Cisco Nexus 9504 - Page 77

requirements (5.2 kW), so most of the modules power up but some of the line cards 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.
The following table shows the results for each scenario.
ResultReserve
Power
Available
Power
Output for Power SuppliesPower
Requirement
Scenario
4321
Available
power
(3.0 kW)
is less
than the
power
requirement
for the
switch
(5.2
kW)—switch
powers up
but some
of the line
cards
cannot
power up.
3.0 kW3.0 kW——3.0 kW3.0 kW5.2 kW1
Available
power
(6.0 kW)
exceeds
the power
requirement
for the
switch
(5.2
kW)—entire
switch
powers
up.
6.0 kW6.0 kW3.0 kW3.0 kW3.0 kW3.0 kW5.2 kW2
Combined mode
The Total Power Capacity equals the combined output of all installed power supplies. There is no reserve
power. You activate this mode by using the power redundancy-mode combined command. If the Total
Power Allocated (budget) for a switch is 5.2 kW and the switch has one 3-kW power supply with 220-V
input and 3.0-kW output, consider the following power planning scenarios:
• Scenario 1—No added power supplies
Cisco Nexus 9504 NX-OS Mode Switch Hardware Installation Guide
67
Managing the Switch
Overview of Power Modes