Architecture & practice·Incidents and what happens after
you broke the database on purpose during working hours to find out whether the failover worked.
Game day
Also calleddisaster recovery exercise, failover drill, fire drill
A scheduled exercise where a failure is deliberately induced to test the system and the people around it. Its main product is usually not the technical finding but the procedural one: the runbook was wrong, the alert went to a former employee, nobody knew who could authorise the failover. Running one is the only reliable way to find latent failures before they find you.