Power Supply Units; Fault Tolerant Redundancy - Dell EMC PowerEdge R6400 Installation And Service Manual

Figure 23. Installing a drive into the drive carrier

Power supply units

The power supply unit (PSU) is an internal hardware component which supplies power to the components in the system.
CAUTION: The PSUs must have the Extended Power Performance (EPP) label. Mixing PSUs (even the PSUs that have the same
power rating) from previous generations of PowerEdge servers is not supported. Mixing PSUs results in a PSU mismatch
condition or failure to turn the system on.
Your system supports two 2400 W, 2000 W, or 1600 W AC PSUs.
NOTE: For more information, see the Technical specifications section.

Fault tolerant redundancy

Policy Budgeting
Fault Tolerant Redundancy is a hybrid redundancy mode which uses the power capacity limits of a single Power Supply Unit for Power
Budget Checks, similar to Grid Redundancy, but enforces added performance limiting after redundancy is lost. It is only fully supported with
FC640 modular sleds. Previous generation modular sleds will still work with Fault Tolerant Redundancy enabled, but they will treat it
identically to Grid Redundancy.
When the maximum potential power needs of installed chassis components exceeds the capacity of a single Power Supply, the Chassis
Management Controller (CMC) will deny power on to further chassis components. The Power Budget Checks for Fault Tolerant
Redundancy ensure that the PowerEdge FX2 Shared Infrastructure Chassis will remain operational in the event of maximum potential
workload conditions at the time of an AC Grid or PSU Supply failure. Using the maximum potential is a conservative target that ensures
continued operation across the wide range of potential customer workloads for a given configuration
Installing and removing enclosure components 45