need active-passive (operational analytics with longer RTO), and which are fine single-region (internal tooling, exploration).
Active-active requires multi-region data. The data strategy is the most consequential decision - replication topology, conflict resolution, regional shards for data residency, and the read/write split that survives a region event.
Migration runs incrementally. New workloads launch multi-region by default. Failover is tested on a schedule on real workloads, not theorized in a runbook.
Map every workload. Identify which need active-active multi-region (real-time customer-facing, regulatory-impactful), which need active-passive (operational analytics with longer RTO), and which are fine single-region (internal tooling, exploration).
Active-active requires multi-region data. The data strategy is the most consequential decision.
Migration runs incrementally. New workloads launch multi-region by default. Failover is tested before it is needed.
Move workloads in the order that retires the most risk per week. Implement regional sharding where data residency requires it. Establish the failover-drill cadence the platform will run forever.
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