ceph status

root@ceph-mon:~# ceph -s
  cluster:
    id:     86f6c84a-3a4d-462c-ad7f-5d2e7f459a7e
    health: HEALTH_WARN
            4 osds down
            Reduced data availability: 212 pgs inactive

  services:
    mon: 1 daemons, quorum ceph-mon (age 5d)
    mgr: ceph-mon(active, since 5d)
    osd: 6 osds: 0 up, 4 in (since 17h)

  data:
    pools:   4 pools, 212 pgs
    objects: 0 objects, 0 B
    usage:   0 B used, 0 B / 0 B avail
    pgs:     100.000% pgs unknown
             212 unknown

root@ceph-mon:~# ceph osd tree
ID CLASS WEIGHT TYPE NAME    STATUS REWEIGHT PRI-AFF
-1            0 root default
 0            0 osd.0          down        0 1.00000
 1            0 osd.1          down        0 1.00000
 2            0 osd.2          down  1.00000 1.00000
 3            0 osd.3          down  1.00000 1.00000
 4            0 osd.4          down  1.00000 1.00000
 5            0 osd.5          down  1.00000 1.00000
root@ceph-mon:~#