RE: [Xen-devel] starting domain when block device already mounted

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

Oops. This machine is actually using something pre-2.0, so please ignore
everything I've said :) I'll complain again if it doesn't work when I
upgrade this machine.

Sorry about that.

James

> -----Original Message-----
> From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
> Sent: Monday, 17 January 2005 09:49
> To: Ian Pratt; xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] starting domain when block device already
mounted
> 
> My disks line is:
> 
> disk = [ 'phy:vg00/mail,0301,w', 'phy:vg00/mail-swap,0302,w' ]
> 
> The unpriv domain is up and running again, although I don't know what
> damage has been done. /etc/passwd was missing though which is not a
good
> sign. I found it in /lost+found, but who knows what else is missing!
> 
> Thanks
> 
> James
> 
> > -----Original Message-----
> > From: Ian Pratt [mailto:m+Ian.Pratt@xxxxxxxxxxxx]
> > Sent: Monday, 17 January 2005 09:34
> > To: James Harper; xen-devel@xxxxxxxxxxxxxxxxxxxxx
> > Subject: RE: [Xen-devel] starting domain when block device already
> mounted
> >
> > > I just had a filesystem hosed in an unpriv domain (ext3
> > > errors all over
> > > the place), and then when I went to do a fsck on the block device
it
> > > told me it was already mounted, and sure enough, dom0 already had
> the
> > > device mounted. Would that cause a filesystem crash, or at
> > > least errors?
> > > Dom0 wasn't doing anything to the filesystem, and the unpriv
> > > domain had
> > > been up for a few weeks before this occurred.
> >
> > Mounting an ext3 file system writeable in two domains is almost
> certain
> > to destroy it.
> >
> > The tools try and prevent this. Was it a 'file:' vbd? There's
> currently
> > no safety checks for those, but there should be for physical
partition
> > and LVM volumes.
> >
> > Ian
> >
> > > Anyway, I've done this a few times before by mistake - made a few
> > > changes to the unpriv domain's filesystem from dom0 and forgot to
> > > unmount it before starting the domain. Is there any easy way
> > > to get 'xm
> > > create' to check before starting that none of the block devices it
> is
> > > about to export are in use? Such a thing would probably save me
> > > countless headaches in the future! (or maybe it's been done
> > > already? I'm
> > > running 2.0.1)
> > >
> > > Thanks
> > >
> > > James
> > >
> > >
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> 
> 
> 
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