Controller connectors (with Fibre channel host port adapters)
Figure 19 shows the optional Fibre Channel host port adapter installed in both controllers at the rear of
the storage subsystem.
SAS Host Ports 1 and 2
The DCS3700 SAS host ports are each a x4 multilane, 6 Gbps universal mini-SAS port. Connect a
SAS cable from your host system SAS host bus adapter to a host port on each controller.
Fibre Channel Host Ports 3, 4, 5, and 6
Each Fibre Channel host port supports a small-form-factor pluggable (SFP) transceiver and is
capable of operating at 8 Gbps, 4 Gbps, or 2 Gbps.
Drive expansion port
The drive expansion port is a x4 multilane SAS port. Connect a SAS cable to this port and to a
drive expansion enclosure.
Enclosure ID Settings
The enclosure ID is a unique two-digit identifier for each enclosure in the storage subsystem
configuration. In a dual controller or ESM configuration, both enclosure IDs are identical under normal
operating conditions. Each DCS3700 storage system and DCS3700 expansion enclosure in the storage
subsystem configuration must have a unique storage enclosure ID.
The controller automatically sets the enclosure ID. You can change the setting through the DS Storage
Manager software, if necessary. The range of supported enclosure ID settings is 0 through 99. The
enclosure ID is normally set to a value of 00 at the factory.
The enclosure ID is displayed on the seven-segment numeric display located on the back of each
controller and ESM.
Working with SAS cables
Each storage controller has up to four x4 multilane SAS host ports and a single x4 multilane SAS port for
drive channel connections.
Figure 19. Dual-controller DS3700 storage subsystem ports and controllers (with an optional Fibre Channel host port
adapter)
42 IBM System Storage DCS3700: Installation, User, and Maintenance Guide
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