roles: - [mon.0, mds.a, osd.0] - [mon.1, osd.1] - [mon.2, osd.2] - [osd.3] - [osd.4] - [osd.5] - [osd.6] - [osd.7] - [osd.8] - [osd.9] - [osd.10] - [osd.11] - [osd.12] - [osd.13] - [osd.14] - [osd.15] - [client.0]