roles: - [mon.a, mgr.y, mds.a, osd.0, osd.1, osd.2, osd.3, client.0] - [mon.b, mon.c, mgr.x, mds.a-s, osd.4, osd.5, osd.6, osd.7] openstack: - volumes: # attached to each instance count: 4 size: 10 # GB log-rotate: ceph-mds: 10G ceph-osd: 10G