meta:
- desc: |
   3-node cluster
   install and run ceph-ansible on a mon.a node alone with ceph 
roles:
- [mon.a, mds.a, osd.0, osd.1, osd.2]
- [mon.b, mgr.x, osd.3, osd.4, osd.5]
- [mon.c, mgr.y, osd.6, osd.7, osd.8, client.0]
openstack:
- volumes: # attached to each instance
    count: 3
    size: 10 # GB