About Openboot Environmental Monitoring; Enabling Or Disabling The Openboot Environmental Monitor - Sun Microsystems Sun Fire V890 Owner's Manual

Note –
OpenBoot firmware and that you know how to enter the OpenBoot environment.
For more information about the OpenBoot firmware, see the OpenBoot 4.x Command
Reference Manual, which is available at http://docs.sun.com, under Solaris on
Sun Hardware. Refer to the Sun Fire V890 Server Product Notes for late-breaking
details.
About OpenBoot Environmental
Monitoring
Environmental monitoring and control capabilities for Sun Fire V890 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. Whenever the system is under OpenBoot control, the OpenBoot
environmental monitor checks the state of the system power supplies, fans, and
temperature sensors every 30 seconds. If it detects any voltage, current, fan speed, or
temperature irregularities, the monitor generates a warning message to the system
console. In the event of a critical fan failure or overtemperature condition, the
monitor generates a shutdown warning and automatically powers off the system
after 30 seconds to prevent hardware damage.
For additional information about the system's environmental monitoring
capabilities, see "Environmental Monitoring and Control" on page 17.
Enabling or Disabling the OpenBoot
Environmental Monitor
The OpenBoot environmental monitor is enabled by default whenever 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 106
"How to Disable OpenBoot Environmental Monitoring" on page 107
104 Sun Fire V890 Server Owner's Guide • September 2004
The procedures in this chapter assume that you are familiar with the