roles:
- [mon.a, mgr.x, mds.a, mds.a-s]
- [mon.b, mgr.y, mds.b, mds.b-s]
- [mon.c, mgr.z, mds.c, mds.c-s]
- [osd.0]
- [osd.1]
- [osd.2]
- [client.0]