Chapter 3. Dynamically provisioned OpenShift Data Foundation deployed on Red Hat Virtualization 3.1. Replacing operational or failed storage devices on Red Hat Virtualization installer-provisioned infrastructure Create a new Persistent Volume Claim (PVC) on a new volume, and remove the old object storage device (OSD). Prerequisites Ensure that the data is resilient. In the OpenShift Web Console, click Storage OpenShift Data Foundation . Click the Storage Systems tab, and then click ocs-storagecluster-storagesystem . In the Status card of Block and File dashboard, under the Overview tab, verify that Data Resiliency has a green tick mark. Procedure Identify the OSD that needs to be replaced and the OpenShift Container Platform node that has the OSD scheduled on it. Example output: In this example, rook-ceph-osd-0-6d77d6c7c6-m8xj6 needs to be replaced and compute-2 is the OpenShift Container platform node on which the OSD is scheduled. Note If the OSD to be replaced is healthy, the status of the pod will be Running . Scale down the OSD deployment for the OSD to be replaced. Each time you want to replace the OSD, update the osd_id_to_remove parameter with the OSD ID, and repeat this step. where, osd_id_to_remove is the integer in the pod name immediately after the rook-ceph-osd prefix. In this example, the deployment name is rook-ceph-osd-0 . Example output: Verify that the rook-ceph-osd pod is terminated. Example output: Important If the rook-ceph-osd pod is in terminating state, use the force option to delete the pod. Example output: Remove the old OSD from the cluster so that you can add a new OSD. Delete any old ocs-osd-removal jobs. Example output: Navigate to the openshift-storage project. Remove the old OSD from the cluster. <failed_osd_id> Is the integer in the pod name immediately after the rook-ceph-osd prefix. You can add comma separated OSD IDs in the command to remove more than one OSD, for example, FAILED_OSD_IDS=0,1,2 . The FORCE_OSD_REMOVAL value must be changed to true in clusters that only have three OSDs, or clusters with insufficient space to restore all three replicas of the data after the OSD is removed. Warning This step results in OSD being completely removed from the cluster. Ensure that the correct value of osd_id_to_remove is provided. Verify that the OSD was removed successfully by checking the status of the ocs-osd-removal-job pod. A status of Completed confirms that the OSD removal job succeeded. Ensure that the OSD removal is completed. Example output: Important If the ocs-osd-removal-job fails and the pod is not in the expected Completed state, check the pod logs for further debugging. For example: If encryption was enabled at the time of install, remove dm-crypt managed device-mapper mapping from the OSD devices that are removed from the respective OpenShift Data Foundation nodes. Get the PVC name(s) of the replaced OSD(s) from the logs of ocs-osd-removal-job pod. Example output: For each of the previously identified nodes, do the following: Create a debug pod and chroot to the host on the storage node. <node name> Is the name of the node. Find a relevant device name based on the PVC names identified in the step. <pvc name> Is the name of the PVC. Example output: Remove the mapped device. Important If the above command gets stuck due to insufficient privileges, run the following commands: Press CTRL+Z to exit the above command. Find the PID of the process which was stuck. Terminate the process using the kill command. <PID> Is the process ID. Verify that the device name is removed. Delete the ocs-osd-removal job. Example output: Note When using an external key management system (KMS) with data encryption, the old OSD encryption key can be removed from the Vault server as it is now an orphan key. Verfication steps Verify that there is a new OSD running. Example output: Verify that there is a new PVC created which is in Bound state. Optional: If cluster-wide encryption is enabled on the cluster, verify that the new OSD devices are encrypted. Identify the node(s) where the new OSD pod(s) are running. <OSD pod name> Is the name of the OSD pod. For example: For each of the previously identified nodes, do the following: Create a debug pod and open a chroot environment for the selected host(s). <node name> Is the name of the node. Check for the crypt keyword beside the ocs-deviceset name(s). Log in to OpenShift Web Console and view the storage dashboard.

Commands:
oc get -n openshift-storage pods -l app=rook-ceph-osd -o wide
rook-ceph-osd-0-6d77d6c7c6-m8xj6 0/1 CrashLoopBackOff 0 24h 10.129.0.16 compute-2 <none> <none> rook-ceph-osd-1-85d99fb95f-2svc7 1/1 Running 0 24h 10.128.2.24 compute-0 <none> <none> rook-ceph-osd-2-6c66cdb977-jp542 1/1 Running 0 24h 10.130.0.18 compute-1 <none> <none>
osd_id_to_remove=0
oc scale -n openshift-storage deployment rook-ceph-osd-USD{osd_id_to_remove} --replicas=0
deployment.extensions/rook-ceph-osd-0 scaled
oc get -n openshift-storage pods -l ceph-osd-id=USD{osd_id_to_remove}
No resources found.
oc delete pod rook-ceph-osd-0-6d77d6c7c6-m8xj6 --force --grace-period=0
warning: Immediate deletion does not wait for confirmation that the running resource has been terminated. The resource may continue to run on the cluster indefinitely. pod "rook-ceph-osd-0-6d77d6c7c6-m8xj6" force deleted
oc delete -n openshift-storage job ocs-osd-removal-job
job.batch "ocs-osd-removal-job"
oc project openshift-storage
oc process -n openshift-storage ocs-osd-removal -p FAILED_OSD_IDS= <failed_osd_id> FORCE_OSD_REMOVAL=false | oc create -n openshift-storage -f -
oc get pod -l job-name=ocs-osd-removal-job -n openshift-storage
oc logs -l job-name=ocs-osd-removal-job -n openshift-storage --tail=-1 | egrep -i 'completed removal'
2022-05-10 06:50:04.501511 I | cephosd: completed removal of OSD 0
oc logs -l job-name=ocs-osd-removal-job -n openshift-storage --tail=-1
oc logs -l job-name=ocs-osd-removal-job -n openshift-storage --tail=-1 |egrep -i 'pvc|deviceset'
2021-05-12 14:31:34.666000 I | cephosd: removing the OSD PVC "ocs-deviceset-xxxx-xxx-xxx-xxx"
oc debug node/ <node name>
chroot /host
dmsetup ls| grep <pvc name>
ocs-deviceset-xxx-xxx-xxx-xxx-block-dmcrypt (253:0)
cryptsetup luksClose --debug --verbose ocs-deviceset-xxx-xxx-xxx-xxx-block-dmcrypt
ps -ef | grep crypt
kill -9 <PID>
dmsetup ls
oc delete -n openshift-storage job ocs-osd-removal-job
job.batch "ocs-osd-removal-job" deleted
oc get -n openshift-storage pods -l app=rook-ceph-osd
rook-ceph-osd-0-5f7f4747d4-snshw 1/1 Running 0 4m47s rook-ceph-osd-1-85d99fb95f-2svc7 1/1 Running 0 1d20h rook-ceph-osd-2-6c66cdb977-jp542 1/1 Running 0 1d20h
oc get -n openshift-storage pvc
oc get -o=custom-columns=NODE:.spec.nodeName pod/ <OSD pod name>
get -o=custom-columns=NODE:.spec.nodeName pod/rook-ceph-osd-0-544db49d7f-qrgqm
oc debug node/ <node name>
chroot /host
lsblk