Hello BertiniB,   In theory that would be correct as defined here. You are aware of the risk if the system requires more power that it's able to supply if there is one failed PSU.    * Not Redundant - Every PSU contributes to the server's power. This can allow the server to reach its maximum possible power draw, but the lack of redundancy also means that if one PSU fails, the server can experience an outage.     I'll add more information from the iDRAC in line help  : Power Supply Options NOTE: This section is displayed only for iDRAC on Rack and Tower systems. By default, iDRAC calculates the maximum power consumption for the system and based on this information, it sets the redundancy policy. If you subsequently change the hardware configuration, the redundancy policy does not automatically update. Hot spare is a power supply feature that configures redundant Power Supply Units (PSUs) to turn off depending on the server load. This allows the remaining PSUs to operate at a higher load and efficiency. This requires PSUs that support this feature, so that it quickly powers ON when needed. In a two PSU system, you must set the primary PSU (that must be ON.) In a four PSU system, you must set the pair of PSUs (1+3 or 2+4) that must be ON. Power Factor Correction (PFC) configures the PSUs to disable the PFC when the server is powered off. In Standby Mode of PSU operation, the PSU has the ability to disable PFC circuitry through a system command. The efficiency improvement is seen as watts saved. Power factor is the ratio of real power consumed to the apparent power. When the AC load is partly capacitive or inductive, the current waveform is out of phase with the voltage. This requires additional AC current to be generated that is not consumed by the load, creating wasted I2R (W) losses in the distribution network. Therefore, to maximize the amount of capability on a specific phase, the PFC must be as close to 1 as possible. Enter the following power supply redundancy settings, and click Apply to apply the settings.   Redundancy Policy   Select the redundancy policy: • Not Redundant— In this mode, failure of a single PSU can power off the system.  • Input Power Redundant— In this mode, the system is functional in the event of failure of a PSU input circuit, provided the PSUs are connected to different input circuits. This is also called AC redundancy. • PSU Redundant— Only available on systems with four PSUs. This is also called DC redundancy. This is only valid in a 2+1 PSU configuration. In this mode, the system is functional in the event of failure of a single PSU.   Hot Spare   Select Enable to enable hot spare. If not, select Disable. Hot spare allows you to power off and power on specific power supplies as more or less power is required to operate the system.   Primary Power Supply Unit   Select the primary power supply unit. You can select this only if Hot Spare is enabled.   Power Factor Correction   Select Enable to enable power factor correction. If not, select Disable.  
Hi, I bought a used Dell R420 with dual CPU and two 350W PSUs, and I am concerned with one thing: does the Power Configuration set to "Not Redundant" sums up the power headroom? Would I have a maximum capacity of 700W? Because in the Power Monitoring, it says the Failure Threshold is 938 Watts and the Warning Threshold is set to 854 Watts.I am new to servers and can't find the answer.
Dell R420 - Not Redundant policy sums the PSUs?