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Chapter 5. OpenShift Container Storage deployed using local storage devices

5.1. Replacing failed storage devices on Amazon EC2 infrastructure

When you need to replace a storage device on an Amazon EC2 (storage-optimized I3) infrastructure, you must replace the storage node. For information about how to replace nodes, see Replacing failed storage nodes on Amazon EC2 infrastructure.

5.2. Replacing operational or failed storage devices on clusters backed by local storage devices

You can replace an object storage device (OSD) in OpenShift Container Storage deployed using local storage devices on the following infrastructures:

  • Bare metal
  • VMware
  • Red Hat Virtualization

Use this procedure when one or more underlying storage devices need to be replaced.

Prerequisites

  • Red Hat recommends that replacement devices are configured with similar infrastructure and resources to the device being replaced.
  • If you upgraded to OpenShift Container Storage 4.7 from a previous version and have not already created a LocalVolumeSet object to enable automatic provisioning of devices, do so now by following the procedure described in Post-update configuration changes for clusters backed by local storage.
  • If you upgraded to OpenShift Container Storage 4.7 from a previous version and have not already created the LocalVolumeDiscovery object, do so now by following the procedure described in Post-update configuration changes for clusters backed by local storage.
  • Ensure that the data is resilient.

    • On the OpenShift Web console, navigate to Storage → Overview.
    • Under Persistent Storage in the Status card, confirm that the Data Resiliency has a green tick mark.

Procedure

  1. Remove the underlying storage device from relevant worker node.
  2. Verify that relevant OSD Pod has moved to CrashLoopBackOff state.

    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.

  3. Scale down the OSD deployment for the OSD to be replaced.

    $ 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
  4. 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 in openshift-storage namespace.
    Note

    If the rook-ceph-osd pod is in terminating state for more than a few minutes, use the force option to delete the pod.

    $ oc delete -n openshift-storage pod rook-ceph-osd-0-6d77d6c7c6-m8xj6 --grace-period=0 --force

    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
  5. Remove the old OSD from the cluster so that a new OSD can be added.

    1. Delete any old ocs-osd-removal jobs.

      $ oc delete -n openshift-storage job ocs-osd-removal-job

      Example output:

      job.batch "ocs-osd-removal-job" deleted
    2. Change 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} |oc create -n openshift-storage -f -

      You can remove more than one OSD by adding comma separated OSD IDs in the command. (For example: FAILED_OSD_IDS=0,1,2)

      Warning

      This step results in OSD being completely removed from the cluster. Ensure that the correct value of osd_id_to_remove is provided.

  6. Verify that the OSD is removed successfully by checking the status of the ocs-osd-removal 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
    Note

    If ocs-osd-removal 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
  7. 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 Container Storage nodes.

    1. Get 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’

      For example:

      2021-05-12 14:31:34.666000 I | cephosd: removing the OSD PVC "ocs-deviceset-xxxx-xxx-xxx-xxx"
    2. For each of the nodes identified in step #1, do the following:

      1. Create a debug pod and chroot to the host on the storage node.

        $ oc debug node/<node name>
        $ chroot /host
      2. Find relevant device name based on the PVC names identified in the previous step

        sh-4.4# dmsetup ls| grep <pvc name>
        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
        Note

        If the above command gets stuck due to insufficient privileges, run the following commands:

        • Press CTRL+Z to exit the above command.
        • Find PID of the process which was stuck.

          $ ps -ef | grep crypt
        • Terminate the process using kill command.

          $ kill -9 <PID>
        • Verify that the device name is removed.

          $ dmsetup ls
  8. Find the persistent volume (PV) that need to be deleted by the command:

    $ oc get pv -L kubernetes.io/hostname | grep localblock | grep Released
    
    local-pv-d6bf175b           1490Gi       RWO         Delete          Released            openshift-storage/ocs-deviceset-0-data-0-6c5pw      localblock      2d22h       compute-1
  9. Delete the persistent volume.

    $ oc delete pv local-pv-d6bf175b
  10. Physically add a new device to the node.
  11. Use the following command to track provisioning of persistent volumes for devices that match the deviceInclusionSpec. It can take a few minutes to provision persistent volumes.

