Cisco Nexus 9504 - Page 76

ResultReserve
Power
Available
Power
Output (kW) for Power SuppliesPower
Requirement
Scenario
321
Available
power is
less than
the power
requirement
for the
switch.
You cannot
power the
entire
switch
(some of
the line
cards will
not be able
to power
up).
3.0 kW3.0 kW—3.0 kW3.0 kW5.2 kW1
Available
power
exceeds the
power
requirement
for the
switch, so
the entire
switch can
power up.
3.0 kW6.0 kW3.0 kW3.0 kW3.0 kW5.2 kW2
For grid redundancy mode, the power supplies must be divided into two equal sets and installed as follows:
• Slots PS 1 and PS 2 must be connected to one grid (Grid A)
• Slots PS 3 and PS 4 must be connected to another grid (Grid B)
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:
• 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
Cisco Nexus 9504 NX-OS Mode Switch Hardware Installation Guide
66
Managing the Switch
Overview of Power Modes