Some information to note:
• The green E symbol indicates an exhaust unit. This unit pulls air in from the port-side of the switch and
exhausts it out the nonport side. This is also called front-to-back airflow or forward airflow. This symbol
should appear on FRUs with part numbers ending with -F.
• The orange I symbol indicates an intake unit. This unit pulls air in from the nonport side of the switch
and exhausts it out the port-side. This is also called back-to-front airflow or reverse airflow. This
symbol should appear on FRUs with part numbers ending with -R.
• The chassisShow command will indicate either forward or reverse airflow.
• If one fan fails, the remaining fans go to high speed to maintain proper cooling until the failed fan is
replaced.
• If a mismatched power supply or fan assembly is installed by mistake, a critical error message is sent
to the console. The message will be similar to the following:
CRITICAL HIL-1611 MISMATCH in PSU/FAN Air Flow direction. Replace PSU with
fan air flows in same direction. System will be shut down in 2 minutes.
Replacing a power supply
Replacing a power supply in the StoreFabric SN6500B 16Gb FC Switch or the StoreFabric SN4000B
SAN Extension Switch should require less than two minutes to complete.
The new power supply must have the same part number and airflow indicator as the power supply you
are replacing. See Figure 39: HPE StoreFabric SN6500B 16Gb FC Switch power supply on page
66, Figure 40: HPE StoreFabric SN4000B SAN Extension Switch power supply on page 66, and
Figure 41: HPE StoreFabric SN4000B SAN Extension Switch airflow labels on page 67 for the
power supply details and the location of the airflow labels.
NOTE:
Hewlett Packard Enterprise only supports the port side exhaust power supply.
Replacing a power supply 65
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