The bandwidth billing challenge When deploying infrastructure across multiple AWS availability zones (AZs), bandwidth costs can become a significant operational expense. Some of our Upsun infrastructure spans three AZs for high availability, but this architecture created an unexpected challenge with our Ceph-based storage system.Since Ceph distributes data across the cluster and AWS bills for inter-AZ traffic, approximately two-thirds of our disk I/O traffic crossed AZ boundaries—generating subs...