Environmental Monitoring and Control

Environmental monitoring and control capabilities for Enterprise 250 servers reside at both the operating system level and the OBP firmware level. This ensures that monitoring capabilities are operational even if the system has halted or is unable to boot. The way in which OBP monitors and reacts to environmental over temperature conditions is controlled by the NVRAM variable env-monitor. The following table shows the various settings for this variable and the effect each setting has on OBP behavior. For additional information about the system's environmental monitoring capabilities, see "About Reliability, Availability, and Serviceability Features" in the Sun Enterprise 250 Server Owner's Guide.

Table 1-3 Environmental Monitor Values and Effects

Setting	Monitor Active?	Action Taken
enabled (default)	Yes	In response to a critical over temperature condition, OBP issues a warning and automatically shuts down the system after 30 seconds.
advise	Yes	OBP issues a warning only, without shutting down the system.
disabled	No	OBP takes no action at all; environmental monitoring at the OBP level is disabled.

In the following example, the env-monitor variable is used to disable environmental monitoring at the OBP level.

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ok setenv env-monitor disabled

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Note -

This NVRAM variable does not affect the system's environmental monitoring and control capabilities while the operating system is running.

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