[Linux-cluster] NFS-ganesha - worthwhile replacement for kernel NFS?

[J. Bruce Fields]

On Tue, Oct 22, 2013 at 09:25:40AM +0000, Colin Simpson wrote:
> On Tue, 2013-10-22 at 10:24 +0200, Lars Marowsky-Bree wrote:
> > On 2013-10-21T15:58:18, Alan Brown <ajb2 at mssl.ucl.ac.uk> wrote:
> >
> > > As anyone who's tried to use kernel NFS in a clustered environment knows,
> > > it's fraught with issues which risk severe data corruption.
> >
> > Is it? How so?
> >
> >
> > Regards,
> >     Lars
> >
> > --
> > Architect Storage/HA
> > SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg)
> > "Experience is the name everyone gives to their mistakes." -- Oscar Wilde
> >
> The only thing I know about (and has bitten me) is that a GFS2
> filesystem isn't allowed to be exported on NFS and perform local access
> on it (e.g. Samba). Bad interaction between flocks (NFS) and plocks and
> the GFS2 glocks. The interaction on other filesystems between plocks and
> flocks could lead to file corruption. But in GFS2 this can and does lead
> to whole filesystem corruption. There is a bug open about it, but it's a
> tricky problem.

What's the bz #?

--b.

> I have a Red Hat information on this, not sure if it can
> be passed on.
> 
> I guess a user space NFS would fix that. And IMHO would be easier to
> manage as all filesystem access would be in userspace (so potentially
> more stable on NFS server issues (complexity moved out of kernel
> space)).
> 
> Thanks
> 
> Colin
> 
> 
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