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NOTE: When two identical PSUs are installed, power supply redundancy (1+1 – withredundancy or
2+0 – without redundancy) is configured in system BIOS. In redundant mode, power is supplied to
the system equally from both PSUs when Hot Spare is disabled. When Hot Spare is enabled, one of
the PSUs are put into standby when system usage is low to maximize efficiency.
NOTE: If two power supply units are used, they must be of the same maximum output power.
NOTE: For AC power supply units, use only power supply units with the Extended Power
Performance (EPP) label on the back. Mixing power supply units from previous generations of
servers can result in a power supply unit mismatch condition or failure to power on.
Hot Spare feature
Your system supports the Hot Spare feature that significantly reduces the power overhead associated
with power supply redundancy.
When the Hot Spare feature is enabled, one of the redundant power supplies is switched to a sleep state.
The active power supply supports 100 percent of the load, thus operating at higher efficiency. The power
supply in the sleep state monitors output voltage of the active power supply. If the output voltage of the
active power supply drops, the power supply in the sleep state returns to an active output state.
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, 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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