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

Power supply unit 1 outputs 3.0 kW.

Power supply unit 2 outputs 6.0 kW.

The device power requirement is 8.784 kW.

The following three scenarios explain what happens depending on what you install for the third power supply unit:

Scenario 1: If you do not add a third power supply unit, the reserve power is 6 kW and the available power is 3 kW. The available power is insufficient for the device power requirement, so you cannot power the entire device.

Scenario 2: If you add a power supply unit that outputs 3 kW, the reserve power remains 6 kW and available power becomes 6 kW. The available power is still insufficient because it does not meet the device power requirement, so you can power more modules than you could with Scenario 1, but you still cannot power the entire device.

Scenario 3: If you add a power supply unit that outputs 7.5 kW, the reserve power becomes

7.5kW and the available power becomes 9 kW. The available power exceeds the device power requirement, so you can power up all of the modules and fan trays in the device.

Table 6-4shows the results for each scenario.

Table 6-4

Power Supply Redundancy Mode Scenarios

 

 

 

 

 

 

 

 

 

 

 

Power

Power

Power

System

Available

Reserve

 

 

Supply 1

Supply 2

Supply 3

Usage

Power

Power

 

Scenario

(kW)

(kW)

(kW)

(kW)

(kW)

(kW)

Result

 

 

 

 

 

 

 

 

1

3.0

6.0

8.784

6.0

The available power does not meet the system

 

 

 

 

 

 

 

usage requirement, so you cannot power the entire

 

 

 

 

 

 

 

system with this power supply configuration and

 

 

 

 

 

 

 

mode.

 

 

 

 

 

 

 

 

2

3.0

6.0

3.0

8.784

6.0

6.0

The available power does not meet the system

 

 

 

 

 

 

 

usage, so you cannot power the entire system with

 

 

 

 

 

 

 

this power supply configuration and mode.

 

 

 

 

 

 

 

 

3

3.0

6.0

7.5

8.784

9.0

7.5

The available power exceeds the system usage, so

 

 

 

 

 

 

 

you can power the entire system with this power

 

 

 

 

 

 

 

supply configuration and mode.

 

 

 

 

 

 

 

 

Input source redundancy mode—To activate this power mode, use the

power redundancy-mode insrc_redundant command. The reserve power is the greater of power outputs for the two grids, and the available power becomes the lesser of power outputs for the two grids.

For example, suppose your system has the following setup:

Grids 1 and 2 each input 220 V to the power supply units. Power supply units 1 and 2 each output 6 kW.

Current usage requirement is 8.784 kW.

Then the following three 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 reserve power is 6 kW (3 kW for one power supply unit and 3 kW for the other power supply unit), and the available power is 6 kW (3 kW for one power supply unit plus 3 kW for the other power supply unit). The available power does not meet the device usage requirement, so you cannot power the entire device.

 

Cisco Nexus 7000 Series Hardware Installation and Reference Guide

6-12

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Cisco Systems N6KC600164P, 7000, UCSCPCIECSC02, N7KC7004 Power System Available Reserve Supply, Usage Power Scenario Result

N6KC600164P, UCSCPCIECSC02, N7KF248XP25E, N7KF248XT25E, N7KF248XT25EP1 specifications

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