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Guidelines for Configuring Power Redundancy Modes
Scenario
1
2
Input-source (grid) 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 providing 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, the switch uses two 220-V power sources,
and the switch has two 3-kW power supplies (each outputting 3.0 kW when using 220-V power sources),
consider the following power planning scenarios:
• Scenario 1—no added power supplies
• Scenario 2—adding two 3-kW power supplies
Cisco Nexus 7710 Switch Site Preparation and Hardware Installation Guide
74
Power
Output (kW) for Power Supplies
Requirement
1
5.2 kW
3.0 kW
5.2 kW
3.0 kW
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.
Available
Power
2
3
3.0 kW
—
3.0 kW
3.0 kW
3.0 kW
6.0 kW
Managing the Switch
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.
OL-30452-01.
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