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

Scenario 2: If you add a power supply that outputs 3 kW, the reserve power is 9 kW (3 kW for three power supply units), and the available power is 6 kW (3 kW for each of two power supply units). The available power does not meet the system usage requirement, so you cannot power the entire device.

Scenario 3: If you add a power supply unit that outputs 7.5 kW, the reserve power is 9.75 kW (3 kW for two power supply units and 3.75 kW for the new power supply unit), and the available power is 9.75 kW (3 kW for two power supply units and 3.75 kW for the new power supply unit). The available power exceeds the device usage requirement, so you can power up all of the modules and fan trays in the device.

Table 6-5shows the results for each scenario.

Table 6-5

Input Source 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

6.0

6.0

-

8.784

6.0

6.0

Available power (the power supply output for either

 

 

 

 

 

 

 

grid) does not meet the system usage requirement.

 

 

 

 

 

 

 

 

2

6.0

6.0

3.0

8.784

9.0

6.0

The power supply output for one grid meets the

 

 

 

 

 

 

 

system usage requirement, but the power supply

 

 

 

 

 

 

 

output for the other grid does not meet the system

 

 

 

 

 

 

 

usage requirement.

 

 

 

 

 

 

 

 

3

6.0

6.0

7.5

8.784

9.75

9.75

The power supply output for both grids meet the

 

 

 

 

 

 

 

meet the system usage requirement.

 

 

 

 

 

 

 

 

Full redundancy mode—To activate this power mode, use the power redundancy -mode redundant command. The reserve power is the greater amount of reserve power for power supply redundancy and input source redundancy, and the available power is the lesser amount of available power for the same two redundancy modes.

For example, suppose your system has the following setup:

Grids A and B each provide 220 V.

Power supply units 1 and 2 each output 6.0 kW. Device 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 and the available power is 6 kW. The available power does not meet the device usage requirement, so you cannot power up the entire device.

Scenario 2: If you add a 3-kW power supply unit, the reserve power is 9 kW (3 kW for three power supply units on one grid), and the available power is 6 kW (3 kW for two power supply units on a second grid). The available power does not meet the device usage requirement, so you cannot power up the entire device.

Scenario 3: If you add a 6-kW power supply unit, the reserve power is 9 kW (3 kW for three power supply units on the same grid), and the available power is 9 kW (3 kW for three power supply units on a second grid). The available power meets the device usage requirements, so you can power up the entire device.

 

 

Cisco Nexus 7000 Series Hardware Installation and Reference Guide

 

 

 

 

 

 

OL-18634-01

 

 

6-13

 

 

 

 

 

Page 107
Image 107
Cisco Systems N7KC7004S2, 7000, UCSCPCIECSC02, N7KC7018RF Power System Available Reserve, Supply Usage Power Scenario Result

N6KC600164P, UCSCPCIECSC02, N7KF248XP25E, N7KF248XT25E, N7KF248XT25EP1 specifications

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