Monitors, Managers, MDS and MON/MGR Placement

The eEKAS Cluster Status page includes tabs for Monitors, Managers, MDS and MON/MGR Placement. These views explain which cluster services are active and where important Ceph roles are running.

Ceph Monitors

Monitors maintain the cluster map and quorum. AIn healthythe monitortest setcluster, isall essentialfive fornodes reliable cluster operation. If monitorwere quorum is lost, cluster management and client operations can be affected.

Administrators should verify:members:

• expectedEEKASBG-1, monitorsrank are0, present,192.168.0.21:6789
• quorumEEKASBG-2, isrank stable,1, 192.168.0.22:6789
• monitorEEKASBG-3, placementrank follows2, the intended node design,192.168.0.23:6789
• noEEKASBG-4, monitor-relatedrank alerts3, are192.168.0.24:6789
present.
• EEKASBG-5, rank 4, 192.168.0.25:6789

The tab also showed Total Monitors: 5 and Monmap Epoch: 5.

Ceph Managers

Managers provide monitoring and management services for the Ceph cluster. TheyThe supporttest dashboards,cluster metricsshowed and operational modules. At least oneactive manager shouldEEKASBG-1.ynuwsd be active, withand standby managers availableon accordingEEKASBG-2, toEEKASBG-3, theEEKASBG-4 clusterand design.EEKASBG-5.

MDS Services

MDS services are relevant for CephFS metadata operations. IfThe test cluster showed no active MDS and standby MDS count 0. This is acceptable when no CephFS-backed services aredepend used,on MDS status becomes operationally important. If the environment does not use CephFS, MDS may be less central than OSD, MON and MGR health.MDS.

MON/MGR Placement

The MON/MGRplacement Placementtab viewshows helpswhich verifynodes whereshould monitorrun Monitor and managerManager rolesdaemons and which labels are placed.currently Placementpresent. shouldThe avoidtest concentratingcluster criticalshowed servicesEEKASBG-1 onwith a_admin, singlemon, failuremgr domain.and osd labels, and EEKASBG-2 through EEKASBG-5 with mon, mgr and osd labels.

Operational Checklist

Check	Expected Result
Monitor quorum	Stable and healthy.includes the expected monitors.
Manager state	One active manager and suitable standby coverage.
MDS state	Healthy if CephFS services are used.used; otherwise empty can be normal.
Placement	Critical roles distributed across suitable nodes.
Alerts	No actionable MON, MGR or MDS warnings.

Support Notes

When reporting cluster control-plane issues, include screenshots or copied status from Ceph Status, Monitors, Managers and MON/MGR Placement. Also include the node count, affected node and the time the issue started.