Chapter 6 Managing the Device Hardware

Power Supply Configuration Modes

Se n d d o c u m e n t c o m m e n t s t o n ex u s 7 k - d o c f e e d b a ck @ c i s c o . c o m

Note To display the current power supply configuration, use the show environment power command.

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 device modules, then this mode is sufficient for running your device.

For example, suppose your system has the following setup:

Power supply unit 1 outputs 6 kW.

The device 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 device power requirement, so the device 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 device power requirement, so all of the modules and fan trays in the device can power up.

Table 6-3shows the results for each scenario.

Table 6-3

Combined Power Mode Scenarios

 

 

 

 

 

 

 

 

Power

Power

System

Available

 

 

Supply 1

Supply 2

Usage

Power

 

Scenario

(kW)

(kW)

(kW)

(kW)

Result

 

 

 

 

 

 

1

6.0

8.784

6.0

Available power is less than system usage, so

 

 

 

 

 

you cannot power the entire system with this

 

 

 

 

 

mode.

 

 

 

 

 

 

2

6.0

3.0

8.784

9.0

Available power exceeds the system usage, so

 

 

 

 

 

you can use this mode to power your entire

 

 

 

 

 

system.

 

 

 

 

 

 

Power supply redundancy mode—To activate this power mode, use the

power redundancy-modeps-redundantcommand. The power supply unit that outputs the most power provides the reserve power, and the combined output for the other power supply units becomes the available power.

For example, suppose your system has the following setup:

 

 

Cisco Nexus 7000 Series Hardware Installation and Reference Guide

 

 

 

 

 

 

OL-18634-01

 

 

6-11

 

 

 

 

 

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Cisco Systems N7KF248XT25EP1 Power Supply Configuration Guidelines, Power System Available Supply Usage Scenario Result

N6KC600164P, UCSCPCIECSC02, N7KF248XP25E, N7KF248XT25E, N7KF248XT25EP1 specifications

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