IBM manual Connecting a redundant drive loop to the DS4500

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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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Contents
Using IBM SFP modules and IBM fibre channel cables Removing an SFP module and fibre channel cable Installing an SFP module and fibre channel cableHost mini hubs Drive mini hubs Controller a Direct-attached host-side fibre channel cablingHost Host 2, Host Adapter 1 Host 3, Host Adapter 1 Drive-side fibre-channel cablingDrive mini-hub ports Drive interface portsOverview Cabling a DS4500 with four drive mini hubs Redundant drive loop cabling overview four mini hubs Overview Cabling a DS4500 with two drive mini hubs Cables Input Output Input Configuring the drive loops Storage expansion enclosure Out ESM board Loop B Fibre Channel cable Out ESM board Connecting a redundant drive loop to the DS4500 Connecting drive loop a to the DS4500 Storage Subsystem Connecting two redundant storage expansion enclosure groups Trademarks