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enclosures, use the following procedure to connect a redundant drive loop to the
DS4500 Storage Subsystem. You will need two fiber-optic cables for each
redundant pair of loops (for example, loop A and loop B) that you are connecting to
the DS4500 Storage Subsystem.
1. Connect drive loop A to the DS4500 Storage Subsystem, as shown in Figure 72.
Starting with the last (fourth) storage expansion enclosure in loop A, connect
port 1B on the ESM A board to the Out (upper) port on drive mini hub 4 on the
DS4500 Storage Subsystem.
Leave port 1A on the ESM A board on the first storage expansion enclosure and
the In (lower) port on drive mini hub 4 unoccupied.
2. Connect drive loop B to the DS4500 Storage Subsystem, as shown in Figure 73
on page 95.
Starting with the first storage expansion enclosure in the loop, connect port 1B
on the ESM B board to the In (lower) port on drive mini hub 2.
EXP810
ESM B
ESMA
EXP810
ESM B
ESMA
EXP810
ESM B
ESMA
EXP810
ESM B
ESMA
Port 1B
Port 1B
Port 1A
Port 1B
Port 1A
Port 1A
Port 1B
Port 1A
Port 1B
Port 1B
ds4500_8106
Loop B
Loop A
First storage
expansion enclosure
Second storage
expansion enclosure
Third storage
expansion enclosure
Fourth storage
expansion enclosure
Port 1A
Port 1B
Port 1A
Port 1B
Drive-side
mini hub 4
Figure 72. Connecting EXP810 drive loop A to the DS4500
94 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide