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3 - Status LED
4 - Airflow label
5 - Air vent
6 - Handle
7- Captive screw
Fan and power supply airflow
All fans and power supply FRUs installed in this device must have either NPI (nonport-side intake) or
NPE (nonport-side exhaust) airflow. You must order a replacement FRU with the same part number
(P/N) as the FRU being replaced to provide the same airflow. The manufacturing P/N, located on the
top of the FRU, contains either NPI or NPE. If a mismatched power source or fan assembly is installed by
mistake, a RASlog message occurs indicating that a mismatch in fan or power supply airflow has
occurred and the FRU is faulted.
Note: If airflow direction for a power supply assembly does not match the chassis airflow direction as
stored on WWN cards, the power supply will have a "fault" status. However, LED operation for the
power supply will not indicate a fault. If airflow direction for a fan assembly does not match the chassis
airflow direction, the fan LED will indicate a fault condition.
You can use external labels as a guide. The power supply and fan assemblies are labeled with a green "E"
or orange "I" airflow symbol on the faceplate. The symbol also appears on the top of the FRU. All fans
and power supplies in a chassis must have the same label affixed to guarantee airflow direction is
consistent.
Figure 71. Airflow labels
The orange I symbol indicates an intake FRU. This unit pulls air in from the nonport side of the device
and exhausts it out the port side. This is called back-to-front airflow or intake airflow. This symbol
should appear on FRUs with part numbers that contain an NPI.
The green E symbol indicates an exhaust FRU. This unit pulls air in from the port side of the device and
exhausts it out the nonport side. This is called front-to-back airflow or exhaust airflow. This symbol
should appear on FRUs with part numbers that contain an NPE.
Ensure airflow direction of power supply and fan assemblies match airflow direction of the chassis
configured on installed WWN cards. If power supply or fan air flow direction does not match, the FRU
will fault. Faulty fans can cause increase in temperature.
Airflow direction can be verified by entering the chassisShow command. Following is an example from
command output indicating mis-matching airflow. WWN units should indicate "Non-portside Intake".
POWER SUPPLY Unit: 1
Power Source:
Fan Direction:
...
FAN Unit: 2
Fan Direction:
...
WWN Unit: 1
172
SAN256B-6 Installation, Service, and User Guide
AC
Non-portside Intake
Non-portside Intake
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