roles:
- [mon.a, mon.b, mon.c, mgr.x, mgr.y, mds.a, mds.b, mds.c, osd.0, osd.1, osd.2, osd.3]
- [client.0]
- [client.1]
openstack:
- volumes: # attached to each instance
count: 4
size: 10 # GB