[Xen-users] How to Backup and Restore MBR within Logical Volumes?

[Mr. Teo En Ming (Zhang Enming)]

> dd if=/dev/virtualmachines/windows7-x64 of=mbr.w7-x64 bs=512 count=1

I think if you do this, you are only backing up the first 512 bytes of the
logical volume, not the MBR.

Someone correct me if I am wrong.

-- 
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On Thu, Nov 12, 2009 at 9:36 AM, Geert Janssens <info at kobaltwit.be> wrote:

> On Thursday 12 November 2009, Mr. Teo En Ming (Zhang Enming) wrote:
> > Hi All,
> >
> > I have several Xen virtual machines within logical volumes using LVM2. I
> > did not use disk images for performance reasons.
> >
> > Conventionally, if I want to clone my virtual machines, I have to dd the
> LV
> > to an image file. But this consumes a lot of time and harddisk space.
> >
> > So, instead of doing that, I want to use losetup and kpartx with my
> logical
> > volumes, which contain operating systems of virtual machines.
> >
> > I can backup the filesystems of a virtual machine in this way:
> >
> > # losetup /dev/loop1 /dev/virtualmachines/windows7-x64
> >
> Are you sure you need to call losetup first ?
>
> I remember I used kpartx directly on the lvm containing my vbd.
>
> Also, I think you can treat the lvm based vbd as a real disk.
>
> So
> dd if=/dev/virtualmachines/windows7-x64 of=mbr.w7-x64 bs=512 count=1
>
> should backup your mbr.
>
> Anyone correct me if I'm wrong please.
>
> Geert
>
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