Hot Spare Feature; Removing The Power Supply Unit Blank - Dell Precision Rack 7910 Owner's Manual
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- Owner's manual (142 pages) ,
- Quick start manual (2 pages) ,
- Setup manual (3 pages)
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NOTE:
When two identical PSUs are installed, power supply redundancy (1+1 – with redundancy 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 will be put into standby when system utilization is
low in order to maximize efficiency.
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 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
About this task
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.
Figure 36. Removing and installing the power supply blank
1. power supply blank
Installing and removing system components
67
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