Protection at the operating system level takes place when the PICL environmental monitoring program (envmond) is running. The environmental monitoring program is part of a UNIX daemon that runs automatically when the Solaris OS boots up.
In a typical environmental monitoring application program, the software reads the CPU, inlet, and exhaust temperature sensors once every polling cycle. The program then compares the measured CPU diode temperature with the warning temperature and displays a warning message on the default output device whenever the warning temperature is exceeded.
The program can also issue a shutdown message on the default output device whenever the measured CPU diode temperature exceeds the shutdown temperature. In addition, the envmond application program can be programmed to sync and shut down the Solaris OS when conditions warrant.
Refer to “Sample Application Program” on page 37 for an example of how a simple envmond program can be implemented.
The power module is controlled by the SMC subsystem, except for automatic controls such as overcurrent shutdown or voltage regulation. The functions controlled are core voltage output level, and power sequencing and monitoring.
Post Shutdown Recovery
The
There is no mechanism for the Solaris OS to either recover or restore power to the Netra CP2500 when an unusual condition occurs, for example, if the CPU diode temperature exceeds its maximum recommended level. In either case, the end user must intervene and manually recover the Netra CP2500 as well as the system through hardware control. Once a shutdown has occurred, you can recover the board using a
Chapter 2 Environmental Monitoring 27
