Find the Model Number of an Array or Expansion Shelf Using the GUI Do one of the following in the GUI: For version 3.x or earlier, choose Manage → Arrays. For version 4.x or later, click Hardware. Click the link of the array you want. For version 3.x or earlier, look for the model number (just below HEAD SHELF). For version 4.x or later, look in the Properties section for the model number.