Power Supply Unit; Hot Spare Feature; Removing A Power Supply Unit Blank - Dell EMC PowerEdge XR11 Installation And Service Manual

Figure 82. Installing the internal USB key
Next steps
1. Follow the procedure listed in
2. While booting, press F2 to enter System Setup and verify that the system detects the USB memory key.

Power supply unit

NOTE: While replacing the hot swappable PSU, after next server boot; the new PSU automatically updates to the same
firmware and configuration of the replaced one. For more information about the Part replacement configuration, see the
Lifecycle Controller User's Guide at

Hot spare feature

Your system supports the hot spare feature that significantly reduces the power overhead associated with the power supply
unit (PSU) redundancy.
When the hot spare feature is enabled, one of the redundant PSUs is switched to the sleep state. The active PSU supports 100
percent of the system load, thus operating at higher efficiency. The PSU in the sleep state monitors output voltage of the active
PSU. If the output voltage of the active PSU drops, the PSU in the sleep state returns to an active output state.
If having both PSUs active is more efficient than having one PSU in the sleep state, the active PSU can also activate the
sleeping PSU.
The default PSU settings are as follows:
● If the load on the active PSU is more than 50 percent of PSU rated power wattage, then the redundant PSU is switched to
the active state.
● If the load on the active PSU falls below 20 percent of PSU rated power wattage, then the redundant PSU is switched to
the sleep state.
You can configure the hot spare feature by using the iDRAC settings. For more information, see the iDRAC User's Guide
available at www.dell.com/poweredgemanuals.

Removing a power supply unit blank

Prerequisites
1. Follow the safety guidelines listed in the
2. Follow the procedure listed in the
NOTE: The procedure to remove the power supply unit blank is the same for Rear Accessed and Front Accessed
configurations.
After working inside your
https://www.dell.com/idracmanuals
Safety instructions.
Before working inside your
system.
system.
Installing and removing system components 85