Re: X11-Cluster

To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: X11-Cluster
From: Joseph Mack <mack.joseph@xxxxxxx>
Date: Tue, 30 Apr 2002 11:13:04 -0400
Severin Olloz wrote:
> Hello together...
> I set up a X11-DR-Linux-Virtual-Server and it works good. The clients make a
> XDMCP-Query with a command like this:
> X :1 -query

fine. How are you handling the calls to CIP:6000 from the realservers?

> But sometimes (2 or 3 times in a day), the client makes a request, the
> X11-server starts on the worksation, but there is no login window from the
> kdm-daemon on the server. I listen on the ethernet device (eth0) of the
> director and see many many XDMCP-UDP-requests to the director. I shut down
> the X11-server on the workstation, but the XDMCP-traffic remains existing. I
> must plug off and plug in the network cable and after that, all works fine
> again.
> What can that be?

I don't know. It can't be timeouts, as it's happening when you initiate
a new session. 
> Can it be, that the client send UDP-packets and 1 packet goes to the
> real-server one and the other packet goes to the real server two -> chaos
> theory in action!?

it might be better to use the -dh scheduler than to use persistence. You
will need to set the TCPIP timeouts to a long time, in case the people walk
away from the keyboard.
Joseph Mack PhD, Senior Systems Engineer, Lockheed Martin
contractor to the National Environmental Supercomputer Center, 
mailto:mack.joseph@xxxxxxx ph# 919-541-0007, RTP, NC, USA

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