Chapter 5. Creating mirroring StorageClass resource

The block volumes with mirroring enabled must be created using a new StorageClass that has additional imageFeatures required to enable faster image replication between managed clusters. The new features are exclusive-lock, object-map, and fast-diff. The default OpenShift Data Foundation StorageClass ocs-storagecluster-ceph-rbd does not include these features.

Note

This resource must be created on the Primary managed cluster and the Secondary managed cluster.

Procedure

  1. Save the following YAML to filename ocs-storagecluster-ceph-rbdmirror.yaml.

    allowVolumeExpansion: true
    apiVersion: storage.k8s.io/v1
    kind: StorageClass
    metadata:
      name: ocs-storagecluster-ceph-rbdmirror
    parameters:
      clusterID: openshift-storage
      csi.storage.k8s.io/controller-expand-secret-name: rook-csi-rbd-provisioner
      csi.storage.k8s.io/controller-expand-secret-namespace: openshift-storage
      csi.storage.k8s.io/fstype: ext4
      csi.storage.k8s.io/node-stage-secret-name: rook-csi-rbd-node
      csi.storage.k8s.io/node-stage-secret-namespace: openshift-storage
      csi.storage.k8s.io/provisioner-secret-name: rook-csi-rbd-provisioner
      csi.storage.k8s.io/provisioner-secret-namespace: openshift-storage
      imageFeatures: layering,exclusive-lock,object-map,fast-diff
      imageFormat: "2"
      pool: ocs-storagecluster-cephblockpool
    provisioner: openshift-storage.rbd.csi.ceph.com
    reclaimPolicy: Delete
    volumeBindingMode: Immediate
  2. Create the file on both the managed clusters.

    $ oc create -f ocs-storagecluster-ceph-rbdmirror.yaml

    Example output:

    storageclass.storage.k8s.io/ocs-storagecluster-ceph-rbdmirror created