Re: [Xen-users] Backup; mount domU FS RO?

["cornet@xxxxxxxxxx" <cornet@xxxxxxxxxx>]

Andy Smith wrote:
> On Sun, Dec 18, 2005 at 09:26:12PM +0100, Ralf Folkerts wrote:
>
> > I found some warnings that Filesystems may not be mounted RW by more
> > than one domain / system (makes sense when they don't "know" about each
> > other). However, are there any issues mounting a Filesystem Read-Only,
> > then have it being backed-up by Bacula and then unmount it?
>
> The short answer is yes, it's almost as bad as mounting it RW twice.
> Your dom0 kernel will make some assumptions about the read-only
> nature of the filesystem which will be invalidated when the domU
> changes it underneath.
>
> You need a cluster filesystem susch as GFS or OCFS2 to do this.
Or if you use LVM you can create snapshots from which you can backup 
your data.
Nathan

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