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 system 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 of PSU rated power wattage,
then the redundant PSU is switched to the active state.
If the load
on the active PSU falls below 20 percent of PSU rated power wattage,
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, see the iDRAC User’s Guide available
at Dell.com/idracmanuals.
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