Comment 3 for bug 1768231

Here is an log snippet when you try to use the "down" backend

infra3-cinder-api-container-e36ebc84 cinder-scheduler: 2018-04-30 11:07:10.592 3120 ERROR cinder.scheduler.flows.create_volume [req-fa3478fd-5ce5-4253-8fbb-7d8fb8353718 db1b61a8da364c85b793123d956f42aa f48410de667a4e5b92ce50e1b9de27f1 - - -] Failed to run task cinder.scheduler.flows.create_volume.ScheduleCreateVolumeTask;volume:create: No valid backend was found. No weighed backends available: NoValidBackend: No valid backend was found. No weighed backends available