Enable high availability mode in Azure

Microsoft Azure’s high availability mode should be enabled to reduce unplanned failover times and to enable NFSv4 support for Cloud Volumes ONTAP.

Starting with the Cloud Volumes ONTAP 9.10.1 release, we reduced the unplanned failover time for Cloud Volumes ONTAP HA pairs running in Microsoft Azure and added support for NFSv4. To make these enhancements available to Cloud Volumes ONTAP, you need to enable the high availability feature on your Azure subscription.

BlueXP will prompt you with these details in an Action Required message when the feature needs to be enabled on an Azure subscription.

Note the following:

  • There are no problems with the high availability of your Cloud Volumes ONTAP HA pair. This Azure feature works in concert with ONTAP to reduce the client observed application outage time for NFS protocols that result from unplanned failover events.

  • Enabling this feature is non-disruptive to Cloud Volumes ONTAP HA pairs.

  • Enabling this feature on your Azure subscription won’t cause issues to other VMs.

An Azure user who has "Owner" privileges can enable the feature from the Azure CLI.

  1. Access the Azure Cloud Shell from the Azure Portal

  2. Register the high availability mode feature:

    az account set -s AZURE_SUBSCRIPTION_NAME_OR_ID
    az feature register --name EnableHighAvailabilityMode --namespace Microsoft.Network
    az provider register -n Microsoft.Network
  3. Optionally verify that the feature is now registered:

    az feature show --name EnableHighAvailabilityMode --namespace Microsoft.Network

    The Azure CLI should return a result similar to the following:

      "id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/providers/Microsoft.Features/providers/Microsoft.Network/features/EnableHighAvailabilityMode",
      "name": "Microsoft.Network/EnableHighAvailabilityMode",
      "properties": {
        "state": "Registered"
      "type": "Microsoft.Features/providers/features"