    $ oc -n openshift-local-storage describe localvolumeset localblock

    Example output:

    [...]
    Status:
      Conditions:
        Last Transition Time:          2020-11-17T05:03:32Z
        Message:                       DiskMaker: Available, LocalProvisioner: Available
        Status:                        True
        Type:                          DaemonSetsAvailable
        Last Transition Time:          2020-11-17T05:03:34Z
        Message:                       Operator reconciled successfully.
        Status:                        True
        Type:                          Available
      Observed Generation:             1
      Total Provisioned Device Count: 4
    Events:
    Type    Reason      Age          From                Message
    ----    ------      ----         ----                -------
    Normal  Discovered  2m30s (x4    localvolumeset-     node.example.com -
            NewDevice   over 2m30s)  symlink-controller  found possible
                                                         matching disk,
                                                         waiting 1m to claim
    Normal  FoundMatch  89s (x4      localvolumeset-     node.example.com -
            ingDisk     over 89s)    symlink-controller  symlinking matching
                                                         disk

    Once the persistent volume is provisioned, a new OSD pod is automatically created for the provisioned volume.

  12. Delete the ocs-osd-removal job(s).

    $ 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.

Verification steps

  1. 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
    Note

    If the new OSD does not show as Running after a few minutes, restart the rook-ceph-operator pod to force a reconciliation.

    $ oc delete pod -n openshift-storage -l app=rook-ceph-operator

    Example output:

    pod "rook-ceph-operator-6f74fb5bff-2d982" deleted
  2. Verify that a new PVC is created.

    $ oc get -n openshift-storage pvc | grep localblock

    Example output:

    ocs-deviceset-0-0-c2mqb   Bound    local-pv-b481410         1490Gi     RWO            localblock                    5m
    ocs-deviceset-1-0-959rp   Bound    local-pv-414755e0        1490Gi     RWO            localblock                    1d20h
    ocs-deviceset-2-0-79j94   Bound    local-pv-3e8964d3        1490Gi     RWO            localblock                    1d20h
  3. (Optional) If cluster-wide encryption is enabled on the cluster, verify that the new OSD devices are encrypted.

    1. Identify the node(s) where the new OSD pod(s) are running.

      $ oc get -o=custom-columns=NODE:.spec.nodeName pod/<OSD pod name>

      For example:

      oc get -o=custom-columns=NODE:.spec.nodeName pod/rook-ceph-osd-0-544db49d7f-qrgqm
    2. For each of the nodes identified in previous step, do the following:

      1. Create a debug pod and open a chroot environment for the selected host(s).

        $ oc debug node/<node name>
        $ chroot /host
      2. Run “lsblk” and check for the “crypt” keyword beside the ocs-deviceset name(s)

        $ lsblk
  4. Log in to OpenShift Web Console and check the OSD status on the storage dashboard.

    Figure 5.1. OSD status in OpenShift Container Platform storage dashboard after device replacement

    RHOCP storage dashboard showing the healthy OSD.
Note

A full data recovery may take longer depending on the volume of data being recovered.

5.3. Replacing operational or failed storage devices on IBM Power Systems

You can replace an object storage device (OSD) in OpenShift Container Storage deployed using local storage devices on IBM Power Systems. Use this procedure when an underlying storage device needs to be replaced.

Prerequisites

  • Ensure that the data is resilient.

    • On the OpenShift Web console, navigate to Storage → Overview.
    • Under Persistent Storage in the Status card, confirm that the Data Resiliency has a green tick mark.

Procedure

  1. 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-0-86bf8cdc8-4nb5t   0/1     crashLoopBackOff   0   24h   10.129.2.26     worker-0     <none>       <none>
    rook-ceph-osd-1-7c99657cfb-jdzvz   1/1     Running   0          24h     10.128.2.46     worker-1     <none>       <none>
    rook-ceph-osd-2-5f9f6dfb5b-2mnw9    1/1     Running   0          24h     10.131.0.33    worker-2     <none>       <none>

    In this example, rook-ceph-osd-0-86bf8cdc8-4nb5t needs to be replaced and worker-0 is the RHOCP node on which the OSD is scheduled.

    Note

    If the OSD to be replaced is healthy, the status of the pod will be Running.

  2. Scale down the OSD deployment for the OSD to be replaced.

    $ 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.apps/rook-ceph-osd-0 scaled
  3. 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 in openshift-storage namespace.
    Note

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

    $ oc delete -n openshift-storage pod rook-ceph-osd-0-86bf8cdc8-4nb5t --grace-period=0 --force

    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-0-86bf8cdc8-4nb5t" force deleted
  1. Remove the old OSD from the cluster so that a new OSD can be added.

