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Operating Ceph

Check cluster status,

ceph -s
#ceph health
#ceph status

Check the cluster logs in real time,

ceph -w

Stop/Start or restart the whole thing on a node or admin,

#systemctl stop ceph.target
#systemctl start ceph.target
#systemctl restart ceph.target

Review the disk/osd tree,

ceph osd tree

Check the OSD usage!

ceph osd stat

Check the Metadata services,

ceph mds stat

Ref. https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/2/html-single/administration_guide/


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