How do I change a LUN's controller assignment?

You may have added a second controller, or for some other reason, you want to move a LUN's assignment

from one controller to the other.  First, be certain you actually have two controllers.  Then, connect to your ActiveRAID via the CLI application:

activeadmin -d <IP address of the ActiveRAID>

Then, you'll need to run these example commands replacing the LUN number, array name, and port numbers to the appropriate ones.

lun delete --lun 0 --array "Data" --port B1,B2

This will clear the current lun mappings for this array.

array assign "Data" A

This will re-assign this array over to controller A.

finally:

lun create --lun 1 --array "Data" --port A1,A2