
Configuring airflow direction on WWN cards
All fan and power supply assemblies installed in the chassis must provide the same airflow direction, either nonport-side intake (NPI) or
nonport-side exhaust (NPE). In a factory-configured system, this airflow direction will match the airflow direction configured for the
chassis on the installed WWN cards.
A mismatch of between system and fan and power supply airflow direction may occur when installing new WWN cards into an existing
chassis with fan and power supply assemblies already installed or when installing fan and power supply assemblies into a replacement
chassis. Replacement chassis are shipped with new WWN cards installed, and airflow direction is not configured on these cards.
The system detects airflow direction of the chassis at system boot based on airflow direction of installed power supply and fan
assemblies. Normally, if there is a mismatch between airflow direction set on WWN cards and airflow direction of the installed fan and
power supply assemblies, the system will automatically configure the established airflow direction on the WWN cards, provided
all
installed fan and power supply assemblies have the same airflow direction. RASLOG messages such as the following will occur during
this automatic configuration:
...[HIL-1630], 449, SLOT 1 CHASSIS, INFO, chassis1, Auto-configuring
system airflow direction to Non-portside Exhaust
[HIL-1630], 449, SLOT 1 CHASSIS, INFO, chassis1, Auto-configuring
system airflow direction to Non-portside Intake
If airflow direction for power supply and fan assemblies does not match, WWN cards will not automatically reconfigure and the fan or
power supply assembly with mismatched airflow will fault. In this case, you must replace fan or power supply assemblies to achieve
matching airflow direction for all, and then reboot the system.
The following procedure is provided if you need to manually synchronize airflow direction on WWN cards with airflow direction of
installed fan and power supply assemblies.
NOTE
Changing chassis airflow is only supported to synchronize established airflow direction of installed fan and power supply
assemblies with airflow direction configured on WWN cards. Changing airflow direction from NPI to NPE or NPE to NPI is not
supported in a customer environment.
1. Enter
chassisShow
to display airflow direction programmed in WWN cards and airflow direction of installed fan and power
supply FRUs.
Airflow direction of fans and power supplies displays as "Fan Direction" under each fan or power supply unit. System airflow
direction displays as "System Airflow" under the WWN card unit. The following example shows mismatch of system airflow and
airflow direction in installed fan and power supply as the WWN units should indicate "Non-portside Intake."
POWER SUPPLY Unit: 1
Power Source: AC
Fan Direction: Non-portside Intake
...
FAN Unit: 2
Fan Direction: Non-portside Intake
...
WWN Unit: 1
System AirFlow: Non-portside Exhaust
...
WWN Unit: 2
System AirFlow: Non-portside Exhaust
Configuring airflow direction on WWN cards
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