1. Installing Internal Optional DevicesExpress5800/R120d-2E User’s Guide 113Chapter 2 Preparations1.22 Power Supply UnitYour server can contain two power supply unit (one is factory-installed, and another is optional). The serverequipped with two hot-swap power supply units provides a redundant power configuration that ensurescontinued 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 ofCPUsAdditional HDDcageAvailable powersupply unitNot installed 450/800 W1 CPUInstalled 800 W16x 2.5-inch hard disk drivemodel2 CPUs – 800 W26x 2.5-inch hard disk drivemodel3.5-inch hard disk drivemodel– – 800 W1.22.1 Cold Redundant FeatureThe 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 efficiencyof primary power supply unit and lowering that of redundant power supply unit in redundant powerconfiguration. If power efficiency of power units is not optimized due to system configuration, this feature is disabledautomaticlly.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, savethe settings and exit from SETUP.Server Power Control Configuration Cold Redundant Mode EnabledRun SETUP again, and check if the status of Cold Redundant Mode shows Enabled in Server menu.
