11. Exit the System Setup.
Power supply unit
NOTE:
section.
Hot spare feature
Your system supports the hot spare feature that significantly reduces the power overhead associated with 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 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, then the redundant PSU is switched to the active state.
•
If the load on the active PSU falls below 20 percent, 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 about iDRAC settings, see the
Integrated Dell
Remote Access Controller User’s Guide
available at
.
Removing a power supply unit blank
Prerequisites
Follow the safety guidelines listed in
Steps
If you are installing a second power supply unit, remove the power supply unit blank in the bay by pulling the blank outward.
CAUTION:
To ensure proper system cooling, the power supply unit blank must be installed in the second power supply
unit bay in a non-redundant configuration. Remove the power supply unit blank only if you are installing a second power
supply unit.
Figure 101. Removing a power supply unit blank
Next steps
Replace a power supply unit blank
.
Installing a power supply unit blank
Prerequisites
1. Follow the safety guidelines listed in
NOTE:
If the system is using only one PSU, the PSU must be installed in PSU bay 1 and the PSU blank must be
installed in PSU bay 2.
Installing and removing system components
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