Power Supply Units; Hot Spare Feature - Dell DSS 1510 Owner's Manual

Next steps
1. If removed, reinstall the PCIe expansion card riser.
2. If disconnected, reconnect the cables to the expansion card(s).
3. Reinstall the cooling shroud.
4. If required, open the expansion card latch on the cooling shroud to support the full length expansion card.
5. Follow the procedure listed in the After working inside your system section.
6. While booting, press F2 to enter System Setup and check that the processor information matches the new system configuration.
7. Run system diagnostics to verify that the new processor operates correctly.
Related tasks
Before working inside your system
Installing a processor
Installing the expansion card riser
Installing the cooling shroud
After working inside your system
Removing a heat sink
Related reference
Safety instructions
System Setup

Power supply units

Your system supports the following power supply units (PSUs):
• 450 W AC (non-redundant)
• 550 W AC (redundant)
When two identical PSUs are installed, the power supply configuration is redundant (1 + 1). In redundant mode, power is supplied to the
system equally from both PSUs to maximize efficiency.
When only one PSU is installed, the power supply configuration is non-redundant (1 + 0). Power is supplied to the system only by the
single PSU.
NOTE: If two PSUs are used, they must be of the same type and have the same maximum output power.
NOTE: For AC PSUs, use only PSU with the Extended Power Performance (EPP) label on the back. Mixing PSUs from
previous generations of Dell servers can result in a PSU mismatch condition or failure to turn on.

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 Dell.com/idracmanuals.
94 Installing and removing system components