Replacing operational or failed storage devices on VMware infrastructure

Use this information to replace an operational or failed storage devices on VMware infrastructure.

Before you begin

Ensure that the data is resilient.
In the OpenShift Web Console, click Storage > 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.

About this task

Create a new Persistent Volume Claim (PVC) on a new volume, and remove the old object storage device (OSD) when one or more virtual machine disks (VMDK) needs to be replaced in Fusion Data Foundation which is deployed dynamically on VMware infrastructure.

Procedure

Identify the OSD that needs to be replaced and the OpenShift Container Platform node that has the OSD scheduled on it.

oc get -n openshift-storage pods -l app=rook-ceph-osd -o wide

Example output:

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>

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.
```
$ osd_id_to_remove=0
oc scale -n openshift-storage deployment rook-ceph-osd-${osd_id_to_remove} --replicas=0
```
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:
```
deployment.extensions/rook-ceph-osd-0 scaled
```

Verify that the rook-ceph-osd pod is terminated.

oc get -n openshift-storage pods -l ceph-osd-id=${osd_id_to_remove}

Example output:

No resources found.

Important: If the rook-ceph-osd pod is in the terminating state, use the force option to delete the pod.

oc delete pod rook-ceph-osd-0-6d77d6c7c6-m8xj6 --force --grace-period=0

Example output:

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

Remove the old OSD from the cluster so that you can add a new OSD.
1. Delete any old ocs-osd-removal jobs.
```
oc delete -n openshift-storage job ocs-osd-removal-job
```
```
job.batch "ocs-osd-removal-job" deleted
```
2. Navigate to the openshift-storage project.
```
oc project openshift-storage
```
3. Remove the old OSD from the cluster.
```
oc process -n openshift-storage ocs-osd-removal -p FAILED_OSD_IDS=${osd_id_to_remove} -p FORCE_OSD_REMOVAL=false |oc create -n openshift-storage -f -
```
  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.
```
oc get pod -l job-name=ocs-osd-removal-job -n openshift-storage
```

Ensure that the OSD removal is completed

oc logs -l job-name=ocs-osd-removal-job -n openshift-storage --tail=-1 | egrep -i 'completed removal'

Example output:

2022-05-10 06:50:04.501511 I | cephosd: completed removal of OSD 0

Important: If the ocs-osd-removal-job pod fails and the pod is not in the expected Completed state, check the pod logs for further debugging.

For example:

# oc logs -l job-name=ocs-osd-removal-job -n openshift-storage --tail=-1

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 Fusion Data Foundation nodes.
1. Get the PVC name(s) of the replaced OSD(s) from the logs of ocs-osd-removal-job pod.
```
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"
```
2. For each of the previously identified nodes, do the following:
  1. Create a debug pod and chroot to the host on the storage node.
```
oc debug node/<node name>
```
    where <node name> is the name of the node.
```
$ chroot /host
```
  2. Find a relevant device name based on the PVC names identified in the previous step.
```
dmsetup ls| grep <pvc name>
```
    where <pvc name> is the name of the PVC.
    Example output:
    ocs-deviceset-xxx-xxx-xxx-xxx-block-dmcrypt (253:0)
  3. Remove the mapped device.
```
$ cryptsetup luksClose --debug --verbose ocs-deviceset-xxx-xxx-xxx-xxx-block-dmcrypt
```
    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.
    $ ps -ef | grep crypt
    
    Terminate the process using the kill command.
    kill -9 <PID>
    where <PID>is the process ID.
    
    Verify that the device name is removed.
    $ dmsetup ls
Delete the ocs-osd-removal job.
```
oc delete -n openshift-storage job ocs-osd-removal-job
```
Example output:
```
job.batch "ocs-osd-removal-job" deleted
```
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.

What to do next

Verify that there is a new OSD running.

oc get -n openshift-storage pods -l app=rook-ceph-osd

Example output:

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

Verify that there is a new PVC created which is in the Bound state.

oc get -n openshift-storage pvc

Example output:

NAME                      STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
           ocs-deviceset-0-0-2s6w4   Bound    pvc-7c9bcaf7-de68-40e1-95f9-0b0d7c0ae2fc   512Gi      RWO            thin            5m      
           ocs-deviceset-1-0-q8fwh   Bound    pvc-9e7e00cb-6b33-402e-9dc5-b8df4fd9010f   512Gi      RWO            thin            1d20h
           ocs-deviceset-2-0-9v8lq   Bound    pvc-38cdfcee-ea7e-42a5-a6e1-aaa6d4924291   512Gi      RWO            thin            1d20h

If cluster-wide encryption is enabled on the cluster, verify that the new OSD devices are encrypted.
1. Identify the nodes where the new OSD pods are running, where <OSD-pod-name> is the name of the OSD pod.
```
oc get -n openshift-storage -o=custom-columns=NODE:.spec.nodeName pod/<OSD-pod-name>
```
  For example:
```
oc get -n openshift-storage -o=custom-columns=NODE:.spec.nodeName pod/rook-ceph-osd-0-544db49d7f-qrgqm
```
  Example output:
```
NODE
compute-1
```
2. For each of the nodes identified in the previous step, do the following:
  1. Create a debug pod and open a chroot environment for the selected host(s), where <node name> is the name of the node.
```
oc debug node/<node name>
```
```
$ chroot /host
```
  2. Check for the crypt keyword beside the ocs-deviceset name(s).
```
$ lsblk
```
Log in to OpenShift Web Console and view the storage dashboard.