Cisco Nexus 9504 Hardware Installation Manual page 66

Power Mode Configuration Guidelines
Input-source (grid or n+n) redundancy mode
Half of the 3-kW power supplies are connected to one power source (grid) and the other half are
connected to another power source. The available power is provided by one power source and the
reserve power is provided by the other power source. If the power source that provides the available
power fails, the switch uses the reserve power source to provide its required power. You activate this
power mode by using the power redundancy-mode insrc_redundant command.
For example, if the power requirement for a switch is 5.2 kW and the switch has two power supplies
that output 3 kW, consider the following power planning scenarios:
The following table shows the results for each scenario.
Scenario
1
2
Cisco Nexus 9504 NX-OS Mode Switch Hardware Installation Guide
56
• Scenario 1—No added power supplies
The available power is 3.0 kW (output from one 3-kW power supply) and the reserve power is
3.0 kW (output from the other power supply). The available power (3.0 kW) does not meet the
switch requirements (5.2 kW), so most of the modules will power up but some of the I/O modules
will not be able to power up.
• Scenario 2—Adding two 3-kW power supplies
The available power is 6.0 kW (output from two 3-kW power supplies on grid A) and the reserve
power is 6.0 kW (output from the other two power supplies on grid B). The available power (6.0
kW) exceeds the power requirement of the switch (5.2 kW), so the entire switch can power up.
Power Output for Power Supplies
Requirement
1
5.2 kW 3.0 kW
5.2 kW 3.0 kW
2 3 4
3.0 kW — —
3.0 kW 3.0 kW 3.0 kW
Managing the Switch
Available Reserve Result
Power Power
3.0 kW 3.0 kW Available power
(3.0 kW) is less
than the power
requirement for
the switch (5.2
kW), so most of
the switch can
power up but
one or more I/O
modules cannot
power up.
6.0 kW 6.0 kW Available power
(6.0 kW)
exceeds the
power
requirement for
the switch (5.2
kW), so the
entire switch can
power up.