[Linux-cluster] NFS over GFS issue

[Mark Hlawatschek]

Kevin,

I created a new bugzilla entry 
(https://bugzilla.redhat.com/show_bug.cgi?id=455696) to track the problem.

Mark

On Wednesday 16 July 2008 20:56:19 Kevin Anderson wrote:
> Mark,
>
> Looks very similar to a bug that has been recently reported.
> Unfortunately the bug has a number of internal view only flags, so can't
> enable it for external access.  Your report is the first one to mention
> NFS.  Is it possible to get your test cases?
>
> Thanks
> Kevin
>
> On Wed, 2008-07-16 at 20:46 +0200, Mark Hlawatschek wrote:
> > Hi,
> >
> > During some stress tests with NFS over GFS, I observed a strange problem.
> >
> > The test setup consists of two GFS cluster nodes (node1, node2)
> > (RHEL4.6), both serving the same NFS exports (/mnt/gfstest)
> > The NFS exports are mounted by two NFS clients (client1, client2),
> > whereas client1 has mounted the NFS export from node1 and client2 has
> > mounted the NFS export from node2.
> >
> > During the stress test, client1 creates files into dir1 on the GFS and
> > client2 created files into dir2 on the same GFS. Node1 continuously reads
> > the files created by client1 and client2. After some time (about 10
> > minutes) the following error occurs on node1:
> >
> > GFS: fsid=axqa01:gfstest.0: fatal: assertion "!bd->bd_pinned
> > && !buffer_busy(bh)" failed
> > GFS: fsid=axqa01:gfstest.0:   function = ail_empty_gl
> > GFS: fsid=axqa01:gfstest.0:   file
> > = /builddir/build/BUILD/gfs-kernel-2.6.9-75/smp/src/gfs/dio.c, line = 383
> > GFS: fsid=axqa01:gfstest.0:   time = 1216216523
> > GFS: fsid=axqa01:gfstest.0: about to withdraw from the cluster
> > GFS: fsid=axqa01:gfstest.0: waiting for outstanding I/O
> > GFS: fsid=axqa01:gfstest.0: telling LM to withdraw
> > lock_dlm: withdraw abandoned memory
> > GFS: fsid=axqa01:gfstest.0: withdrawn
> >
> > Is there a workaround for this problem ? Is this a bug ?
> >
> > Thanks,
> >
> > Mark
>
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Gruss / Regards,

Dipl.-Ing. Mark Hlawatschek
http://www.atix.de/
http://www.open-sharedroot.org/

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