I need to deploy cinder and glance with multi-backend.

My experience for now is simple, my deployment is an HCI built on top of ceph storage, and I am using it to store both cinder volumes and glance images.

I have some questions if you can help:

- can multi-backend be deployed at first run with kolla-ansible, or do I need to do at least two runs?

- reading the doc about multi-backend, I saw that the first backend is specified, do I need to remove the creation of the first backend from glabals.yml and put it in a configuration file cinder.conf and glance.conf?

In other words, do I have to create all the backends from the config files, or can I still create the first one using globals.yml and the rest from the config files?

I hope my question is clear.