This message occurs when the Data ONTAP module that is responsible for monitoring the health of the universal serial bus (USB) boot devices is disabled.
Corrective action
Halt the system by entering the following command at the system prompt:halt
After the system boots to the LOADER prompt, run the setenv disable-usbmon? false command at the LOADER prompt.
Continue to boot the system by entering the following command at the LOADER prompt:boot_ontap