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