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52 Sun Fire V490 Server Administration Guide • August 2004
An online version of the manual is included with the Solaris Software
Supplement CD that ships with Solaris software. It is also is available at the
following web site under Solaris on Sun Hardware:
http://docs.sun.com
About OpenBoot Environmental
Monitoring
Environmental monitoring and control capabilities for Sun Fire V490 systems reside
at both the operating system level and the OpenBoot firmware level. This ensures
that monitoring capabilities are operational even if the system has halted or is
unable to boot. When the system is under OpenBoot control, the OpenBoot
environmental monitor checks the state of the system power supplies, fans, and
temperature sensors periodically. If it detects any voltage, current, fan speed, or
temperature irregularities, the monitor generates a warning message to the system
console.
For additional information about the system’s environmental monitoring
capabilities, see “Environmental Monitoring and Control” on page 20.
Enabling or Disabling the OpenBoot
Environmental Monitor
The OpenBoot environmental monitor is enabled by default when the system is
operating at the ok prompt. However, you can enable or disable it yourself using the
OpenBoot commands env-on and env-off. For more information, see:
■ “How to Enable OpenBoot Environmental Monitoring” on page 154
■ “How to Disable OpenBoot Environmental Monitoring” on page 154
The commands env-on and env-off only affect environmental monitoring at the
firmware level. They have no effect on the system’s environmental monitoring and
control capabilities while the operating system is running.