Airflow Requirements - Cisco Nexus 9372PX Hardware Installation Manual
Nx-os-mode switches
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Also See for Nexus 9372PX:
- Hardware installation manual (62 pages) ,
- Configuration manual (11 pages)
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Airflow Requirements
• Two 650-W AC power supplies
• Two 930-W DC power supplies
• Any combination of the above power supplies
Note
For n+1 redundancy, you must provide power to both power supplies. For n+n redundancy, you must
provide power to both power supplies and each power supply must be connected to a different power
source.
The power supplies are rated to output up to 650 W (AC power supplies), up to 1200 W (HVAC/HVDC power
supplies), or up to 930 W (DC power supplies), but the switch requires less than those amounts of power from
the power supply. To operate the switch you must provision enough power from the power source to cover
the requirements of both the switch and a power supply. Typically, this switch and a power supply require
about 210 W of power input from the power source, but you must provision as much as 537 W power input
from the power source to cover peak demand.
To minimize the possibility of circuit failure, make sure that each power-source circuit used by the switch is
dedicated to the switch.
For the AC power cables that you can use with this switch, see
Note
For DC power cables, the recommended wire gauge is 8 AWG and the minimum wire gauge is 10 AWG.
Airflow Requirements
The switch is designed to be positioned with its ports in either the front or the rear of the rack depending on
your cabling and maintenance requirements. Depending on which side of the switch faces the cold aisle, you
must have fan and power supply modules that move the coolant air from the cold aisle to the hot aisle in one
of the following ways:
• Port-side exhaust airflow—Coolant air enters the chassis through the fan and power supply modules in
• Port-side intake airflow—Coolant air enters the chassis through the port end in the cold aisle and exhausts
• Dual-direction airflow—airflow direction is determined by the airflow direction of the installed fan
You can identify the airflow direction of each fan and power supply module by its coloring as follows:
• Blue coloring indicates port-side exhaust airflow.
• Burgundy coloring indicates port-side intake airflow.
• Gray coloring on DC power supplies indicates port-side exhaust airflow.
• Green coloring on DC power supplies indicates port-side intake airflow.
• White coloring on HVAC/HVDC power supplies indicates dual-direction airflow.
Cisco Nexus 9372PX and 9372PX-E NX-OS-Mode Switches Hardware Installation Guide
8
the cold aisle and exhausts through the port end of the chassis in the hot aisle.
through the fan and power supply modules in the hot aisle.
modules.
Preparing the Site
Power Cord Specifications, on page
45.
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