Re: IPMI watchdog question

[Corey Minyard <minyard@acm.org>]

The IPMI watchdog has never supported writing "V" to disable it.  It's a 
mixed bag with the other watchdogs, some do and some don't, but I can 
certainly add that function.  Or even better, I'd be happy to take a 
patch :).

-Corey

Holger Kiehl wrote:

>On Wed, 28 Jul 2004, Arkadiusz Miskiewicz wrote:
>
>  
>
>>On Wednesday 28 of July 2004 12:33, Holger Kiehl wrote:
>>
>>    
>>
>>>>Do you have CONFIG_WATCHDOG_NOWAYOUT enabled?
>>>>        
>>>>
>>>No this is not set. Must this be set? Actually I want that one can stop the
>>>watchdog gracefully. And this is done by writting a 'V' to /dev/watchdog,
>>>correct?
>>>      
>>>
>>Without CONFIG_WATCHDOG_NOWAYOUT (or nowayout=1 module option added by my 
>>patch just sent to lkml) when /dev/watchdog is closed then watchdog timer is 
>>disabled.
>>
>>    
>>
>Ok, with CONFIG_WATCHDOG_NOWAYOUT the system gets it reset. However now
>there is no save way to stop the watchdog gracefully. It no longer honors
>the magic letter 'V', but looking at the code of ipmi_watchtog.c I could
>find no place where it looks for the magic character 'V'. So I am still not
>sure what to do. The reason why I killed the process writting the heartbeat
>was that I just wanted to see if the watchdog does work. Or is there a
>simpler way to simulate a system hangup?
>
>Thanks,
>Holger
>  
>