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Chapter 6. Volume cloning for single node OpenShift

A clone is a duplicate of an existing storage volume that can be used like any standard volume. You create a clone of a volume to make a point in time copy of the data. A persistent volume claim (PVC) cannot be cloned with a different size.

Prerequisites

  • Ensure that the source PVC is in Bound state and not in use.
  • Ensure that the StorageClass is the same as that of the parent.

Procedure

  1. Identify the storage class of the source PVC.

  2. Save the following YAML to a file with a name such as odf-lvm-vol-clone.yaml to create a volume clone. 

    # Sample YAML to clone a volume
# pvc-clone.yaml
apiVersion: v1
kind: PersistentVolumeClaim
Metadata:
  name: lvm-block-1-clone
Spec:
  storageClassName: odf-lvm-vg1
  dataSource:
    name: lvm-block-1
    kind: PersistentVolumeClaim
  accessModes:
   - ReadWriteOnce
  volumeMode: Block
  Resources:
    Requests:
      storage: 2Gi
The cloned PVC has write access.
    Copy to Clipboard Toggle word wrap
  3. Create the policy by running the following command: 
# oc create -f odf-lvm-vol-clone.yaml -ns lvm-policy-ns
Copy to Clipboard Toggle word wrap

Procedure

  • To delete the cloned volume, you can delete the cloned PVC. 
oc delete pvc <clone-pvc-name> -n <namespace>
Copy to Clipboard Toggle word wrap
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