Re: [idvusers] IDV/Xvfb behavior

If you have the kernel 2.6.18-128.1.10, or later (you can check by typing 
"uname -a" in a terminal window.), you have 5.3 already.  It was released in 
January, and comes with the normal RHEL 5 update process.

I looked in the release notes for 5.3, and it doesn't seem to mention Xvfb at 

I suspect there still may be a bug in Xvfb.  If you have already tried 5.3, and 
still have this problem, you may want to try a POSSIBLE solution that Evan 
Lowery(elowery@xxxxxxxxxxxx) has found - using IDV2.7b2 on a 32 bit system with 
Java 3D 1.3 (compatibility mode)

You may want to check with Evan and/or Unidata first, since I said before - I 
have not been able to find a solution to the Xvfb problem (other than running 
IDV scripts thru the Console)
From: Matt Alonso [matt.alonso@xxxxxxxxx]
Sent: Sunday, June 07, 2009 2:53 PM
To: Zehel, Samuel
Cc: Tom Whittaker; idvusers@xxxxxxxxxxxxxxxx
Subject: Re: [idvusers] IDV/Xvfb behavior

Hi Samuel,

Thanks very much for the reply.  I will definitely look into upgrading to 5.3 
and will report back what happens.  I agree, setting up virtual machine is not 
really something that I believe is possible for us at the moment.  The weird 
thing is that it runs fine on CentOS5 which seems a little odd.

Ultimately, the Xvfb is a temporary solution until I can identify what is 
causing ISL scripts to fail when offscreen is set to true.

Thanks again for the help Samuel and I will keep the list updated w/any 
progress I have.


On Fri, Jun 5, 2009 at 11:40 AM, Zehel, Samuel 
<zehel@xxxxxxx<mailto:zehel@xxxxxxx>> wrote:
The situation I ran into was not a hardware issue, because I could run the .isl 
script at the console with no problem.  Only Xvfb would fail(with a segment 

My belief was that RedHat introduced a bug to xvfb when moving to RHEL5, since 
RHEL3 seemed to work fine.  I submitted this issue to RedHat, and was told that 
this would be fixed in RHEL 5.3.

I have not been able to test the 5.3 fix, however Matt makes it sounds as 
though it may still be an issue.  If you haven't upgraded to 5.3, please do so, 
and let us know how it goes.

RedHat technical support also suggested using a Virtual(XEN) machine to run IDV 
with the .isl script, until RHEL 5.3 was released.  Unfortunately the amount of 
time/effort required to convert our server to XEN is prohibitive.  It also 
seems like using and elephant gun to kill a flea.  I was going to wait until 
5.3 came out, but the xvfb problem has now become a low priority at our site.