Server Hang

[Alfredo De Luca]

Hi Jonathan.

I think you're right. The only thing I can think of is the  Oracle RAC
Cluster that might send this resetting for save the integrity of the
DB....in a few words is a fencing.

Thanks

Alfredo


On Sat, May 28, 2011 at 06:08, Jonathan Billings <jsbillin at umich.edu> wrote:

> On Fri, May 27, 2011 at 11:20:36AM +1000, Alfredo De Luca wrote:
> > Hi all.
> >
> > We have Red Hat Enterprise Linux Server release 5.5 running on Sun Blade
> > x6270 and occasionally the server hang with just error message in the
> logs:
> >
> > May 23 14:37:41 xxxxxxxxxxxx kernel: SysRq : Resetting
>
> Looks like someone hit the Magic Sysrq key for doing a reset:
> http://en.wikipedia.org/wiki/Magic_SysRq_key#Magic_commands
> (look at 'b' in the qwerty column)
>
> This is something done either from a keyboard, from a serial console
> (if that's set up) or someone running 'echo b > /proc/sysrq-trigger'.
>
> I think some load-balancing software uses the /proc/sysrq-trigger
> method to kill wedged server, so it might be an indicator something
> else is resetting the system.
>
>
> --
> Jonathan Billings <jsbillin at umich.edu>
> College of Engineering - CAEN - Unix and Linux Support
>
> --
> redhat-sysadmin-list mailing list
> redhat-sysadmin-list at redhat.com
> https://www.redhat.com/mailman/listinfo/redhat-sysadmin-list
>



-- 
*Alfredo*
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