roles:
- [mon.a, mon.c, osd.0, osd.1, osd.2]
- [mon.b, mgr.x, mds.a, osd.3, osd.4, osd.5]
- [client.0]
- [client.1]
openstack:
- volumes: # attached to each instance
    count: 3
    size: 10 # GB
overrides:
  ceph:
    conf:
      osd:
        osd shutdown pgref assert: true