Ceph storage deploy

Hi guys, I am trying to deploy ceph as datastore I setup ceph

    id:     afdf7077-b549-4aa6-865b-7a9e99da0811
    health: HEALTH_OK
    mon: 3 daemons, quorum cephmon1,cephmon2,cephmon3
    mgr: cephadm(active), standbys: cephosd1
    osd: 3 osds: 3 up, 3 in
    pools:   2 pools, 192 pgs
    objects: 0 objects, 0B
    usage:   324MiB used, 2.33TiB / 2.33TiB avail
    pgs:     192 active+clean

I read opennebula doc ceph in frontend node install ceph-common and client join to ceph cluster
but after finish cephfs not get size what should i do ???