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Leave port 1A on the ESM B of the last (fourth) storage expansion enclosure in
the loop and port 1A on the ESM A of the first storage expansion enclosure
unoccupied.
If you want to connect a second storage expansion enclosure group, repeat
Step 1 on page 90 through Step 3 on page 91. Otherwise, go to “Connecting
the redundant EXP810 drive loop to the DS4500” on page 93. Figure 71 on
page 93 shows a second redundant storage expansion enclosure group (loop C
and loop D on storage expansion enclosure group 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_8104
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
Figure 70. Connecting additional EXP810 storage expansion enclosures to drive loops A and
B
92 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide