IBM System Storage DS5020

One DS5020 and three storage expansion enclosures
If you are cabling one DS5020 storage subsystem and three storage expansion
enclosures, Figure 40 shows the correct cabling topology.
1A
1B
DS5020
Port 2, drive channel 1
1A
1B
1A
1B
1A
1B
Port 1, drive channel 1
Port 1, drive channel 2
Port 2, drive channel 2
1A
1B
1A
1B
Figure 40. Cabling for one DS5020 and three storage expansion enclosures
64 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide