Re: [Xen-users] Mounting an image with loopback that contains an LVM

[Alexander Piavka <piavka@xxxxxxxxxxxx>]

On Thu, 6 Nov 2008, Ian Murray wrote:

> I have Ubuntu 8.04 Dom0 and CentOS 5.2 DomU. I want to be able to mount the 
> image file of the CentOS DomU in the Ubuntu Dom0 to copy some stuff onto it.
>
> I figured I could do it this way...
>
> Make sure DomU was destroyed.
>
> losetup /dev/loop1 /xen/test/test.img
 now you can use kpartx tool
kpartx -a /dev/loop1
 it will create the following device nodes
/dev/mapper/loop1p1
/dev/mapper/loop1p2
 which you can now access as normal block devices
 once finished use
kpartx -d /dev/loop1

> using 'p' in fdisk /dev/loop1 gives me what I would expect... two partitions....
>
> /dev/loop1p1 .... Linux
> /dev/loop1p2 .... Linux LVM
>
> when I run pvscan, it returns the error "no matching physical volumes found".
>
> When I run pvcan -vvv it appears to look at /dev/loop1 but simply states that 
> no label is found.
>
> Under LVM on both systems, I did a 'version' command:-
>
> Ubuntu Dom0
>
> LVM     2.02.26 2007-06-15
> Lib        1.02.20 2007-06-15
>
>
> CentOS DomU
>
> LVM    2.02.32-RHEL5    2008-03-04
> Lib       1.02.24                  2007-12-20
>
> Am I doing something wrong or is the problem with the slight mis-match of 
> versions?
>
> Thanks in advance,
>
> Ian.
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