9.3. Removing failed or unwanted Ceph OSDs provisioned using local storage devices

Procedure

1. Forcibly, mark the OSD down by scaling the replicas on the OSD deployment to 0. You can skip this step if the OSD is already down due to failure.

   # oc scale deployment rook-ceph-osd-<osd-id> --replicas=0

2. Remove the failed OSD from the cluster.

   # failed_osd_id=<osd_id>
   
   # oc process -n openshift-storage ocs-osd-removal -p FAILED_OSD_IDS=$failed_osd_id | oc create -f -

   where, FAILED_OSD_ID is the integer in the pod name immediately after the rook-ceph-osd prefix.

3. Verify that the OSD is removed successfully by checking the logs.

   # oc logs -n openshift-storage ocs-osd-removal-$<failed_osd_id>-<pod-suffix>

4. Optional: If you get an error as cephosd:osd.0 is NOT ok to destroy from the ocs-osd-removal-job pod in OpenShift Container Platform, see Troubleshooting the error cephosd:osd.0 is NOT ok to destroy while removing failed or unwanted Ceph OSDs.

5. Delete persistent volume claim (PVC) resources associated with the failed OSD.

   1. Get the PVC associated with the failed OSD.

      # oc get -n openshift-storage -o yaml deployment rook-ceph-osd-<osd-id> | grep ceph.rook.io/pvc

   2. Get the persistent volume (PV) associated with the PVC.

      # oc get -n openshift-storage pvc <pvc-name>

   3. Get the failed device name.

      # oc get pv <pv-name-from-above-command> -oyaml | grep path

   4. Get the prepare-pod associated with the failed OSD.

      # oc describe -n openshift-storage pvc ocs-deviceset-0-0-nvs68 | grep Mounted

   5. Delete the osd-prepare pod before removing the associated PVC.

      # oc delete -n openshift-storage pod <osd-prepare-pod-from-above-command>

   6. Delete the PVC associated with the failed OSD.

      # oc delete -n openshift-storage pvc <pvc-name-from-step-a>

6. Remove failed device entry from the LocalVolume custom resource (CR).

   1. Log in to node with the failed device.

      # oc debug node/<node_with_failed_osd>

   2. Record the /dev/disk/by-id/<id> for the failed device name.

      # ls -alh /mnt/local-storage/localblock/

7. Optional: In case, Local Storage Operator is used for provisioning OSD, login to the machine with {osd-id} and remove the device symlink.

   # oc debug node/<node_with_failed_osd>

   1. Get the OSD symlink for the failed device name.

      # ls -alh /mnt/local-storage/localblock

   2. Remove the symlink.

      # rm /mnt/local-storage/localblock/<failed-device-name>

8. Delete the PV associated with the OSD.