Dell PowerEdge R750xa EMC Installation and Service Manual - Page 148

Hot spare feature, Removing a power supply unit blank, Installing a power supply unit blank

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Hot spare feature Your system supports the hot spare feature that significantly reduces the power overhead associated with the 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 www.dell.com/poweredgemanuals. Removing a power supply unit blank Prerequisites Follow the safety guidelines listed in the Safety instructions. Steps Pull the blank out of the system. CAUTION: To ensure proper system cooling, the PSU 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. Figure 159. Removing a power supply unit blank Next steps 1. Replace the PSU blank or install the PSU. Installing a power supply unit blank Prerequisites 1. Follow the safety guidelines listed in the Safety instructions. NOTE: Install the power supply unit (PSU) blank only in the second PSU bay. 2. If required, Remove the PSU. 148 Installing and removing system components

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Hot spare feature
Your system supports the hot spare feature that significantly reduces the power overhead associated with the 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
www.dell.com/poweredgemanuals
.
Removing a power supply unit blank
Prerequisites
Follow the safety guidelines listed in the
Safety instructions
.
Steps
Pull the blank out of the system.
CAUTION:
To ensure proper system cooling, the PSU 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.
Figure 159. Removing a power supply unit blank
Next steps
1.
Replace the PSU blank
or
install the PSU
.
Installing a power supply unit blank
Prerequisites
1.
Follow the safety guidelines listed in the
Safety instructions
.
NOTE:
Install the power supply unit (PSU) blank only in the second PSU bay.
2.
If required,
Remove the PSU
.
148
Installing and removing system components