Sun Enterprise 250 Server Owner's Guide

Environmental Failures

The environmental monitoring subsystem monitors the temperature of the system as well as the operation of the fans and power supplies. For more information on the environmental monitoring subsystem, see "Environmental Monitoring and Control".

In response to an environmental error condition, the monitoring subsystem generates error messages that are displayed on the system console and logged in the /var/adm/messages file. These error messages are described in the table below.

Table 12-7


Message	Type	Description
`TEMPERATURE WARNING: X degrees celsius at location Y.`	Warning	Indicates that the temperature measured at location Y has exceeded the warning threshold and if it continues to overheat the system will shutdown. If the value of location Y is a sensor on a CPU, (CP0 or CP1) the temperature (identified by the value X) has exceeded 60 degrees C. If the value of location Y is a sensor on the PDB (power distribution board), SCSI backplane, MB0 or MB1 (main logic board), the ambient temperature (identified by the value X) has exceeded 53 degrees C.
TEMPERATURE CRITICAL: `X` degrees celsius at location Y.	Warning	Indicates that the temperature measured at location Y has exceeded a critical threshold. After this warning message, the system automatically shuts down. If the value of location Y is a sensor on a CPU, (CP0 or CP1) the temperature (identified by the value X) has exceeded 65 degrees C. If the value of location Y is a sensor on the PDB (power distribution board), SCSI backplane, MB0 or MB1 (main logic board), the ambient temperature (identified by the value X) has exceeded 58 degrees C.
`Power Supply X NOT okay.`	Warning	Indicates that there is something wrong with the DC output of the supply. The system may shut down abruptly if the redundant power supply fails. The value X identifies the power supply, PS0 is the lower power supply; PS1 is the upper power supply.
`Power supply X inserted`	Advisory	A hot-swap feature to tell you that the power supply identified by X was installed without service disruption.
`Power supply X removed`	Advisory	A hot-swap feature to tell you that the power supply identified by X was removed without service disruption.
`WARNING: Fan failure has been detected`	Warning	Indicates a fan failure in the fan tray assembly.

If the environmental monitoring system detects a temperature problem, it also lights the temperature LED on the status and control panel. If it detects a power supply problem, it lights the power supply fault LED on the panel. The LEDs located on the power supplies themselves will help to further identify the problem. For information about system LEDs, see:

"About the Status and Control Panel"

"Front Panel LEDs"

"Power Supply LEDs"

Note -

Enterprise 250 power supplies will shut down automatically in response to certain over-temperature and power fault conditions (see "Environmental Monitoring and Control"). To recover from an automatic shutdown, you must disconnect the AC power cord, wait approximately 10 seconds, and then reconnect the power cord.