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Chapter 11. Volume cloning

A clone is a duplicate of an existing storage volume that is used as 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. You can create up to 512 clones per PVC for both CephFS and RADOS Block Device (RBD).

11.1. Creating a clone

Prerequisites

  • Source PVC must be in Bound state and must not be in use.
Note

Do not create a clone of a PVC if a Pod is using it. Doing so might cause data corruption because the PVC is not quiesced (paused).

Procedure

  1. Click StoragePersistent Volume Claims from the OpenShift Web Console.
  2. To create a clone, do one of the following:

    • Beside the desired PVC, click Action menu (⋮)Clone PVC.
    • Click on the PVC that you want to clone and click ActionsClone PVC.
  3. Enter a Name for the clone.
  4. Click Clone. You will be redirected to the new PVC details page.

    Note

    Clones are created with the access mode of the parent PVC. Currently, you cannot specify the access mode using the OpenShift Web Console UI. However, you can specify the access mode from the CLI using the YAML. For more information, see Provisioning a CSI volume clone.

  5. Wait for the cloned PVC status to become Bound.

    The cloned PVC is now available to be consumed by the pods. This cloned PVC is independent of its dataSource PVC.