18.2. Setting Ceph OSD full thresholds by updating the StorageCluster CR

You can set Ceph OSD full thresholds by updating the StorageCluster CR. Use this procedure if you want to override the default settings.

full

Use this following command to update the Ceph OSD full ratio in case Ceph prevents the IO operation on OSDs that reached the specified capacity. The default is 0.85.

For example, to set Ceph OSD full ratio to 0.9:

$ oc patch storagecluster ocs-storagecluster -n openshift-storage --type json --patch '[{ "op": "replace", "path": "/spec/managedResources/cephCluster/fullRatio", "value": 0.90 }]'

backfillfull

Use the following command to set the Ceph OSDd backfillfull ratio in case Ceph denies backfilling to the OSD that reached the capacity specified. The default value is 0.80.

For example, set backfill full to 0.85:

$ oc patch storagecluster ocs-storagecluster -n openshift-storage --type json --patch '[{ "op": "replace", "path": "/spec/managedResources/cephCluster/backfillFullRatio", "value": 0.85 }]'

nearfull

Use the following command to set the Ceph OSD nearfull ratio in case Ceph returns the nearfull OSDs message when the cluster reaches the capacity specified. The default value is 0.75.

For example, set nearfull to 0.8:

$ oc patch storagecluster ocs-storagecluster -n openshift-storage --type json --patch '[{ "op": "replace", "path": "/spec/managedResources/cephCluster/nearFullRatio", "value": 0.8 }]'