roles:-[mon.a,mgr.y,mds.a,mds.b,osd.0,osd.1,osd.2,osd.3]-[mon.b,mon.c,mgr.x,mds.c,osd.4,osd.5,osd.6,osd.7]-[client.0]-[client.1]-[client.2]-[client.3]openstack:-volumes:# attached to each instancecount:4size:30# GB-machine:disk:200# GBlog-rotate:ceph-mds:10Gceph-osd:10G