Cisco Nexus 9504 Hardware Installation Manual page 65

Managing the Switch
Power supply (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, and all of the other installed power supplies provide the available
power. You activate this power mode by using the power redundancy-mode ps-redundant command.
The following table shows the results for each scenario.
Scenario
1
2
• 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 I/O modules.
• 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 a sufficient amount of power (6.0
kW) to meet the switch requirements (5.2 kW), so the entire switch powers up.
Power Output (kW) for Power
Requirement Supplies
1
5.2 kW 3.0 kW
5.2 kW 3.0 kW
Available
Power
2 3
3.0 kW — 3.0 kW
3.0 kW 3.0 kW 6.0 kW
Cisco Nexus 9504 NX-OS Mode Switch Hardware Installation Guide
Power Mode Configuration Guidelines
Reserve Result
Power
3.0 kW Available power is less
than the power
requirement for the
switch, so you cannot
power the entire switch
(one or two of the I/O
modules will not be
able to power up).
3.0 kW Available power
exceeds the power
requirement for the
switch, so the entire
switch can power up.
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