roles: 
- [mon.a, mgr.y, osd.0, osd.4, osd.8, osd.12]
- [mon.b, osd.1, osd.5, osd.9, osd.13] 
- [mon.c, osd.2, osd.6, osd.10, osd.14] 
- [mgr.x, osd.3, osd.7, osd.11, osd.15, client.0]
overrides:
  ceph:
    conf:
      osd:
        osd shutdown pgref assert: true