The UCS 5108 blade chassis comes with an option of up to four power supply units. Each power supply is a single-phase unit and provides 2500 Watts. Depending on the total number of power supplies in the chassis and input power sources, UCS 5108 can be configured in three modes.
In a non-redundant configuration, power supplies installed in the system provide adequate power. A power supply failure results in a chassis failure. Load is evenly distributed among power supplies; however, there is no power redundancy.
In N+1 redundant mode, at least one extra power supply is available in the system in addition to the power supplies that are providing the required power for the chassis to be operational. The extra power supply is in standby mode, and load is evenly distributed among operational power supplies. In case of a single power-supply failure, standby power will replace the failed power supply on the fly.