1. [root@ceph-mon1 ~]# ceph -s
       cluster 03f3afd4-4cc6-4083-a34c-845446a59cd4
        health HEALTH_OK
        monmap e1: 1 mons at {ceph-mon1=10.10.64.20:6789/0}
               election epoch 4, quorum 0 ceph-mon1
        osdmap e206: 4 osds: 4 up, 4 in
               flags sortbitwise
         pgmap v5412: 64 pgs, 1 pools, 9829 MB data, 4843 objects
               37747 MB used, 163 GB / 199 GB avail
                     64 active+clean
   [root@ceph-mon1 ~]#

MCE