[Linux-cluster] Cluster NFS causes kernel bug

Kevin Anderson kanderso at redhat.com
Thu Sep 13 22:35:06 UTC 2007

On Thu, 2007-09-13 at 17:34 -0400, Ward, Timothy - SSD wrote:
> From: Kevin Anderson <kanderso at redhat.com>
> On Thu, 2007-09-13 at 10:32 -0400, Ward, Timothy - SSD wrote:
> > I am trying to setup nfs as a clustered service.  The filesystem nfs 
> > is serving is a GFS2 fs.  So I am trying to find out is the problem 
> > with GFS2, NFS, the SMP processors or something else?
> > 
> We have fixed a number of bugs with GFS2 over the last few weeks, so
> would point at GFS2 as being the issue.  Pick up the latest kernel from
> Steve Whitehouses GIT tree.  It has a number of fixes, with a number of
> additional ones queued up to be pushed shortly.
> If you need a stable environment at this time, use GFS1 instead of gfs2.
> Kevin
> ------------------------------
> Kevin,
> Thank you for the valuable insight!
> I used the updated gfs2 RPM that was updated for FC6.  Would you suggest
> using FC5 with  gfs1 or is there a gfs1 RPM someplace for FC6?  I tried
> to compile the code myself with limited success.
We are working on getting gfs1 to work with FC7.  It is a bit
complicated due to gfs1 needing access to the dlm harness code that is
part of the gfs2 kernel module.  The symbols are not currently exported
in the gfs2 code, so a patch needs to be generated.  The patch isn't
something we believe would be accepted upstream since the symbols aren't
used by any other in kernel module.   Here is the exports you need:
--- linux-2.6.17.noarch/fs/gfs2/locking.c~      2006-08-10
13:33:09.000000000 -0
+++ linux-2.6.17.noarch/fs/gfs2/locking.c       2006-08-10
13:33:23.000000000 -0
@@ -188,4 +188,6 @@ void __init gfs2_init_lmh(void)

This is from our RHEL5 tree, so not sure it will apply directly, but you
can see what gets added.  Am sure there are probably other issues with
building against the FC6 environment, but this is a start.  

We have been primarily focused on getting GFS2 stable, but one of the
guys is going to spend sometime over the next couple of weeks working on
getting FC7 rpms built for gfs.

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