Silicon Graphics 2400, Owner'S Manual

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Chapter 8: System Maintenance and Troubleshooting
MSC Shutdown
Under specific circumstances, the MSC may shut down the system. Usually this occurs
when the operating environment becomes too warm because of fan failure, high ambient
temperatures, or a combination of the two.
The System Controller will automatically shut down the system and light the “Over
Temperature Fault” LED if any of the following situations occur:
• failure of two or more of the system’s nine fans
• failure of one fan plus a high ambient temperature
• failure of any (critical) fan directly responsible for cooling the power supply or a
router board
• an unacceptably high ambient temperature
Only the last situation can be dealt with completely by the end user. The first three
require a service call by a qualified support technician.
Fixing the MSC Shutdown
If you determine that a critical fan or fans have failed, you should immediately place a
service call. The system is not usable until the faulty fan(s) are replaced.
If the problem involves the combined failure of a single noncritical fan and a high
ambient temperature, you should place a service call. You may be able to keep the system
running by lowering the ambient temperature of the operating environment while
waiting for service.
You could
• lower the air conditioning temperature
• move the system to a cooler environment
• use a portable fan(s) to circulate more air around the system
• use a portable air-conditioner to lower the temperature of the system
If the problem is simply a high ambient temperature, you will need to either lower the
work environment temperature or move the system to an area with a lower ambient
temperature.