Introduction
3
1.3 The Plug-in Modules
The IBM System Storage DCS9900 3S2 Storage Expansion Unit requires the following modules for
normal operation:
• 2 x Power Supply/Cooling modules
• 2 x EBOD modules
• Up to 16 SAS drive carrier modules and/or dummy drive carrier modules, as required.
Note
No drive bays should be left completely empty.
1.3.1 AC PSU/Cooling Module
Two (2) auto ranging AC 450W PSU/Cooling modules are supplied mounted in the rear of the enclosure
as part of the subsystem core product.
The PSU voltage operating ranges are nominally 115V or 230V AC, selected automatically. Four LEDs
mounted on the front panel of the Power Supply/Cooling module (
) indicate the status of the
PSU and the fans.
1.3.1.1
Multiple Power Supply/Cooling Modules
The IBM System Storage DCS9900 3S2 Storage Expansion Unit must always be operated with two
Power Supply (PSU)/Cooling modules fitted. The two PSU/Cooling modules operate together so that if
one fails the other maintains the power supply and cooling while you replace the faulty unit.
Module replacement should only take a few minutes to perform but must be completed within 10 minutes
from removal of the failed module.
Figure 1–3
AC Power Supply/Cooling Module
(reverse orientation at installation)
