Silicon Graphics CHALLENGE L, User Manual, Page: 41 / 164

Cooling System
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The vaned rotor is in contact with the System Controller and changes speed
to provide more or less airflow, depending on the temperature of incoming
air (see Figure 2-7). These changes are initiated by a temperature sensor that
helps the System Controller adjust the rotor fan for efficient cooling with the
lowest possible noise level.
Note: If the rotary blower fan does not run after the main power is turned
on, the system will not boot. If the blower experiences a failure while the
system is running, the System Controller shuts down the server immediately
after notifying the CPU.