power fails, the reserve power supply can provide power for the switch. You activate this mode by using
the insrc-redundant command.
For example, if the switch requires 4.0 kW of power, the switch has four power supplies that each output
3 kW. If you have two power grids, you use both grid A and grid B to power four 3-kW power supplies
that provide the available power for the switch.
Combined mode
This mode allocates the combined power of all power supplies to active power for switch operations.
This mode does not allocate reserve power for power redundancy in case of power outages or power
supply failures. This mode is not recommended for production.
The amounts of available and reserve power depend on the power redundancy mode that you specify. The
amounts of available and reserve power also depends on the number of power supplies that are installed in
the switch. For each redundancy mode, consider the following:
n+1 redundancy mode
The power supply that outputs the most power provides the reserve power so that it can take over for
any other power supply that fails. All the other installed power supplies provide the available power.
You activate this power mode by using the power redundancy-mode ps-redundant command.
• Scenario 1—No added power supplies
One 3-kW power supply provides the reserve power and the other 3-kW power supply, also outputting
3.0 kW, provides the available power. The available power (3.0 kW) does not meet the switch
requirements of 5.2 kW, so the switch powers up except for some of its line cards.
• Scenario 2—Adding one 3-kW power supply
One 3-kW power supply, which outputs 3.0 kW, provides the reserve power and the other two 3-kW
power supplies, also outputting 3.0 kW each, provide enough power (6.0 kW) to meet the switch
requirements (5.2 kW), so the entire switch powers up.
The following table shows the results for each scenario.
Cisco Nexus 9504 NX-OS Mode Switch Hardware Installation Guide
65
Managing the Switch
Overview of Power Modes
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