    1. Identify the DeviceSet associated with the OSD to be replaced.

      $ oc get -n openshift-storage -o yaml deployment rook-ceph-osd-${osd_id_to_remove} | grep ceph.rook.io/pvc

      Example output:

      ceph.rook.io/pvc: ocs-deviceset-localblock-0-data-0-64xjl
          ceph.rook.io/pvc: ocs-deviceset-localblock-0-data-0-64xjl

      In this example, the PVC name is ocs-deviceset-localblock-0-data-0-64xjl.

    2. Delete any old ocs-osd-removal jobs.

      $ oc delete -n openshift-storage job ocs-osd-removal-job

      Example output:

      job.batch "ocs-osd-removal-job" deleted
    3. Change to the openshift-storage project.

      $ oc project openshift-storage
    4. Remove the old OSD from the cluster

      $ oc process -n openshift-storage ocs-osd-removal -p FAILED_OSD_IDS=${osd_id_to_remove} | oc -n openshift-storage create -f -

      You can remove more than one OSD by adding comma separated OSD IDs in the command. (For example: FAILED_OSD_IDS=0,1,2)

      Warning

      This step results in OSD being completely removed from the cluster. Make sure that the correct value of osd_id_to_remove is provided.

  2. Verify that the OSD is removed successfully by checking the status of the ocs-osd-removal pod. A status of Completed confirms that the OSD removal job completed successfully.

    $ oc get pod -l job-name=ocs-osd-removal-job -n openshift-storage
    Note

    If ocs-osd-removal 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
  3. Delete the persistent volume claim (PVC) resources associated with the OSD to be replaced.

    1. Identify the PV associated with the PVC.

      $ oc get -n openshift-storage pvc ocs-deviceset-<x>-<y>-<pvc-suffix>

      where, x, y, and pvc-suffix are the values in the DeviceSet identified in an step 4(a).

      Example output:

      NAME                      STATUS        VOLUME        CAPACITY   ACCESS MODES   STORAGECLASS   AGE
      ocs-deviceset-localblock-0-data-0-64xjl   Bound    local-pv-8137c873    256Gi      RWO     localblock     24h

      In this example, the associated PV is local-pv-8137c873.

    2. Identify the name of the device to be replaced.

      $ oc get pv local-pv-<pv-suffix> -o yaml | grep path

      where, pv-suffix is the value in the PV name identified in an earlier step.

      Example output:

      path: /mnt/local-storage/localblock/vdc

      In this example, the device name is vdc.

    3. Identify the prepare-pod associated with the OSD to be replaced.

      $ oc describe -n openshift-storage pvc ocs-deviceset-<x>-<y>-<pvc-suffix> | grep Mounted

      where, x, y, and pvc-suffix are the values in the DeviceSet identified in an earlier step.

      Example output:

      Mounted By:    rook-ceph-osd-prepare-ocs-deviceset-localblock-0-data-0-64knzkc

      In this example the prepare-pod name is rook-ceph-osd-prepare-ocs-deviceset-localblock-0-data-0-64knzkc.

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

      $ oc delete -n openshift-storage pod rook-ceph-osd-prepare-ocs-deviceset-<x>-<y>-<pvc-suffix>-<pod-suffix>

      where, x, y, pvc-suffix, and pod-suffix are the values in the osd-prepare pod name identified in an earlier step.

      Example output:

      pod "rook-ceph-osd-prepare-ocs-deviceset-localblock-0-data-0-64knzkc" deleted
    5. Delete the PVC associated with the OSD to be replaced.

      $ oc delete -n openshift-storage pvc ocs-deviceset-<x>-<y>-<pvc-suffix>

      where, x, y, and pvc-suffix are the values in the DeviceSet identified in an earlier step.

      Example output:

      persistentvolumeclaim "ocs-deviceset-localblock-0-data-0-64xjl" deleted
  4. Delete the PV associated with the device to be replaced, which was identified in earlier steps. In this example, the PV name is local-pv-8137c873.

    $ oc delete pv local-pv-8137c873

    Example output:

    persistentvolume "local-pv-8137c873" deleted
  5. Replace the old device and use the new device to create a new OpenShift Container Platform PV.

