Metro Replication with OpenShift Virtualization

Support of Metro Replication with OpenShift Virtualization for CSI drivers.

Starting in CSM 1.14, the Replication module supports the metro volume replication for Persistent Volumes (PVs) created via virtualized workloads (VMs).

OpenShift Virtualization:

  • OpenShift Virtualization allows virtual machines (VMs) to run alongside container workloads within Kubernetes clusters, addressing the coexistence of legacy VM workloads and modern containers.

OpenShift Virtualization support with Metro Replication

  • Install the OpenShift Virtualization operator from the RedHat UI on OpenShift Cluster.

  • The Replication modes supported are: Metro

  • CSI Driver supported: PowerMax, PowerStore

  • Make sure a default storage class configured for metro replication. To set the replication storage class as the default, update the annotation as follows:

    kubectl patch storageclass replication-storageclass -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

  • Deploy a VM on the OCP cluster to provision a Persistent Volume (PV) using a data volume. The PV provisioned by the VM on the cluster will be created on the source as well as target arrays, as there is an active-active replication session between the two clusters.

  • Refer this document for creating virtual machine from the command line.

Access Metro Volume on cluster

  • Login to the VM using the virtctl binary:

    ./virtctl console <vm-name> -n <namespace>

  • Write data to Persistent Volume (PV):

      localhost:/# printf "Data written to PV" | dd  of=/dev/vda bs=1 count=150 conv=notrunc
  28+0 records in
  28+0 records out

  • Read data from Persistent Volume (PV):

      localhost:/# dd if=/dev/vda bs=1 count=150 conv=notrunc
  Data written to PV
  150+0 records in
  150+0 records out