IBM Storwize V7000 - Power supply unit for the expansion enclosure

Each canister has two SAS ports that are numbered 1 on the left 1 and 2 on the
right 2.
Port 1 is the input port, as indicated by the arrow at 1. Port 1 must always be
connected.
Port 2 is the output port, as indicated by the arrow at 2. Port 2 is only connected
if this expansion unit is not the last one in the chain.
Note: The reference to the left and right locations applies to canister 1, which is
the upper canister. The port locations are inverted for canister 2, which is the lower
canister.
svc00668
1
1
2
2
Figure 3. SAS ports and LEDs in rear of expansion enclosure
Chapter 3. Before you begin the installation 7