IBM TotalStorage DS4500, User Manual

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Servicing notes
Consider the following factors when you service the fan and communications
module:
v
The fan and communications module contains two Ethernet connections used for
direct network-management.
v You can hot swap the fan and communications module as long as you complete
the exchange within 15 minutes from when you remove the failed unit until you
install the new one.
v It is unlikely that the storage server fan and the fan and communications module
cooling system will fail simultaneously. Such a failure will cause one or both
power supplies to overheat. In these circumstances, the amber power supply
indicator light on the bezel is lit and the overheated power supply automatically
shuts down (the green power indicator light on the power supply turns off). Once
the ambient air temperature cools below 70° C (158° F), the power supply
automatically turns on. Replace the failed fan and communications module. Then
check the power supply indicator lights (fault indicator light on the front and
power indicator light on the back). If the power supply fault indicator light remains
on, replace the power supply. For more information about indicator lights, see
“Fan and communications module indicator light” on page 31 and Figure 28 on
page 32.
v If you replace the fan and communications module and still experience problems,
the DS4500 Storage Server might have defective components or connections.
Check the storage-management software for indications of other component
failures.
Replacing a failed fan and communications module
When instructed by the storage-management or diagnostic software, replace the fan
and communications module.
Attention: To prevent damage to the DS4500 Storage Server circuitry, do not
operate the DS4500 Storage Server without adequate ventilation to the power
supplies and mini hubs. If it will take longer than 15 minutes to replace the fan and
communications module, you must shut down the DS4500 Storage Server to
prevent it from overheating. The time limit applies only to the total time that the fan
and communications module is out of the chassis. The time begins when you
remove the failed module and ends when you install the new one. This does not
include the time it takes you to perform this entire procedure (for example, checking
the indicator lights).
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IBM TotalStorage DS4500 Fibre Channel Storage Server: User’s Guide