Requirements for enabling Metro-DR

This section lists all the prerequisites for implementing the Disaster Recovery solution supported by IBM Storage Fusion Data Foundation.

  • You must have the following Red Hat OpenShift clusters that have network reachability between them:
    • Hub cluster where Red Hat Advanced Cluster Management (RHACM) for Kubernetes operator is installed.
    • Primary-managed cluster where Fusion Data Foundation is installed.
    • Secondary-managed cluster where Fusion Data Foundation is installed.
    Note: For configuring hub recovery setup, you need a 4th cluster which acts as the passive hub. The primary managed cluster (Site-1) can be co-situated with the active RHACM hub cluster while the passive hub cluster is situated along with the secondary managed cluster (Site-2). Alternatively, the active RHACM hub cluster can be placed in a neutral site (Site-3) that is not impacted by the failures of either of the primary managed cluster at Site-1 or the secondary cluster at Site-2. In this situation, if a passive hub cluster is used it can be placed with the secondary cluster at Site-2. For more information, see Configuring passive hub cluster.

    Hub recovery is a Technology Preview feature and is subject to Technology Preview support limitations.

  • Ensure that RHACM operator and Multicluster Hub is installed on the Hub cluster. For detailed instructions, see the Install guide within Red Hat Advanced Cluster Management for Kubernetes product documentation.
    After the operator is successfully installed, a popover with a message that the Web console update is available appears on the user interface. Click Refresh web console from this popover for the console changes to reflect.
    Important: Ensure that application traffic routing and redirection are configured appropriately.
  • On the Hub cluster,
    • Navigate to All Clusters > Infrastructure > Clusters.
    • Import or create the Primary-managed cluster and the Secondary-managed cluster by using the RHACM console.
    • Choose the appropriate options for your environment.

    For instructions, see Creating a cluster and Importing a target managed cluster to the hub cluster within the Clusters Red Hat Advanced Cluster Management for Kubernetes product documentation.

Warning: There are distance limitations between the locations where the OpenShift Container Platform managed clusters reside as well as the IBM Storage Ceph nodes. The network latency between the sites must be below 10-milliseconds round-trip time (RTT).