Cisco Nexus 9508 NX-OS Hardware Installation Manual page 79

Managing the Switch
Scenario
2
For grid redundancy mode, the power supplies must be divided into two equal sets and installed as follows:
• Slots that are labeled as PS 1 to PS 4 must be connected to one grid (Grid A)
• Slots that are labeled as PS 5 to PS 8 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:
The following table shows the results for each scenario.
Power Output (kW) for Power Supplies
Requirement
1
5.2 kW 3.0 kW
• 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 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.
2 3
3.0 kW 3.0 kW
Cisco Nexus 9508 NX-OS Mode Switch Hardware Installation Guide
Overview of Power Modes
Available Reserve Result
Power Power
6.0 kW 3.0 kW Available
power
exceeds the
power
requirement
for the
switch, so
the entire
switch can
power up.
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