roles: - [mon.a, mon.c, mgr.y, mds.a, osd.0, osd.1, osd.2, osd.3] - [mon.b, mgr.x, mds.b, mds.c, osd.4, osd.5, osd.6, osd.7] - [client.0, client.1] openstack: - volumes: # attached to each instance count: 4 size: 30 # GB