Check cluster status,
ceph health ceph status ceph -s ceph -w
Stop/Start or restart the whole thing,
#systemctl stop ceph.target #systemctl start ceph.target #systemctl restart ceph.target
Overwrite the configurations,
ceph-deploy --overwrite-conf config push ceph1 ceph2 ceph3
To add a monitor: http://docs.ceph.com/docs/kraken/rados/operations/add-or-rm-mons/
Review the disk/osd tree,
ceph osd tree
Check the OSD usage!
ceph osd stat
Bring an OSD down and purge it,
ceph osd out 0 ceph -w ssh ceph3 ls -1 /var/run/ceph ssh ceph3 systemctl stop ceph-osd@0 ceph osd purge 0 --yes-i-really-mean-it
Check the Metadata services,
ceph mds stat