Dell PowerEdge T550 EMC Installation and Service Manual - Page 156

Power supply unit, Hot spare feature

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Figure 162. Installing the intrusion switch module Next steps 1. Install the air shroud. 2. Follow the procedure listed in After working inside your system. Power supply unit NOTE: While replacing the hot swappable PSU, after next server boot; the new PSU automatically updates to the same firmware and configuration of the replaced one. For updating to the latest firmware and changing the configuration, see the Lifecycle Controller User's Guide at https://www.dell.com/idracmanuals. 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. 156 Installing and removing system components

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Figure 162. Installing the intrusion switch module
Next steps
1.
Install the air shroud
.
2.
Follow the procedure listed in
After working inside your system
.
Power supply unit
NOTE:
While replacing the hot swappable PSU, after next server boot; the new PSU automatically updates to the same
firmware and configuration of the replaced one. For updating to the latest firmware and changing the configuration, see the
Lifecycle Controller User's Guide
at
.
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
.
156
Installing and removing system components