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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 OpenShift Virtualization.

About data volumes

DataVolume objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). You can create a data volume as either a standalone resource or by using the dataVolumeTemplate field in the virtual machine (VM) specification.

  • VM disk PVCs that are prepared by using standalone data volumes maintain an independent lifecycle from the VM. If you use the dataVolumeTemplate field in the VM specification to prepare the PVC, the PVC shares the same lifecycle as the VM.

Creating a blank disk image with data volumes

You can create a new blank disk image in a persistent volume claim by customizing and deploying a data volume configuration file.

Prerequisites

  • At least one available persistent volume.

  • Install the OpenShift CLI (oc).

Procedure

  1. Edit the DataVolume manifest:

    apiVersion: cdi.kubevirt.io/v1beta1
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

Additional resources