Ceph cluster

   $ ceph -s

   $ ceph health

   $ ceph -w

   $ ceph osd stat

   $ ceph mon stat

   $ ceph mds stat

   $ ceph pg dump

   $ ceph pg dump_stuck

   $ ceph quorum_status

   $ ceph mon getmap -o <path>

   $ monmaptool --print <monmap_path>