Temperature And Fan Speed; If A Fan Fails; Table 1-6 How Fan Speed Is Adjusted When One Fan Fails - Silicon Graphics Origin200 Owner's Manual

Chapter 1: Overview of the Origin200 System
24

Temperature and Fan Speed

Fan speeds adjust automatically depending upon the outside air temperature. A sensor
inside the chassis monitors the temperature of the air being drawn into the system.
Depending upon the air temperature and the number of fans working, the module
system controller (MSC) operates the fans at one of two speeds: low or high. Table 1-5
describes the relationship of the air temperature to fan speed.
Table 1-5 Relationship of Air Temperature to Fan Speed in an Origin200 Server
Air Temperature
Less than 83.3° F (28.5° C)
83.3° F (28.5° C) to 104° F (40° C)
You can check the fan speed using the module system controller via the AUX port. See
"Using the AUX Port and Module System Controller Commands" on page 98.

If a Fan Fails

If one of the three fans fails, the status LED displays solid amber. Also, the MSC
automatically adjusts the speed of the remaining two fans, or shuts down the system if
the temperature is too high. See Table 1-6.
Table 1-6 How Fan Speed Is Adjusted When One Fan Fails
Air Temperature
Less than 83.3° F (28.5° C)
83.3° F (28.5° C) to 104° F (40° C)
You can use the MSC to determine which fan has failed. See "Using the AUX Port and
Module System Controller Commands" in Chapter 4 for more information. For
information about replacing fans, see Chapter 10, "Removing and Replacing Internal
Components."
Action
Fans run at normal speed.
Fans run at high speed.
Action If One Fan Fails
Fans run at high speed.
Status LED displays solid amber.
System shuts down.