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Assigning an array LUN to a system and creating the root volume

For each Data ONTAP system that you want to use array LUNs, you must assign an array LUN to it and create its root volume before you can install Data ONTAP.

About this task

At this point it is easiest if you assign only one array LUN to each Data ONTAP system that you want to use array LUNs. You can add additional array LUNs after you install Data ONTAP and verify your configuration.

For Data ONTAP 8.x, the root volume must be a FlexVol volume. You should assign only one array LUN to the aggregate with the root volume. The FlexVol volume can then use all of the space for the root volume.


  1. Return to the Data ONTAP system console.
    The system should still be in Maintenance mode.
  2. Enter the following command to confirm that you can see the array LUNs created by the storage administrator: disk show -v
    If you do not see the array LUNs, reboot the system into Maintenance mode, and then double-check that the array LUNs exist, that the host groups were created correctly, that zoning is correct, and that cabling is correct.
  3. Enter the following command to assign the first array LUN to the Data ONTAP system: disk assign {disk_name}
    For example, on Data ONTAP system 1, enter disk assign L1, and on Data ONTAP system 2, enter disk assign L2.
    Note: For Data ONTAP 8.1.1 and later, advanced zoned checksum type (AZCS) is available but BCS type is recommended.
  4. Confirm that the system ID of the Data ONTAP system is shown as the owner of the array LUN: disk show -v
    If the system ID of a Data ONTAP system is shown, the array LUN was assigned to the system.
  5. Exit Maintenance mode: halt
  6. At the boot environment prompt, enter the following command: bye
  7. Press Ctrl-c to interrupt the boot process and to display the boot options menu.
  8. Select the Clean configuration and initialize all disks option to create the root volume with one of the array LUNs that you assigned to thissystem.
  9. Enter y when the system prompts you for whether you want to install a new file system.
  10. Enter y when the system displays the This will erase all the data on the disks, are you sure? message.
    The system creates a FlexVol root volume named vol0 in an aggregate named aggr0 (the system automatically creates the aggregate). After these are created on one of the assigned array LUNs, the system prompts for setup information.