    1. Log in to OpenShift Container Platform node with the device to be replaced. In this example, the OpenShift Container Platform node is worker-0.

      $ oc debug node/worker-0

      Example output:

      Starting pod/worker-0-debug ...
      To use host binaries, run `chroot /host`
      Pod IP: 192.168.88.21
      If you don't see a command prompt, try pressing enter.
      # chroot /host
    2. Record the /dev/disk that is to be replaced using the device name, vdc, identified earlier.

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

      Example output:

      total 0
      drwxr-xr-x. 2 root root 17 Nov  18 15:23 .
      drwxr-xr-x. 3 root root 24 Nov  18 15:23 ..
      lrwxrwxrwx. 1 root root  8 Nov  18 15:23 vdc -> /dev/vdc
    3. Find the name of the LocalVolumeSet CR, and remove or comment out the device /dev/disk that is to be replaced.

      $ oc get -n openshift-local-storage localvolumeset
      NAME          AGE
      localblock   25h
  6. Log in to OpenShift Container Platform node with the device to be replaced and remove the old symlink.

    $ oc debug node/worker-0

    Example output:

    Starting pod/worker-0-debug ...
    To use host binaries, run `chroot /host`
    Pod IP: 192.168.88.21
    If you don't see a command prompt, try pressing enter.
    # chroot /host
    1. Identify the old symlink for the device name to be replaced. In this example, the device name is vdc.

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

      Example output:

      total 0
      drwxr-xr-x. 2 root root 17 Nov  18 15:23 .
      drwxr-xr-x. 3 root root 24 Nov  18 15:23 ..
      lrwxrwxrwx. 1 root root  8 Nov  18 15:23 vdc -> /dev/vdc
    2. Remove the symlink.

      # rm /mnt/local-storage/localblock/vdc
    3. Verify that the symlink is removed.

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

      Example output:

      total 0
      drwxr-xr-x. 2 root root 6 Nov 18 17:11 .
      drwxr-xr-x. 3 root root 24 Nov 18 15:23 ..
      Important

      For new deployments of OpenShift Container Storage 4.5 or later, LVM is not in use, ceph-volume raw mode is in play instead. Therefore, additional validation is not needed and you can proceed to the next step.

  7. Replace the device with the new device.
  8. Log back into the correct OpenShift Cotainer Platform node and identify the device name for the new drive. The device name must change unless you are reseating the same device.

    # lsblk

    Example output:

    NAME                         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
    vda                          252:0    0   40G  0 disk
    |-vda1                       252:1    0    4M  0 part
    |-vda2                       252:2    0  384M  0 part /boot
    `-vda4                       252:4    0 39.6G  0 part
      `-coreos-luks-root-nocrypt 253:0    0 39.6G  0 dm   /sysroot
    vdb                          252:16   0  512B  1 disk
    vdd                          252:32   0  256G  0 disk

    In this example, the new device name is vdd.

  9. After the new /dev/disk is available ,it will be auto detected by localvolumeset.
  10. Verify that there is a new PV in Available state and of the correct size.

    $ oc get pv | grep 256Gi

    Example output:

    local-pv-1e31f771   256Gi   RWO    Delete  Bound  openshift-storage/ocs-deviceset-localblock-2-data-0-6xhkf   localblock    24h
    local-pv-ec7f2b80   256Gi   RWO    Delete  Bound  openshift-storage/ocs-deviceset-localblock-1-data-0-hr2fx   localblock    24h
    local-pv-8137c873   256Gi   RWO    Delete  Available                                                          localblock    32m
  11. Create new OSD for new device.

    1. Deploy the new OSD by restarting the rook-ceph-operator to force operator reconciliation.

      1. Identify the name of the rook-ceph-operator.

        $ oc get -n openshift-storage pod -l app=rook-ceph-operator

        Example output:

        NAME                                  READY   STATUS    RESTARTS   AGE
        rook-ceph-operator-85f6494db4-sg62v   1/1     Running   0          1d20h
      2. Delete the rook-ceph-operator.

        $ oc delete -n openshift-storage pod rook-ceph-operator-85f6494db4-sg62v

        Example output:

        pod "rook-ceph-operator-85f6494db4-sg62v" deleted

        In this example, the rook-ceph-operator pod name is rook-ceph-operator-85f6494db4-sg62v.

