Sun Microsystems CP2500 manual Post Shutdown Recovery

Page 41

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 on-board voltage controller is a hardware function that is not controlled by either firmware or software. At the OpenBoot PROM level, if the board temperature exceeds the shutdown temperature, the SMC will shut down power to the Netra CP2500 CPU.

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 cold-reset IPMI command to SMC or by extracting and reinserting the board.

Chapter 2 Environmental Monitoring 27

Image 41

Contents Netra CP2500 Board Programming Guide Page Contents User Flash Figures Vi Netra CP2500 Board Programming Guide March Tables Viii Netra CP2500 Board Programming Guide March Code Samples Netra CP2500 Board Programming Guide March How This Book Is Organized PrefaceTypographic Conventions Using Unix CommandsRelated Documentation Shell PromptsSun Welcomes Your Comments Documentation, Support, and TrainingThird-Party Web Sites Overview Watchdog TimerPicl Plug-In Module 2Properties Under watchdog-controllerNode 1Watchdog Plug-In Interfaces for Netra CP2500 Board SoftwareHEALTHY# 3Properties Under watchdog-timerNodeCode Example 1-1System Watchdog Node Management Code Example Watchdog Node Management CodeCode Example 1-1System Watchdog Node Management Code Example Usagestr Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Null Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Notreached Code Example 1-1System Watchdog Node Management Code Example OpenBoot Prom Interface Netra CP2500 Board Programming Guide March Environmental Monitoring 1Compatible Environmental Monitoring Components Environmental Monitoring Component CompatibilityTypical Environmental Monitoring System Application I2C Environmental Monitoring Protection at the OpenBoot Prom Typical Cycle From Power Up to ShutdownPost Shutdown Recovery 3I2C Components Hardware Environmental Monitoring FunctionsEnvironmental Monitoring CPU Inlet, Exhaust, and CPU Temperature Monitoring Switching Power On and OffNetra CP2500 Board Programming Guide March Critical Temperature Response at OpenBoot Prom OpenBoot Prom Environmental MonitoringEnvironmental Monitoring Application Programming Using the show-sensorsCommand at OpenBoot Prom4PICL Temperature Sensor Class Node Properties Reading Temperature Sensor States UsingSolaris Driver Interface Using a Configuration File for Sensor InformationCode Example 2-1Sample envmond Application Program Sample Application ProgramCode Example 2-1Sample envmond Application Program Code Example 2-1Sample envmond Application Program Code Example 2-1Sample envmond Application Program Prtdiag command example Reading the CPU Temperature Environmental Limits5Description of Values Displayed by Solaris Commands User Flash Usage and Implementation User Flash1User Flash Node Properties OpenBoot Prom Device Tree and PropertiesUser Flash Driver User Flash Device Files Application Programming InterfaceInterface Header File 2System CallsCode Example 3-1PROM Information Structure Structures to Use in Ioctl ArgumentsCode Example 3-2User Flash Interface Structure ErrorsExample Programs Code Example 3-3Read Action on User Flash Device Read Example ProgramCode Example 3-4Write Action on User Flash Device Write Example ProgramCode Example 3-4Write Action on User Flash Device Code Example 3-5Block Erase Action on User Flash Device Block Erase Example ProgramCode Example 3-5Block Erase Action on User Flash Device Code Example 3-6Sample User Flash Application Program Sample User Flash Application ProgramCode Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Picl IndexWatchdog-controller, 3 Watchdog-timer, 3