IBM e Server i Series Setting Up page 16

Your new expansion unit may have disk units. To ensure continued access to your disk units in the event
of a link failure, a redundant link should be planned for your cable layout.
Refer to Figure 1 to see how to plan your cables with a redundant link configuration with one expansion
unit. If you are linking two expansion units, refer to Figure 2. If you are setting up stacked expansion
units, refer to Figure 3 on page 5.
Figure 1. Planning for redundant link one expansion unit
Figure 2. Planning for redundant link with two expansion units
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Setting up your 0588, 0595, 5088, 5094, 5095 or 5294 Expansion Unit V5R3