Cisco Nexus 7710 - Page 87

The available power is 2.9 kW (output from two 3-kW power supplies on grid A) and the reserve
power is 2.9 kW (output from the other two power supplies on grid B). The available power (2.9
kW) exceeds the power requirement of the switch (2.8 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),
so most of
the switch
can power
up but
one or
more I/O
modules
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),
so the
entire
switch
can power
up.
6.0 kW6.0 kW3.0 kW3.0 kW3.0 kW3.0 kW5.2 kW2
Full redundancy mode
Full redundancy provides both power-supply redundancy and input-source redundancy. For power-supply
redundancy, the power supply with the most output provides reserve power and the other power supplies
provide the available power. For input-source redundancy, the available power is provided by one power
source and the reserve power is provided by another power source ,with half of the 3-kW power supplies
powered by one source and the other half powered by the other source. You activate this power mode
by using the power redundancy-mode redundant command.
Cisco Nexus 7710 Switch Site Preparation and Hardware Installation Guide
75OL-30452-01.
Managing the Switch
Guidelines for Configuring Power Redundancy Modes