Environmental Monitoring And Control - Sun Microsystems Enterprise 250 Platform Notes

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
in the Sun Enterprise 250 Server Owner's Guide.
TABLE 1-3
Setting
enabled (default)
advise
disabled
In the following example, the env-monitor variable is used to disable
environmental monitoring at the OBP level.
ok setenv env-monitor disabled
Note – This NVRAM variable does not affect the system's environmental
monitoring and control capabilities while the operating system is running.
4 Platform Notes: Sun Enterprise 250 Server • September 1998
About Reliability, Availability, and Serviceability Features
Environmental Monitor Values and Effects
Monitor Active?
Yes
Yes
No
Action Taken
In response to a critical over temperature
condition, OBP issues a warning and
automatically shuts down the system after 30
seconds.
OBP issues a warning only, without shutting
down the system.
OBP takes no action at all; environmental
monitoring at the OBP level is disabled.