To maintain a quorum between Ceph MONs, the cluster should always have more than half of the available monitors in a Ceph cluster. Checking the quorum status of a cluster is very useful at the time of MON troubleshooting. You can check the quorum status by using the ceph command and the quorum_status subcommand:
# ceph quorum_status -f json-pretty
The following screenshot displays the output of this command:
The quorum status displays election_epoch, which is the election version number, and quorum_leader_name, which denotes the hostname of the quorum leader. It also displays the MON map epoch and cluster ID. ...