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Chapter 3. Cabling the storage subsystem
After the storage subsystem is installed in its permanent location, you must cable it
to hosts, drives, and other external devices, depending on your hardware
configuration.
This chapter addresses the following cabling and configuration topics:
v “Enclosure ID settings ”
v “Fibre-channel loop and ID settings” on page 56
v “Working with SFPs and fiber-optic cables” on page 56
v “Connecting storage expansion enclosures to the DS4700 Express” on page 68
v “Intermixing storage expansion enclosures in the same drive loop” on page 99
v “Connecting hosts to the DS4700 Express” on page 104
v “Connecting secondary interface cables” on page 100
v “Configuring the storage subsystem” on page 101
v “Installing the storage subsystem configuration” on page 110
v “Cabling the ac power supply for ac models” on page 111
v “Cabling the dc power supply for dc models” on page 111
Enclosure ID settings
The enclosure ID, comprised of two seven-segment numbers, is located on the
back of each controller next to the indicator lights. It provides a unique identifier for
each enclosure in the DS4000 storage subsystem configuration.
The controller automatically sets the enclosure ID number. You can change the
setting through the storage management software if necessary. Both controller
enclosure ID numbers are identical under normal operating conditions. Each
storage expansion enclosure (including the DS4700 Express Storage Subsystem) in
the DS4000 storage subsystem configuration must have a unique storage enclosure
ID. In addition, the single digits (x1) of the enclosure IDs of all storage expansion
enclosures (including the DS4700 Express Storage Subsystem) in the redundant
drive channel/loop pair must be unique.
The allowable ranges for enclosure ID settings are 0-99. However, IBM
recommends that you do not set the enclosure ID to 00 or any number less than
80. The DS4700 Express enclosure ID is normally set to a value of 85 at the
factory.
Figure 32 on page 56 shows the enclosure ID on models 70 and 72.
© Copyright IBM Corp. 2010 55