Stress-test a multi-region cutover before DNS plans, data sync windows, and rollback steps harden into what every regional move will quote.
Multi-region cutovers fail when the runbook invents sync speed replication never had, when health checks dual-count the same region as live and as draining, when money paths still lack a named rollback owner, and when ops cannot show who decides after a partial write split. A neat region map is not evidence.
What to put on the table
One sentence for why the cutover exists, which regions and data classes it covers, who owns DNS, replication, and traffic shift, and the rollback trigger if lag or error rates past a named threshold. Attach the region map, sample sync metrics, DNS design, and the measured path from freeze to restored traffic. If platform, SRE, and product disagree on which paths are truly covered, stop and reconcile first.
Name the decision you will make if the stress test finds nothing new, and the delay criteria if any money path still lacks a named cutover owner or a verified drill.
Failure modes worth seating
- DNS fiction: TTLs that look short while resolvers still cache past the drill window.
- Replication blur: lag claims that invent catch-up the secondary never showed.
- Write-split theater: dual-active claims that still lack a conflict owner.
- Runbook lag: steps that trail the customer-visible error rate.
- Partial-region silence: failures that land without a decision owner or measured lag.
Optional security seat if certificate or key cutovers bind the form. Optional support seat if status updates bind the form. Optional finance seat if regional billing cutovers bind the form.
How to run it
Feed Pingpong the draft cutover plan, drill notes, and open risk list. Early passes steelman the design. Later passes attack from SRE, platform, product, support, and skeptic seats. End with a pass that turns surviving objections into clearer owners, a timed regional drill, or a hold. Delete invented "we already cut over cleanly" claims and dual-counted success rates.
Ask SRE and product seats to price the behavior the published cutover will invite. If day-one runbooks promise ten-minute recovery while the last drill stranded checkout for forty, buyers will treat the plan as false. Write the intended regions, the sync checks, and the language you will refuse, then attack whether trust still holds under that discipline.
When the cutover coincides with a residency rule or a CDN change, force eng and support seats to map every claim that still assumes the old region layout. Partner embeds, mobile assets, and admin panels count. A cutover that looks clean in a PDF while a critical write path still pins to one region will fail on the first traffic wave. Related: stress-test a CDN failover, stress-test a migration plan, stress-test a data residency rule, pretend you are the CTO, and the war-game decisions hub. Process: how to run a Pingpong.