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

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Subject: Re: [Xen-users] Backup; mount domU FS RO?
From: Andy Smith <andy@xxxxxxxxxxxxxx>
Date: Sun, 18 Dec 2005 21:34:05 +0000
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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.

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