Re: [Xen-users] Is it possible to copy the contents of one domU to another domU?

["Agent Rooker" <agentrooker@xxxxxxxxx>]

I'm a little confused, are you doing these steps in dom0 or your
centos domU?  If you're doing it in dom0, this message might indicate
that your logical volume is attached to the domU as a hard drive
rather than as a partition.  As such, it will have a partition table
and potentially a bunch of different partitions.

To make matters worse, if you installed from a disk (i.e., not from a
template) and you used the default partitioning scheme, you probably
have LVM set up in domU.  This means you have nested LVMs, and you'll
have to figure out some way to mount your nested domU filesystem in
dom0 if you want to follow these steps from dom0.

When I decided to move away from nested LVMs in my centos domUs, I
found this message extremely helpful.

http://lists.xensource.com/archives/html/xen-users/2008-09/msg00594.html

I think these steps (with some modification) might help you to migrate
your files to a smaller filesystem.  But to say for sure, I would need
to know more about your setup.


On Mon, Oct 27, 2008 at 9:56 AM, Chris Edwards
<cedwards@xxxxxxxxxxxxxxxx> wrote:
> In this section....
>
> # mount both LVMs
> mount /dev/mapper/VolGroup00--LogVol00 /mnt/oldroot
> mount /dev/mapper/VolGroup00--LogVol01 /mnt/newroot
>
> The system tells me that I need to specify the file system type.  For the 
> life of me I cannot determine the file system type.  Any hints would be 
> appreciated.
>
> Thanks!
> ---
>
> Chris Edwards
>
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Eamonn Kenny
> Sent: Wednesday, September 10, 2008 9:37 AM
> To: Rudi Ahlers
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Is it possible to copy the contents of one domU to 
> another domU?
>
> Hi Rudi,
>
> # create two directories for mount points
> mkdir -p /mnt/oldroot /mnt/newroot
>
> # create the 30G LVM
> lvcreate -L 30G -n VolGroup00-LogVol01 /dev/VolGroup00
> mkfs -t ext3 /dev/VolGroup00-LogVol01
>
> # mount both LVMs
> mount /dev/mapper/VolGroup00--LogVol00 /mnt/oldroot
> mount /dev/mapper/VolGroup00--LogVol01 /mnt/newroot
>
> # sync the data
> rsync -au /mnt/oldroot/* /mnt/newroot
> Alternatively use cp -ax as described in the Xen manual.
>
> #unmount partitions
> umount /mnt/oldroot
>
> # change networking on new domU
> chroot /mnt/newroot
> edit /etc/hosts, /etc/resolv.conf, /etc/sysconfig/network,
> /etc/sysconfig/network-scripts/ifcfg-*
> exit
> umount /mnt/newroot
>
> Hope the syntax is right, but you get the idea...
>
> Rudi Ahlers wrote:
>> Hi all
>>
>> I hope this can be solved.
>>
>> I have a 50GB CentOS domU, and I want to copy the contents of the domU
>> to another domU, of smaller size (30GB) - is this possible?
>>
>> --
>>
>> Kind Regards
>> Rudi Ahlers
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-users
>
>
> --
> _________________
> With Best regards,
>      Eamonn Kenny
>
> _________________________________________________________________________
>  Dr. Eamonn M. Kenny,          Telephone:               00+353-1-8961536
>  Webcom-G Manager,             Facsimile:               00+353-1-6772204
>  Computer Architecture Group,  Email:             Eamonn.Kenny@xxxxxxxxx
>  Computer Science Department,  www:    http://www.cs.tcd.ie/Eamonn.Kenny
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> _________________________________________________________________________
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>



-- 
Agent Rooker

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