Figure 70. Installing the front PERC riser
Next steps
1. Install the expansion card riser(if removed).
2. Install the air shroud.
3. Follow the procedure listed in After working inside your system.
Power supply units
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:
● If the load on the active PSU is more than 50 percent, then the redundant PSU is switched to the active state.
● If the load on the active PSU falls below 20 percent, 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 available at https://www.dell.com/idracmanuals.
Removing a power supply unit blank
Prerequisites
1. Follow the safety guidelines listed in Safety instructions.
2. Follow the procedure listed in Before working on your system.
98
Installing and removing system components
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