User's Guide

1. Installing Internal Optional Devices
Express5800/R120d-2E User’s Guide
113
Chapter 2 Preparations
1.22
Power Supply Unit
Your server can contain two power supply unit (one is factory-installed, and another is optional). The server
equipped with two hot-swap power supply units provides a redundant power configuration that ensures
continued operation of the system in the unlikely event one of the power supply units fails.
You can select a power supply unit appropriate your system configuration. See the table below.
Model (Installed CPU)
Number of
CPUs
Additional HDD
cage
Available power
supply unit
Not installed 450/800 W
1 CPU
Installed 800 W
16x 2.5-inch hard disk drive
model
2 CPUs – 800 W
26x 2.5-inch hard disk drive
model
3.5-inch hard disk drive
model
– – 800 W
1.22.1
Cold Redundant Feature
The server supports the feature to optimize power efficiency as described below:
 Cold redundant feature can run the system with optimum power efficiency by raising operating efficiency
of primary power supply unit and lowering that of redundant power supply unit in redundant power
configuration.
 If power efficiency of power units is not optimized due to system configuration, this feature is disabled
automaticlly.
Cold redundant feature can be used under the following conditions:
 Two power supply units must be installed for redundant configuration.
 Refer to Chapter 2 (1. System BIOS) in "Maintenance Guide", change parameters as shown below, save
the settings and exit from SETUP.
Server  Power Control Configuration  Cold Redundant Mode  Enabled
Run SETUP again, and check if the status of Cold Redundant Mode shows Enabled in Server menu.