Environmental Monitoring and Control
Environmental monitoring and control capabilities for an Ultra 450 system 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 owner's guide provided with your Ultra 450 system.
Table 2-4 Settings for the env-monitor Variable|
Setting |
Monitor Active? |
Action Taken |
|---|---|---|
|
enabled (default) |
Yes |
In response to an over temperature condition or a fan failure in either the CPU or disk fan tray, 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.
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.
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