Comment 0 for bug 1491478

If you follow the documentation, you'll define in openstack_user_config.yml the "cinder_default_availability_zone" and cinder_storage_availability_zone.

If you have your storage-infra hosts (where is your cinder scheduler) on the same hosts as your storage hosts, you'll be able to create your volume with horizon with the option to create a volume in "Any availability zone".

However, when storage-infra hosts and storage hosts are different, the formers don't get the "cinder_*_availability_zone" variables. Therefore, when horizon will try to create in "any availability zone", it will try to create with the default, which is unset (and defaults to nova). The volume creation then fails.