      3. Verify that the rook-ceph-operator pod is restarted.

        $ oc get -n openshift-storage pod -l app=rook-ceph-operator

        Example output:

        NAME                                  READY   STATUS    RESTARTS   AGE
        rook-ceph-operator-85f6494db4-wx9xx   1/1     Running   0          50s

        Creation of the new OSD may take several minutes after the operator restarts.

  12. Delete the ocs-osd-removal job(s).

    $ oc delete -n openshift-storage job ocs-osd-removal-job

    Example output:

    job.batch "ocs-osd-removal-job" deleted

Verfication steps

  • Verify that there is a new OSD running and a new PVC created.

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

    Example output:

    rook-ceph-osd-0-76d8fb97f9-mn8qz   1/1     Running   0          23m
    rook-ceph-osd-1-7c99657cfb-jdzvz   1/1     Running   1          25h
    rook-ceph-osd-2-5f9f6dfb5b-2mnw9   1/1     Running   0          25h
    $ oc get -n openshift-storage pvc | grep localblock

    Example output:

    ocs-deviceset-localblock-0-data-0-q4q6b   Bound    local-pv-8137c873       256Gi     RWO         localblock         10m
    ocs-deviceset-localblock-1-data-0-hr2fx   Bound    local-pv-ec7f2b80       256Gi     RWO         localblock         1d20h
    ocs-deviceset-localblock-2-data-0-6xhkf   Bound    local-pv-1e31f771       256Gi     RWO         localblock         1d20h
  • Log in to OpenShift Web Console and view the storage dashboard.

    Figure 5.2. OSD status in OpenShift Container Platform storage dashboard after device replacement

    RHOCP storage dashboard showing the healthy OSD.

5.4. Replacing operational or failed storage devices on IBM Z or LinuxONE infrastructure

You can replace operational or failed storage devices on IBM Z or LinuxONE infrastructure with new SCSI disks.

IBM Z or LinuxONE supports SCSI FCP disk logical units (SCSI disks) as persistent storage devices from external disk storage. A SCSI disk can be identified by using its FCP Device number, two target worldwide port names (WWPN1 and WWPN2), and the logical unit number (LUN). For more information, see https://www.ibm.com/support/knowledgecenter/SSB27U_6.4.0/com.ibm.zvm.v640.hcpa5/scsiover.html

Prerequisites

  • Ensure that the data is resilient.

    • On the OpenShift Web console, navigate to Storage → Overview.
    • Under Persistent Storage in the Status card, confirm that the Data Resiliency has a green tick mark.

Procedure

  1. List all the disks with the following command.

    $ lszdev

    Example output:

    TYPE         ID
    zfcp-host    0.0.8204                                        yes  yes
    zfcp-lun     0.0.8204:0x102107630b1b5060:0x4001402900000000 yes  no    sda sg0
    zfcp-lun     0.0.8204:0x500407630c0b50a4:0x3002b03000000000  yes  yes   sdb sg1
    qeth         0.0.bdd0:0.0.bdd1:0.0.bdd2                      yes  no    encbdd0
    generic-ccw  0.0.0009                                        yes  no

    A SCSI disk is represented as a zfcp-lun with the structure <device-id>:<wwpn>:<lun-id> in the ID section. The first disk is used for the operating system. If one storage device fails, it can be replaced with a new disk.

  2. Remove the disk.

    Run the following command on the disk, replacing scsi-id with the SCSI disk identifier of the disk to be replaced.

    $ chzdev -d scsi-id

    For example, the following command removes one disk with the device ID 0.0.8204, the WWPN 0x500507630a0b50a4, and the LUN 0x4002403000000000 with the following command:

    $ chzdev -d 0.0.8204:0x500407630c0b50a4:0x3002b03000000000
  3. Append a new SCSI disk with the following command:

    $ chzdev -e 0.0.8204:0x500507630b1b50a4:0x4001302a00000000
    Note

    The device ID for the new disk must be the same as the disk to be replaced. The new disk is identified with its WWPN and LUN ID.

  4. List all the FCP devices to verify the new disk is configured.

    $ lszdev zfcp-lun
    TYPE         ID                                              ON   PERS  NAMES
    zfcp-lun     0.0.8204:0x102107630b1b5060:0x4001402900000000 yes  no    sda sg0
    zfcp-lun     0.0.8204:0x500507630b1b50a4:0x4001302a00000000  yes  yes   sdb sg1