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Applies to:

Goal

Available for this topic, a brief how-to video tutorial that provides step-by-step instructions answering Sun's most frequently asked questions. View the video and/or follow the detailed instructions below.

Solution

1. Ensure that the domain is actually hung:

       - Can you ping the domain?
       - Can you telnet to the domain?

2. Ensure that the SC (System Controller) is not hung, If you can access the System Controller, proceed to login to the SC and obtain a platform shell.

       A.If you get to the platform shell run the following commands:

               SCname:SC> showlogs
               SCname:SC> showplatform

       B. If the SC is hung See Document 1002033.1 for details on how to recover from a hung system controller. Then go back to step 2A. 

3. Once in the platform shell attempt to get a domain shell:

               SCname:SC> console -d 

- If the command appears to hang, then we need to send a break signal to the domain.

       - if you are using telnet: Press CTRL ]
         at the telnet prompt type: send break

       - if you are connected to the SC via tip: use ~#

At this point you should have a domain shell prompt, continue with the following commands, otherwise continue to step 4.

- If you get the domain shell run the following commands:

               SCname:A> showdomain -p status
               SCname:A> showlogs

Then type break to get to the OBP. if this takes you to the ok prompt then type sync to force a core file.

4. If you were not able to get to the ok prompt, then the system is really hung and we will need to send an XIR (externally initiated reset) to the domain.

From the domain shell type: reset

This command will give different behavior depending on what the OBP
variable error-reset-recovery is set to. If this variable is set to
sync, a core file will attempt to be taken. If it is set to boot, then
the system will just reboot as if the boot command was issued at the
ok prompt. If it is set to none it should drop you to the ok prompt,
where you can run the following commands, the '#' sign represents the
cpu that we took the XIR on, use that number in the cbuf command if
possible run this command on each of the cpus (some depend on
firmware level of the SC):

{#} ok dump-sigblock
{#} ok # cbuf
{#} ok .xir-state-all

- If you were not able to return to the ok prompt, but have a domain prompt type the following command:

SCname:A> showresetstate

5. If none of these tactics work you may be forced in to just powering off the domain.

If this is the case then do a setkeyswitch off for the domain.

Instructions for Platforms employing Lights Out Management(LOM)

1. Ensure that the domain is actually hung:

       - Can you ping the domain?
       - Can you telnet to the domain?

2. Login to the LOM prompt via telnet/ssh or tip.

    A. once you get the lom prompt, run the following commands:

        lom>showsc -v
        lom>showlogs -v

3. Try to connect to the domain and see what state it is in:

   A. use the console commands to connect to domain

       lom> console

   B. If there's no response from console, use escape sequence to break out.
The default escape sequence is "#."

       lom>console
       #.
       lom>

   C. Once the domain is confirmed to be un-reachable, go to next step.

4. Using the 'break' or 'reset' command to recover.

   A. Try to break into the OBP by 'break' and if you get to OBP,
do a sync to collect a corefile.

      lom>break

      This will suspend Solaris.
Do you want to continue? [no] yes
Type 'go' to resume
debugger entered.

      {3} ok sync

  B. If 'break' does not work, a 'reset' has to be used
and 'showresetstate' collected as well. The behaviour of reset also
depends on the settings used in OBP for error-reset-recovery which
should preferably be set to 'sync'.

      lom>reset

      This will abruptly terminate Solaris.
Do you want to continue? [no] yes

      lom>showresetstate

5. If none of the procedures above work, a poweroff/poweron needs to be issued.

      lom> poweroff all
      lom> poweron all

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