If having both power supplies active is more efficient than having one power supply in a sleep state, the
active power supply can also activate a sleeping power supply.
The default power supply settings are as follows:
• If the load on the active power supply is more than 50 percent, then the redundant power supply is
switched to the active state.
• If the load on the active power supply falls below 20 percent, then the redundant power supply is
switched to the sleep state
You can configure the Hot Spare feature 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, you must install the power supply blank 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.
81
