Brocade 6520 Hardware Reference Manual - Manual (Page 40)

28 Brocade 6520 Hardware Reference Manual
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Power supply removal and replacement
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FIGURE 8 Examples of airflow symbols
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 non-port 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 non-port 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 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.
Power supply removal and replacement
The Brocade 6520 has two power supplies, as displayed in Figure 2 . The Fabric OS identifies the
power supplies from left to right on the non-port side as power supply #2 and power supply #1.
CAUTION
Disassembling any part of the power supply voids the part warranty and regulatory certifications.
There are no user-serviceable parts inside the power supply. Because the cooling system relies
on pressurized air, do not leave either of the power supply slots empty longer than two minutes
while the switch is operating. If a power supply fails, leave it in the switch until it can be replaced.
Maintain both power supplies in operational condition to provide redundancy.
Refer to Table 8 on page 20 for the power supply status LED colors, behaviors, and actions
required, if any.
Determining the need to replace a power supply
Use one of the following methods to determine the status of the power supplies:
• Check the power supply AC status and DC status LEDs. Both should be green (refer to “LED
locations” on page 17). If the DC status LED is amber, there is no power on the cord.
• In Web Tools, click the Power Status icon.
AIRFLOW AIRFLOW
E