Chapter 9. Replacing storage nodes

You can choose one of the following procedures to replace storage nodes:

9.1. Replacing operational nodes on Red Hat OpenStack Platform installer-provisioned infrastructure

Use this procedure to replace an operational node on Red Hat OpenStack Platform installer-provisioned infrastructure (IPI).

Procedure

  1. Log in to OpenShift Web Console and click ComputeNodes.
  2. Identify the node that needs to be replaced. Take a note of its Machine Name.
  3. Mark the node as unschedulable using the following command:

    $ oc adm cordon <node_name>
  4. Drain the node using the following command:

    $ oc adm drain <node_name> --force --delete-local-data --ignore-daemonsets
    Important

    This activity may take at least 5-10 minutes or more. Ceph errors generated during this period are temporary and are automatically resolved when the new node is labeled and functional.

  5. Click ComputeMachines. Search for the required machine.
  6. Besides the required machine, click the Action menu (⋮)Delete Machine.
  7. Click Delete to confirm the machine deletion. A new machine is automatically created.
  8. Wait for new machine to start and transition into Running state.

    Important

    This activity may take at least 5-10 minutes or more.

  9. Click ComputeNodes, confirm if the new node is in Ready state.
  10. Apply the OpenShift Container Storage label to the new node using any one of the following:

    From User interface
    1. For the new node, click Action Menu (⋮)Edit Labels
    2. Add cluster.ocs.openshift.io/openshift-storage and click Save.
    From Command line interface
    • Execute the following command to apply the OpenShift Container Storage label to the new node:

      $ oc label node <new_node_name> cluster.ocs.openshift.io/openshift-storage=""

Verification steps

  1. Execute the following command and verify that the new node is present in the output:

    $ oc get nodes --show-labels | grep cluster.ocs.openshift.io/openshift-storage= |cut -d' ' -f1
  2. Click WorkloadsPods, confirm that at least the following pods on the new node are in Running state:

    • csi-cephfsplugin-*
    • csi-rbdplugin-*
  3. Verify that all other required OpenShift Container Storage pods are in Running state.
  4. If verification steps fail, kindly contact Red Hat Support.

9.2. Replacing failed nodes on Red Hat OpenStack Platform installer-provisioned infrastructure

Perform this procedure to replace a failed node which is not operational on Red Hat OpenStack Platform installer-provisioned infrastructure (IPI) for OpenShift Container Storage.

Procedure

  1. Log in to OpenShift Web Console and click ComputeNodes.
  2. Identify the faulty node and click on its Machine Name.
  3. Click ActionsEdit Annotations, and click Add More.
  4. Add machine.openshift.io/exclude-node-draining and click Save.
  5. Click ActionsDelete Machine, and click Delete.
  6. A new machine is automatically created, wait for new machine to start.

    Important

    This activity may take at least 5-10 minutes or more. Ceph errors generated during this period are temporary and are automatically resolved when the new node is labeled and functional.

  7. Click ComputeNodes, confirm if the new node is in Ready state.
  8. Apply the OpenShift Container Storage label to the new node using any one of the following:

    From User interface
    1. For the new node, click Action Menu (⋮)Edit Labels
    2. Add cluster.ocs.openshift.io/openshift-storage and click Save.
    From Command line interface
    • Execute the following command to apply the OpenShift Container Storage label to the new node:

      $ oc label node <new_node_name> cluster.ocs.openshift.io/openshift-storage=""
  9. [Optional]: If the failed Red Hat OpenStack Platform instance is not removed automatically, terminate the instance from Red Hat OpenStack Platform console.

Verification steps

  1. Execute the following command and verify that the new node is present in the output:

    $ oc get nodes --show-labels | grep cluster.ocs.openshift.io/openshift-storage= |cut -d' ' -f1
  2. Click WorkloadsPods, confirm that at least the following pods on the new node are in Running state:

    • csi-cephfsplugin-*
    • csi-rbdplugin-*
  3. Verify that all other required OpenShift Container Storage pods are in Running state.
  4. If verification steps fail, kindly contact Red Hat Support.