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Date:      Thu, 9 Feb 2017 17:06:04 -0700
From:      The Doctor <doctor@doctor.nl2k.ab.ca>
To:        Polytropon <freebsd@edvax.de>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Hung server
Message-ID:  <20170210000604.GA15497@doctor.nl2k.ab.ca>
In-Reply-To: <20170210004658.8d24fd54.freebsd@edvax.de>
References:  <20170209232150.GA11245@doctor.nl2k.ab.ca> <20170210004658.8d24fd54.freebsd@edvax.de>

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On Fri, Feb 10, 2017 at 12:46:58AM +0100, Polytropon wrote:
> On Thu, 9 Feb 2017 16:21:50 -0700, The Doctor wrote:
> > Question?  I s there a way of detecting why a server 
> > hangs?
> 
> Can you be more specific?
> 
> 
> 
> > Within the last month my  Primary Server
> > has been going into infinity mood as like to
> > call it for about 2 hours at a time.
> > 
> > No signal can get through.
> 
> So you're observing the "networking aspect" of that server?
> Do you have a non-network connection (direct console, serial
> line, IPMI or something like that) that you can examine?
>

USB only.  I could adapt a serail but mostly USB.

> 
> 
> > Is this a kernel or app issue?
> 
> Could be even more, for example a firewall issue. A system
> completely hanging often indicates a lower level problem,
> for example related to the kernel or a device driver, but
> without proper diagnostics, it's really hard to tell. As I
> said, if everything you can observe happens on the "network
> aspect", it could as well be a firewall (of the server, or
> _infront of_ the server) that just blocks traffic while the
> programs the server runs keep working as intended...
>

Hmm!!  Ahead of  the server is L3 Switch.

> 
> 
> -- 
> Polytropon
> Magdeburg, Germany
> Happy FreeBSD user since 4.0
> Andra moi ennepe, Mousa, ...

-- 
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