Re: [Xen-users] Bad experience in mounting a domU disk

[Nuno Fernandes <npf-mlists@xxxxxxxxxxx>]

On Wednesday 04 June 2008 16:47:07 Alain Barthe wrote:
> 2008/6/4 RafaÅ Kupka
> <rkupka+Listy.Xen@xxxxxxxxxxxxx<rkupka%2BListy.Xen@xxxxxxxxxxxxx>
>
> > On Wed, Jun 04, 2008 at 11:00:43AM +0200, Alain Barthe wrote:
> >
> > Many journalled filesystems do replay journal even if mounted with 'ro'
> > option. XFS has norecovery option to truly read-only disk access.
> > Similar option has been recently added to ext3.
> >
> > I think that the best approach is to take LVM snapshot of domU
> > filesystem and then mount (with journal replayed) that snapshot.
>
> Thanks Rafal and Javier for your explanation, I begin to understand what
> happened.
>
> The ext3 fs has the option "noload" to disable the load of the journal. I
> looked for something like "nocache" to disable the cache, but it appears
> not to exist.
>
> My goal in mounting the filesystem of a alive domU is to monitor it
> (content of key files, free space, etc) in a non intrusive manner. Dealing
> with LVM snapshot is not obvious as we have no place enough for that.
>
> Does somebody have a similar need ?

if the filesystem is ext3, mount it ext2 and read-only.. It won't replay the 
journal as ext2 doesn't have any journal support...

Best regards,
Nuno Fernandes

>
> Thanks again.
>
> Alain.



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