OpenBoot ok Prompt

Reaching the ok Prompt

There are several ways to reach the ok prompt, depending on the state of the system and the means by which you are accessing the system console. In decreasing order of desirability, the list is as follows:

• Graceful shutdown
• Graceful reset of the control domain using the ILOM reset command
• Manual system reset
• The Break key or the equivalent ALOM system controller command pair:
  -> set /HOST send_break_action=break
  -> start /SP/console -force

Command ok prompt

OK show-disks      —> To show the disks
OK probe-scsi        —> To search the scsi devices attached to the primary scsi controller
OK probe-scsi-all   —> To search all the scsi devices
OK devalias <alias> <path> —>To temporarily create a device alias
OK printenv            —->To view the current NVRAM settings
OK setenv <env> <value> —> To set the envirement variables
OK set-defaults                  —> To set the open boot prompt settings to the factory default
OK nvalias <alias> <path>  —>To set the device alias permanently to NVRAM
OK nvunalias cdrom1  —-> To remove the nvalias ‘cdrom1’ from NVRAMRC
OK .version   ——> To find out the Open boot prompt version
OK .ent_addr —–> To find out the ethernet MAC address
OK .speed    —–> To find out the CPU and PCI bus speeds
OK banner    —–> To display the Model,Architecture,processor,openboot version,ethernet address,hostid and etc
OK set-defaults —-> To reset variable values to the factory defaults
OK reset-all —–> To reboot the system from OK Prompt
OK show-devs  —–>To show the PCI devices
OK boot   —> boot the system from the default boot devices
OK boot cdrom —-> to boot from cdrom
OK boot disk —-> boots the system from device as specified by the disk device alias
OK boot device-path —->boot from the full device mentioned
OK boot net —-> network boot .boots from a TFTP boot server or Jumpstart server
OK boot bet -install  —–>Jumpstart boot.
OK boot tape —–> Tape boot.boots off a SCSI tape if available
OK boot -h —-> boot halted .boot into a halted state(ok prompt) intersting for troubleshooting boot at the lowest level
OK boot -r —-> Reconfiguration boot.Boot and search for all attached device.useful when new device attached to the system
OK boot -s —-> Single user.boots the system to run level 1
OK boot -v —-> verbose boot.show good debugging information.

Displaying System Information
Commands to display additional system related information .Not all commands work on all Platforms
OK .idprom  ——–> Display ID PROM contents
OK .traps  ——–> Display a list of processor-dependent trap types
OK show-devs —–>display list of installed and probed devices
OK eject floppy —-> Eject the floppy
OK eject cdrom ——>eject the cdrom
OK sync —–> call the operating system to write information to hard disk

Emergency Keyboard Commands
These are key sequences recognized by the system to perform predetermined
actions at boot time or during normal operation.

Stop     —> Bypass POST .(This command does not depend on security-mode)
Stop-A —> Abort.(This will also stop a running system. You can
resume normal operations if you enter go at the prompt.
Enter anything else and you will stay halted)
Stop-D  —> Enter diagnostic mode(set diag-switch?to true)
Stop-N  —> Reset NVRAM contents to default values.