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Connecting drive cables to the controller unit
Use the following procedure to connect a redundant drive loop to the controller unit. You
will need two Fiber Channel interface cables for each redundant pair of loops (for
example, Loop A and Loop B) that you are connecting to the controller unit.
1 Connect drive Loop A to the controller unit, as shown in
Starting with the last drive enclosure in Loop A, cable the In port on the left ESM
board to the Out (upper) port on drive mini-hub 4 on the controller unit.
Leave the In port on the right ESM board on the last drive enclosure and the In (lower)
connector on drive mini-hub 4 unoccupied.
2 Connect drive Loop B to the controller unit, as shown in
Starting with the first drive enclosure in the loop, cable the Out port on the right ESM
board to the In (lower) port on drive mini-hub 3.
Leave the Out port on the left ESM board and the Out (upper) port on drive
mini-hub 3 unoccupied.
To connect a second redundant drive enclosure group to the controller unit, continue
with
Step 3 on page
unit" on page
Step 1: Connect drive Loop A
to the controller unit.
Loop A interface cables
Figure 21. Cabling redundant drive enclosure loops to the controller unit
34; otherwise, go to
35.
Out port on drive
mini-hub 4
Figure
Figure
"Connecting hosts directly to the controller
Step 2: Connect drive Loop B
to the controller unit.
Loop B interface cables
In port on drive
mini-hub 3
Chapter 2. Connecting the controller unit to the loop
21.
21.
33
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