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