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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 PSUs is switched to the sleep state. The
active PSU supports 100% 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%, 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 about iDRAC
settings, see the Integrated Dell Remote Access Controller User’s Guide at Dell.com/idracmanuals.
Removing the power supply unit blank
If you are installing a second power supply unit (PSU), remove the PSU 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 PSU bay in a non-redundant configuration. Remove the PSU blank only if you are
installing a second PSU.
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