ONTAP 9.14

to Japanese version

Configure the ONTAP Mediator and clusters for SnapMirror Business Continuity

SnapMirror Business Continuity (SM-BC) utilizes peered clusters to ensure your data is available in the event of a failover scenario. The ONTAP Mediator is a key resource ensuring business continuity, monitoring the health of each cluster. To configure SM-BC, you must first install the ONTAP Mediator and ensure you primary and secondary clusters are configured properly.

Once you have installed the ONTAP Mediator and configured your clusters, you must Initialize the ONTAP mediator for SM-BC the ONTAP Mediator for use with SM-BC. You must then Create, initialize, and map the consistency group for SM-BC

ONTAP Mediator

The ONTAP Mediator establishes a quorum for the ONTAP clusters in an SM-BC relationship. It coordinates automated failover when a failure is detected, determining which cluster acts as the primary and ensuring data is served to and from the correct destination.

Prerequisites for the ONTAP Mediator
  • The ONTAP Mediator includes its own set of prerequisites. You must meet these prerequisites before installing the mediator.

  • By default, the ONTAP Mediator provides service through TCP port 31784. You should make sure that port 31784 is open and available between the ONTAP clusters and the mediator.

Install the ONTAP Mediator and confirm cluster configuration

Proceed through each of the following steps. For each step, you should confirm that the specific configuration has been performed. Use the link included after each step to get more information as needed.

  1. Install the ONTAP Mediator service before you ensure that your source and destination clusters are configured properly.

  2. Confirm that a cluster peering relationship exists between the clusters.

    The default IPspace is required by SM-BC for cluster peer relationships. A custom IPspace is not supported.
  3. Confirm that the Storage VMs are created on each cluster.

  4. Confirm that a peer relationship exists between the Storage VMs on each cluster.

  5. Confirm that the volumes exist for your LUNs.

  6. Confirm that at least one SAN LIF is created on each node in the cluster.

  7. Confirm that the necessary LUNs are created and mapped to an igroup, which is used to map LUNs to the initiator on the application host.

  8. Rescan the application host to discover any new LUNs.

Initialize the ONTAP mediator for SM-BC

Once you have installed the ONTAP Mediator and confirmed you cluster configuration, you must initialize the ONTAP Mediator for cluster monitoring. You can initialize the ONTAP Mediator using ONTAP System Manager or the ONTAP CLI.

ONTAP System Manager

With ONTAP System Manager, you can configure the ONTAP Mediator server for automated failover. You can also replace the self-signed SSL and CA with the third party validated SSL Certificate and CA if you have not already done so.

  1. Navigate to Protection > Overview > Mediator > Configure.

  2. Select Add, and enter the following ONTAP Mediator server information:

    • IPv4 address

    • Username

    • Password

    • Certificate


You can initialize the ONTAP Mediator from either the primary or secondary cluster using the ONTAP CLI. When you issue the mediator add command on one cluster, the ONTAP Mediator is automatically added on the other cluster.

  1. Initialize Mediator on one of the clusters:

    snapmirror mediator add -mediator-address IP_Address -peer-cluster cluster_name -username user_name


    cluster1::> snapmirror mediator add -mediator-address -peer-cluster cluster2 -username mediatoradmin
    Notice: Enter the mediator password.
    Enter the password: ******
    Enter the password again: ******
  2. Check the status of the Mediator configuration:

    snapmirror mediator show

    Mediator Address Peer Cluster     Connection Status Quorum Status
    ---------------- ---------------- ----------------- -------------     cluster-2        connected         true

    Quorum Status indicates whether the SnapMirror consistency group relationships are synchronized with the mediator; a status of true indicates successful synchronization.

Top of Page