Dell PowerEdge R340 EMC PowerEdge R340 Installation and Service Manual - Page 84

Power supply unit, Hot spare feature

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Figure 66. Cable routing - 8 x 2.5-inch SAS backplane with PERC Figure 67. Cable routing - 4 x 3.5-inch SAS backplane with PERC Power supply unit NOTE: For more information, see the Technical specifications section. Hot spare feature 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 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: 84 Installing and removing system components

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Figure 66. Cable routing - 8 x 2.5-inch SAS backplane with PERC
Figure 67. Cable routing - 4 x 3.5-inch SAS backplane with PERC
Power supply unit
NOTE:
For more information, see the
Technical specifications
section.
Hot spare feature
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 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:
84
Installing and removing system components