[OSA] Failover at the storage level

Good morning everybody! I'm trying to raise a scenario with redundancy at the storage level. I'm using CEPH with RBD-mirror. Cinder has a pretty clear documentation about it, but I didn't find anything about Glance and the "nova_libvirt_images_rbd_pool" and the "cinder_service_backup_driver". What would be the best approach? Only use Cinder with Mirror? If by chance the "nova_libvirt_images_rbd_pool" dies, if you are using config-drive the disk will die, correct? In this case, would it be better to leave local? I can't see what would be the best scenario for Failover cases with OSA. Thanks in advance!