Environmental Monitoring Subsystem; Replacing The Nvram Module - Sun Microsystems Enterprise 250 Product Notes

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Environmental Monitoring Subsystem

The temperature thresholds at which the Sun Enterprise 250 server reports and

responds to system over-temperature conditions have changed. The threshold values

published in the Sun Enterprise 250 Server Owner's Guide are no longer valid. The

new over-temperature thresholds are provided below.

Measurement Source

Ambient temperature

CPU module temperature

The system indicates an over-temperature condition if the ambient temperature

inside the system, or a temperature measured at a CPU module, reaches a warning

threshold. Should the ambient or CPU temperature reach a critical threshold, the

system is automatically shut down.

Note – The Sun Enterprise 250 server also issues a warning if the system

temperature reaches a low temperature threshold. The low temperature thresholds

for ambient and CPU module temperatures are 5 and 0 degrees C, respectively. Note

that there is no automatic system shutdown in response to a low temperature

condition.

For additional details, see "Environmental Monitoring and Control" in Chapter 4 of

the Sun Enterprise 250 Server Owner's Guide.

Caution – Before removing or installing the NVRAM module on the main logic

board, be sure to disconnect all four power cables from the main logic board. When

the power switch is in Standby mode, DC voltage (5 Volt Standby) is still present on

the main logic board. Removing or installing the NVRAM under these conditions

could corrupt the information stored in the NVRAM module and adversely affect

operation of the system. To avoid this problem, make sure that you disconnect all

power cables from the main logic board before handling the NVRAM module.

Sun Enterprise 250 Server Product Notes • February 1999

Temperature Threshold (degrees C)

Warning:

Critical:

Warning:

Critical:

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