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About OpenBoot Environmental
Monitoring
Environmental monitoring and control capabilities for Sun Fire 880 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 16.
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 122
I
"How to Disable OpenBoot Environmental Monitoring" on page 123
I
Note – Using the Stop-A keyboard command to enter the OpenBoot environment
will immediately disable the OpenBoot environmental monitor. If you want the OBP
environmental monitor enabled, you must re-enable it prior to rebooting the system.
If you enter the OpenBoot environment through any other means — by halting the
operating system, by power-cycling the system, or as a result of a system panic —
the OpenBoot environmental monitor will remain enabled.
120
Sun Fire 880 Server Owner's Guide • August 2001
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