IBM manual Connecting a redundant drive loop to the DS4500

Loop A Loop B

Storage expansion enclosure group 1

Storage server

Storage expansion enclosure group 2

Loop C Loop D

Figure 13. Connecting a second redundant storage expansion enclosure group (loops C and D)

Connecting a redundant drive loop to the DS4500

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 14 on page 14.

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.

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