From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
To: Lawrence Walton <lawrence@the-penguin.otak.com>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: server migration
Date: Sun, 7 Mar 2004 12:31:50 +0200
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On Sunday 07 March 2004 03:35, Lawrence Walton wrote:
> Denis Vlasenko [vda@port.imtp.ilyichevsk.odessa.ua] wrote:
> > On Friday 05 March 2004 20:13, Lawrence Walton wrote:
> > > Hi all!
> > >
> > > I tried about four months ago to migrate a busy server to 2.6.0-test9,
> > > and failed miserably. Lightly loaded it worked well but as the number
> > > of users increased, the number of processes in uninterruptible sleep
> > > increased to the hundreds and then the server fell on it's face. I
> > > never found out exactly why or what processes where hanging if I
> > > guessed it would be openldap.
> >
> > Why do you guess? Determine what processes are stuck.
>
> Because I did not expect it to happen, I had lots of users screaming at
> me to fix it now, when it did happen. The server had been up sense the
> night before. It was not until users started showing up in the morning
> that the problem manifested itself.
>
> The point is I was hoping to get a list of things to try to capture in
> case it happened again, testing is all well and good, but getting
> information from a production box can be valuable, as long as it's not
> some odd corner case.
>
> Capturing SysRq-T was on my list to do.
> I'll investigate stack pointers, and If I can post stack traces.

Well. That's easy. Just press SysRq-T and look into syslog.
--
vda

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