Migration Cutover Rehearsals: Why the Dress Rehearsal Is the Real Migration Plan
Most migration cutovers fail on timing, not technology. The runbook says six hours, the window is eight, and nobody has measured either. Here is how technical program leaders use full-volume cutover rehearsals, go/no-go gates, and rehearsed rollback to turn a hopeful plan into a measured one.
The cutover runbook is the most confidently wrong document in any migration program. It is reviewed, versioned, color coded, and signed off by every workstream lead, and it almost never contains a single number that anyone has actually measured. A runbook that has not been rehearsed at full volume is not a plan. It is a hypothesis with a timestamp.
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