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Replacing a fan and communications module
Attention: Before you replace a fan and communications module, consider the
following factors:
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 subsystem 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 LED on the bezel is lit and the overheated power supply automatically
shuts down (the green power LED 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 LEDs (fault LED on the front and power LED on the
back). If the power supply fault LED remains on, replace the power supply. For
more information, see “Checking the LEDs” on page 127.
v If you replace the fan and communications module and still experience problems,
the DS4500 might have defective components or connections. Check the
storage-management software for indications of other component failures.
When
instructed by the storage-management or diagnostic software, replace the fan
and communications module by using the following procedure:
Attention: To prevent damage to the DS4500 Storage Subsystem circuitry, do not
operate the DS4500 without adequate ventilation to the power supplies and mini
hubs. If it will take longer than 15 minutes to replace the this module, you must shut
down the DS4500 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 LEDs).
1. Disconnect all Ethernet interface cables from the failed fan and communications
module (see Figure 104 for locations of the ports).
Figure 104. Fan and communications module ports
154 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide