Changing the MTU setting

You can change the MTU setting that you assigned when you configured IP addresses for the appliance node.

Before you begin

About this task

Before changing the MTU setting, you must place the services appliance into maintenance mode. Putting a StorageGRID appliance into maintenance mode might make the appliance unavailable for remote access.

The password and host key for a StorageGRID appliance put into maintenance mode remain the same as they were when the appliance was in-service.


  1. Follow these steps to place the appliance into maintenance mode:
    1. From the Grid Manager, select Nodes.
    2. From the tree view of the Nodes page, select the appliance Storage Node.
    3. Select the Tasks tab.

      Maintenance Mode button for appliance
    4. Click Maintenance Mode.
      A confirmation dialog box appears.
      Maintenance Mode confirmation dialog box
    5. Enter the provisioning passphrase, and click OK.
      A progress bar and a series of messages, including Request Sent, Stopping StorageGRID, and Rebooting indicate that the appliance is completing the steps for entering maintenance mode.
      Maint Mode Progress Bar
      When the appliance is in maintenance mode, a confirmation message lists the URLs you can use to access the StorageGRID Appliance Installer.
      Maintenance Mode URLs
    6. Browse to any of the URLs displayed.
      Note: If possible, use the URL containing the IP address of the appliance's Admin Network port.
      Note: Accessing requires a direct connection to the local management port.
    7. Confirm that the appliance is in maintenance mode by noting the maintenance mode message on the StorageGRID Appliance Installer home page.

      maintenance mode message
  2. From the StorageGRID Appliance Installer, select Configure Networking > IP Configuration.
  3. Make the desired changes to the MTU settings for the Grid Network, Admin Network, and Client Network.

    Grid Network IP
    Attention: The MTU value of the network must match the value configured on the switch port the node is connected to. Otherwise, network performance issues or packet loss might occur.
    Attention: For the best network performance, all nodes should be configured with similar MTU values on their Grid Network interfaces. The Grid Network MTU mismatch alert is triggered if there is a significant difference in MTU settings for the Grid Network on individual nodes. The MTU values do not have to be the same for all network types.
  4. When you are satisfied with the settings, click Save.
  5. Return the appliance to normal operating mode:
    1. From the StorageGRID Appliance Installer, select Advanced > Reboot Controller.

      reboot controller
    2. Click Reboot Controller.
      During the reboot, the following screen appears:
      Reboot in Progress

      The appliance reboots and rejoins the grid. This process can take up to 20 minutes.

    3. On the Nodes page, verify that the appliance node returns to the expected status by viewing the icon to the left of the node name.
      When the reboot is complete, the Tasks tab looks like the following screenshot:
      Reboot Complete