samba - Sep 2006 - GFS and samba

Hello,

We have two Fedora 5 Servers clustered with GFS. We installed samba 
and exported the same shares in both of them.
All went fine at first, with people accessing to theirs own files and 
so, but for some programs (minitab, matlab, ...) people need to access 
the same file at once. Then samba begins to fail and clients hang. In 
order to fix samba is necessary to restart the service. We've tried to 
put the shares in a filesystem without GFS and all goes well, people 
can access the same file without problems simultaneously.

Is a weird behaviour because the shares are exported from the two 
servers, but we really only access files simoultaneuosly using the s 
first server, the other server exports the shares too but isn't used 
by that clients.

I don't know how to debug this problem to see what is happening. It 
seems something related to GFS and Samba.
I have seen mails of people with samba+GFS problems, but we aren't 
using the same configuration, and the GFS rpm are updated:
         GFS-6.1.5-0.FC5.1
         GFS-kernel-2.6.15.1-5.FC5.32
Any help will be greatly apreciated.
Thanks,

Sandra

On Wed, 2006-09-27 at 17:20 +0200, sandra-llistes wrote:
> Hello,
> 
> We have two Fedora 5 Servers clustered with GFS. We installed samba 
> and exported the same shares in both of them.
> All went fine at first, with people accessing to theirs own files and 
> so, but for some programs (minitab, matlab, ...) people need to access 
> the same file at once. Then samba begins to fail and clients hang. In 
> order to fix samba is necessary to restart the service. We've tried to 
> put the shares in a filesystem without GFS and all goes well, people 
> can access the same file without problems simultaneously.
This certainly looks weird.  If the files are only ever accessed from
one node, then it *should* work, but I don't know if this is something
that has been tested with GFS specifically.  

Serious damage starts to happen when we have Samba accessing the same
files on both nodes, because all the state information isn't shared
between nodes.  (Proposals for a scalable solution for Samba to do this
are due on samba-technical in the next week).

If you are only using one node for Samba, it should be the same as a
local non-cluster filesystem, so perhaps raise this with the GFS
developers.

Andrew Bartlett

-- 
Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org
Samba Developer, Red Hat Inc.                  http://redhat.com

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