Re: LVM Snapshots

[Marcelo Tosatti]

On Fri, 17 Oct 2003, Christoph Pleger wrote:

> ello,
> 
> On Fri, 17 Oct 2003 09:12:30 -0200 (BRST)
> Marcelo Tosatti <marcelo.tosatti@xxxxxxxxxxxx> wrote:
> 
> 
> > > > I am using a 2.4.22 kernel from www.kernel.org together with an
> > > > XFS patch from SGI. I want to use LVM for creating snapshots for
> > > > backups, but I found out that I cannot mount the snapshots of
> > > > journalling filesystems (EXT3, XFS, Reiser). Only JFS snapshots
> > > > can be mounted. My research on internet gave the result that a
> > > > kernel-patch must be used to solve that problem, but I could not
> > > > find such a patch for Linux 2.4.22, so where can I get it?
> > > 
> > > Marcelo decided not to apply that needed patch. Here it is for you
> > > to play with :) ... It'll apply with offsets to 2.4.23-pre7.
> > 
> > Because the patch touches generic fs code.
> > 
> > Dont use LVM with XFS for now.
> 
> I have used them together. The only thing that made problems at first
> after applying the LVM-patch was that I did not know that the special
> option "nouuid" is needed when mounting an XFS-Snapshot. But afterwards
> I had no problem so far. 
> 
> So why do you think that I should not use XFS on a logical volume?

Because the filesystem code lacks locking somewhere (thats what the 
patches adds). 

It seems its not safe to create snapshots of journalled fs'es without this
patch.

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