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Chapter 3 System Administration 67
Prior to Solaris control, or following a Stop-A (L1-A) keyboard command, the
OpenBoot firmware will issue a warning message to the console after a temperature
of 75 ˚C (167 ˚F) is reached.
To indicate an overheating condition, the operating system monitoring subsystem
generates a warning or error message, and depending on the nature of the condition,
may even shut down the system. If a CPU module reaches shutdown temperature,
the system generates a warning message and automatically shuts itself down.
In the case of a power supply, a warning is not generated until its shutdown
temperature is reached and the power supply (if there is redundancy) or the system
is shut down, and a system fault is displayed on the system front panel LED. An
error message is logged in the /var/adm/messages file that the supply has failed.
All error and warning messages are displayed on the system console (if one is
attached) or they are redirected to the RSC console and are logged in the
/var/adm/messages file. Front panel fault LEDs remain lit after an automatic
system shutdown to aid in problem diagnosis.
System Fans
The monitoring subsystem is also designed to detect and respond to fan failures. The
system includes one fan tray assembly comprising three fans that normally run at
full speed. A single or multiple fan failure in the fan tray assembly causes the
monitoring subsystem to generate an error message, and lights the amber system
LED.
Power Supplies
The power panel is monitored in a similar fashion. The monitoring subsystem
periodically polls a power supply status register to verify power supply status. If the
panel detects a problem with a power supply, an error message is displayed on the
console (if one is attached) and the message is logged in the /var/adm/messages
file. The LEDs located on the power supply itself will indicate a failure or out-of-
spec voltage condition, and if two power supplies are installed, will indicate which
supply is the source of the fault.
An individual power supply will shut down itself at an internal temperature of
approximately 90 ˚C (194 ˚F), depending on the ambient temperature, system
loading, and the availability of a redundant power supply.