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Expanding virtual storage by adding blank disk images

You can increase your storage capacity or create new data partitions by adding blank disk images to container-native virtualization.

About DataVolumes

DataVolume objects are custom resources that are provided by the Containerized Data Importer (CDI) project. DataVolumes orchestrate import, clone, and upload operations that are associated with an underlying PersistentVolumeClaim (PVC). DataVolumes are integrated with KubeVirt, and they prevent a virtual machine from being started before the PVC has been prepared.

Creating a blank disk image with DataVolumes

You can create a new blank disk image in a PersistentVolumeClaim by customizing and deploying a DataVolume configuration file.

Prerequisites

  • At least one available PersistentVolume.

  • Install the OpenShift CLI (oc).

Procedure

  1. Edit the DataVolume configuration file:

    apiVersion: cdi.kubevirt.io/v1alpha1
kind: DataVolume
metadata:
  name: blank-image-datavolume
spec:
  source:
      blank: {}
  pvc:
    # Optional: Set the storage class or omit to accept the default
    # storageClassName: "hostpath"
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 500Mi

  2. Create the blank disk image by running the following command:

    $ oc create -f <blank-image-datavolume>.yaml

Template: DataVolume configuration file for blank disk images

blank-image-datavolume.yaml

apiVersion: cdi.kubevirt.io/v1alpha1
kind: DataVolume
metadata:
  name: blank-image-datavolume
spec:
  source:
      blank: {}
  pvc:
    # Optional: Set the storage class or omit to accept the default
    # storageClassName: "hostpath"
    accessModes:
      - ReadWriteOnce
    resources:
      requests:
        storage: 500Mi