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If having both PSUs active is more efficient than having one PSU in a sleep state, the active PSU can also
activate a sleeping PSU.
The default PSU settings are as follows:
• If the load on the active PSU is more than 50%, then the redundant PSU is switched to the active state.
• If the load on the active PSU falls below 20%, 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 on iDRAC
settings, see the Integrated Dell Remote Access Controller User’s Guide at dell.com/support/home.
Removing the power supply unit blank
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 blank must be installed in the
second power supply bay in a non-redundant configuration. Remove the power supply blank
only if you are installing a second power supply.
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