d. Connect drive port 4 (drive channel 1) of controller A to the to the 1B port on
the left ESM board of the first storage expansion enclosure in the group of
drive expansion enclosures. (See callout 1 in Figure 46.)
Figure 46. Connecting EXP810 enclosures to DS4800
66 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide