Cisco Nexus 9516 Hardware Installation Manual page 65

Managing the Switch
Scenario
2
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.
For example, if the power requirement for a switch is 5.2 kW and the switch has two 3.0-kW power
supplies outputting 3.0 kW each, consider the following power planning scenarios:
The following table shows the results for each scenario.
Power Power
Requirement Supply 1
Output
5.2 kW 3.0 kW
• 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.
Power
Supply 2
Output
3.0 kW
Cisco Nexus 9516 NX-OS Mode Switch Hardware Installation Guide
Power Mode Configuration Guidelines
Available Reserve
Power Power
6.0 kW —
Result
Available
power
exceeds the
power
requirement
for the
switch, so the
entire switch
can power
up.
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