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

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

Are you mounting the device within dom0 after creating the domU?  I'm 
not sure there's anything Xend can do about that.
Regards,

James Harper wrote:

> 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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