Create a subnet

You can add a subnet to the external network. Subnets are created under a groupnet.


  1. Click Cluster Management > Network Configuration > External Network.
  2. Click More > Add Subnet next to the groupnet that will contain the new subnet.
    The system displays the Create Subnet window.
  3. In the Name field, specify the name of the new subnet.
    The name can be up to 32 alphanumeric characters long and can include underscores or hyphens, but cannot include spaces or other punctuation.
  4. Optional: In the Description field, type a descriptive comment about the subnet.
    The comment can be no more than 128 characters.
  5. From the IP family area, select one of the following IP address formats for the subnet:
    • IPv4
    • IPv6
      Note Image

      IPv6 address format is not supported for IsilonSD Edge.

    All subnet settings and IP address pools added to the subnet must use the specified address format. You cannot modify the address family once the subnet has been created.
  6. In the Netmask field, specify a subnet mask or prefix length, depending on the IP family you selected.
    • For an IPv4 subnet, type a dot-decimal octet (x.x.x.x) that represents the subnet mask.
    • For an IPv6 subnet, type an integer (ranging from 1 to 128) that represents the network prefix length.
  7. In the Gateway Address field, type the IP address of the gateway through which the cluster routes communications to systems outside of the subnet.
  8. In the Gateway Priority field, type the priority (integer) that determines which subnet gateway will be installed as the default gateway on nodes that have more then one subnet.
    A value of 1 represents the highest priority.
  9. In the MTU list, type or select the size of the maximum transmission units the cluster uses in network communication. Any numerical value is allowed, but must be compatible with your network and the configuration of all devices in the network path. Common settings are 1500 (standard frames) and 9000 (jumbo frames).
    Although OneFS supports both 1500 MTU and 9000 MTU, using a larger frame size for network traffic permits more efficient communication on the external network between clients and cluster nodes. For example, if a subnet is connected through a 10 GbE interface and NIC aggregation is configured for IP address pools in the subnet, we recommend that you set the MTU to 9000. To benefit from using jumbo frames, all devices in the network path must be configured to use jumbo frames.
  10. If you plan to use SmartConnect for connection balancing, in the SmartConnect Service IP field, type the IP address that will receive all incoming DNS requests for each IP address pool according to the client connection policy. You must have at least one subnet configured with a SmartConnect service IP in order to use connection balancing.
  11. In the SmartConnect Service Name field, specify the SmartConnect service name.
  12. In the Advanced Settings section, you can enable VLAN tagging if you want to enable the cluster to participate in virtual networks.
    Note Image

    Configuring a VLAN requires advanced knowledge of network switches. Consult your network switch documentation before configuring your cluster for a VLAN.

  13. If you enable VLAN tagging, specify a VLAN ID that corresponds to the ID number for the VLAN set on the switch, with a value from 2 through 4094.
  14. In the Hardware Load Balancing IPs field, type the IP address for a hardware load balancing switch using Direct Server Return (DSR). This routes all client traffic to the cluster through the switch. The switch determines which node handles the traffic for the client, and passes the traffic to that node.
  15. Click Remove IP to remove a hardware load balancing IP.
  16. Click Add Subnet.