roles:-[mon.a,mgr.y,mds.a,mds.c,osd.0,osd.1,osd.2,osd.3,client.0]-[mon.b,mon.c,mgr.x,mds.b,mds.d,osd.4,osd.5,osd.6,osd.7,client.1]openstack:-volumes:# attached to each instancecount:4size:20# GB-machine:disk:200# GBlog-rotate:ceph-mds:10Gceph-osd:10G