Yes. It started as a failure in one region, and propagated to others as it overloaded the "control plane" -- the stuff that runs "the cloud", and EBS tried to replicate "failed" disks to the point that Amazon ran out of disk space in the cluster. At the time, I was paying for RDS Multi-AZ which runs your database in multiple availability zones at once with hot failover if the primary goes offline. It failed to fail over despite that. Many large sites went down for a very long time that day, and people couldn't spawn replacement instances even in other AZs than the one the failure started in.
