Comment 2 for bug 1931003

Cinder deals with a lot more small IO requests than Glance, so doubling the chunk size might not be ideal. Would conversion of volumes be required in an upgrade scenario? #2 seems like the more compatible approach given that Kolla-Ansible doesn't manage Ceph these days, and users are going to bring all sorts of Ceph backends into the mix on their own (we're using Canonical's for instance).