Cisco Nexus 7000 Series - Power Supply Configuration Guidelines

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7-13
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
OL-23069-06
Chapter 7 Managing the Switch Hardware
Power Supply Configuration Modes
DETAILED STEPS
Note To d ispla y t he cu rrent pow e r supply co n f i gu rati on , use th e show environment pow er com man d.
Power Supply Configuration Guidelines
Follow these guidelines when configuring power supply units:
• When power supply units with different capacities are installed in the switch, the amount of
available power differs based on one of the following configuration modes:
– Combined mode—To activate this mode, use the power redundancy-mode combined
command. If the combined power provided by all of the installed power supply units meets the
power requirements of all of the switch modules, then this mode is sufficient for running your
switch.
For example, suppose your system has the following setup:
Power supply unit 1 outputs 6 kW.
The switch power requirement is 8.784 kW.
The following two scenarios explain what happens for different numbers of power supply units
that you install:
Scenario 1: If you do not add a power supply unit, the available power (6 kW) is insufficient for
the switch power requirement, so the switch powers the supervisor modules, fabric modules,
and fan trays, before powering as many I/O modules as the remaining available power can
support (one or more I/O modules might not be powered).
Scenario 2: If you install an additional power supply unit that can output 3 kW, the available
power becomes 9.0 kW. The increased amount of available power exceeds the switch power
requirement, so all of the modules and fan trays in the switch can power up.
Table 7-3 shows the results for each scenario.
Command Purpose
Step 1
config t
Example:
switch# config t
switch(config)#
Enters configuration mode.
Step 2
power redundancy-mode mode
Example:
switch(config)# power redundancy-mode
redundant
switch(config)#
Configures one of the following power supply modes:
• For combined mode, use the combined keyword.
• For power supply redundancy, use the
ps-redundant keyword.
• For input source redundancy, use the
insrc-redundant keyword.
• For full redundancy, use the redundant keyword.