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8.8.3.2. Cloning a PVC to a data volume

You can clone the persistent volume claim (PVC) of an existing virtual machine (VM) disk to a data volume by using the command line.

You create a data volume that references the original source PVC. The lifecycle of the new data volume is independent of the original VM. Deleting the original VM does not affect the new data volume or its associated PVC.

Cloning between different volume modes is supported for host-assisted cloning, such as cloning from a block persistent volume (PV) to a file system PV, as long as the source and target PVs belong to the kubevirt content type.

注記

Smart-cloning is faster and more efficient than host-assisted cloning because it uses snapshots to clone PVCs. Smart-cloning is supported by storage providers that support snapshots, such as Red Hat OpenShift Data Foundation.

Cloning between different volume modes is not supported for smart-cloning.

Prerequisites

  • You have installed the OpenShift CLI (oc).
  • The VM with the source PVC must be powered down.
  • If you clone a PVC to a different namespace, you must have permissions to create resources in the target namespace.

  • Additional prerequisites for smart-cloning:

    • Your storage provider must support snapshots.
    • The source and target PVCs must have the same storage provider and volume mode.

    • The value of the driver key of the VolumeSnapshotClass object must match the value of the provisioner key of the StorageClass object as shown in the following example:

      Example VolumeSnapshotClass object: 

      kind: VolumeSnapshotClass
apiVersion: snapshot.storage.k8s.io/v1
driver: openshift-storage.rbd.csi.ceph.com
# ...

      Example StorageClass object: 

      kind: StorageClass
apiVersion: storage.k8s.io/v1
# ...
provisioner: openshift-storage.rbd.csi.ceph.com

Procedure

  1. Create a DataVolume manifest as shown in the following example: 

    apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
  name: <datavolume>
    1 
    
spec:
  source:
    pvc:
      namespace: "<source_namespace>"
    2 
    
      name: "<my_vm_disk>"
    3 
    
  storage: {}
    1
    Specify the name of the new data volume.
    2
    Specify the namespace of the source PVC.
    3
    Specify the name of the source PVC.

  2. Create the data volume by running the following command: 

    $ oc create -f <datavolume>.yaml
    注記

    Data volumes prevent a VM from starting before the PVC is prepared. You can create a VM that references the new data volume while the PVC is being cloned.

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