Re: [Xen-users] How to make snapshot disk backup of Xen Guest Domain

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

On Thu, Apr 15, 2010 at 10:49 AM, KC LO <kclo2000@xxxxxxxxx> wrote:
> Hi all,
>
> I have created a DomU guest based on the following method :-
> 1) I create a LV with size 6GB : lvcreate -L 6G
> 2) I setup a new guest DomU with /dev/VolGroup00/vm1 as disk device
> 3) In DomU, I use /dev/hda as device to create partition for /boot, /,
> and swap without using LVM
>  fdisk -l /dev/hda
>
> Disk /dev/hda: 10.7 GB, 10737418240 bytes
> 255 heads, 63 sectors/track, 1305 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
>   Device Boot      Start         End      Blocks   Id  System
> /dev/hda1   *           1          13      104391   83  Linux
> /dev/hda2              14         521     4080510   83  Linux
> /dev/hda3             522         782     2096482+  82  Linux swap / Solaris
>
> I am now going to do snapshot disk backup at Dom0 for DomU.  I have read
> Internet that I can do
>
> lvcreate -L 1G -s -n guest_snapshot /dev/VolGroup00/vm1
> to create a Logical volume guest_snapshot.
>
> How can I mount the partition(/dev/hda1, /dev/hda2) under this volume
> guest_snapshot to do backup


kpartx -av /dev/VolGroup00/guest_snapshot

You should end up with /dev/mapper/guest_snapshot1 and
/dev/mapper/guest_snapshot2 (or similar) that you can mount.
Afterwards, don't forget to unmount it and run

kpartx -dv /dev/VolGroup00/guest_snapshot

-- 
Fajar

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