IBM SAN256B-6, Installation, Service And User Manual

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1 - WWN card 1
2 - WWN card 2
3 - WWN card bezel
4. Depending on the WWN card assembly removed, label the assembly with #1 for the left-side
assembly and #2 for the right-side assembly for future reference.
5. Set the WWN card assembly on a static-free surface, such as a grounding pad.
Configuring airflow direction on WWN cards
About this task
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
Figure 64. Removing and installing WWN cards
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SAN256B-6 Installation, Service, and User Guide