IBM System Storage Subsystem DS5020 - Manual (Page 100)

One DS5020 and one EXP520 storage expansion enclosure
Figure 46 shows the cabling scheme for one DS5020 storage subsystem and one
EXP520 storage expansion enclosure.
Perform the following steps to create the cabling scheme shown in Figure 46:
1. Connect either port 2 or port 1 of the dual-ported drive channel 1 in controller A
on the DS5020 to port 1B on the left ESM of the EXP520.
2. Connect either port 1 or port 2 of the dual-ported drive channel 2 in controller B
on the DS5020 to port 1B on the right ESM of the EXP520.
1A 1B
DS5020
Port 2, drive channel 1
1A 1B
Port 1, drive channel 1
Port 1, drive channel 2
Port 2, drive channel 2
EXP520
Figure 46. Cabling for one DS5020 and one EXP520 storage expansion enclosure
70 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide