I inherited a FAS3220 that is currently powered off and not wired to three DS4242 disk shelves. I looked at https://library.netapp.com/ecm/ecm_download_file/ECMP1213632 for the wiring but did not find the layout for the hardware I have. I have one controller of the type in section A on page 3 in the document in the URL. That section A shows the wiring for two controllers. Can I set up the FAS3220 with just one controller and the three disk shelves ? Or do I really miss a controller ? If the setup with one controller is OK (I know, no HA here), does anyone have a pointer to a wiring diagram ?