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Connecting the redundant EXP500, EXP100, EXP700, or EXP710 drive loop to
the DS4500: After you configure the redundant drive loop using the EXP500,
EXP100, EXP700, or EXP710 storage expansion 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 64.
Starting with the last storage expansion enclosure in loop A, connect the In port
on the left ESM board to the Out (upper) port on drive mini hub 4 on the
DS4500 Storage Subsystem.
Leave the Out port on the left ESM board on the first storage expansion
enclosure and the In (lower) connector on drive mini hub 4 unoccupied.
2. Connect drive loop B to the DS4500 Storage Subsystem, as shown in Figure 65
on page 87.
First storage
expansion enclosure
Third storage
expansion enclosure
Right ESMLeft ESM
Out
Out
In
d3nu4043d
Right ESMLeft ESM
Out
Out
In
Second storage
expansion enclosure
Right ESMLeft ESM
EXP500/100/7x0
In
In
Out
Out
In
Right ESMLeft ESM
Out
Out
In
Fourth (last) storage
expansion enclosure
In
In
EXP500/100/7x0
EXP500/100/7x0
EXP500/100/7x0
LoopA Loop B
Drive-side
mini hub 4
Figure 64. Connecting EXP500, EXP100, EXP700, or EXP710 drive loop A to the DS4500
86 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide