Re: [Xen-users] Migrating XEN VMs on CentOS 4.4 to CentOS 5

[Wayne Mallett <wayne.mallett@xxxxxxxxxx>]

G'day All,

I read/heard(?) somewhere that xvda was the future and use of hda,  
sda, etc. was going to be phased out.  My main aim was to move  
xensource 3.0.3 VMs onto CentOS-5 (2.6.18-el5xen or subsequent  
kernel).  At present I have given up on the XEN distributed in CentOS  
5 and started working with XEN 3.1.0.  However, I would still be  
interested in knowing how to migrate VMs to the distribution  
installed XEN.  I tried an "xm migrate ..." but it didn't work (my  
XEN is setup for host-to-host migrations and they have worked in the  
past).  I have also tried using the same xen configuration file and  
moving contents of the logical volumes around but the VM won't boot  
on the new system.
Regards,

Wayne Mallett

On 10/05/2007, at 6:22 PM, Geert Janssens wrote:

> On Wednesday 9 May 2007 19:52, Nico Kadel-Garcia wrote:
> > Wayne Mallett wrote:
> > > G'day All,
> > >
> > > I have a number of VMs that I installed on CentOS 4.4 with custom  
> > > dom0
> > > and domU kernels.  All VMs reside on logical volumes and a
> > > disk = [ 'phy:/dev/vg0/name,sda1,w', ...]
> > > type entry can be found in the XEN configuration file.  I have been
> > > searching on and off for a week (no success)  trying to find out how
> > > to move these VMs onto a CentOS-5 system - using the XEN
> > > implementation that comes with this O/S.
> > >
> > > I suppose what I'm asking is how do I move existing VMs from sda to
> > > xvda disks within XEN.
> > Don't bother. Simply continue to use them as "sda" devices, which is
> > what I do. Also, getting a non-standard kernel to operate  
> > correctly in
> > paravirtualizd mode is going to be fun for you! I wound up using the
> > xensource published kernel-xen-2.6.16 kernel for this.
> >
> > If you really need to migrate to /dev/xdva names, you'll need to edit
> > /etc/fstab on the / partition to match the new layout, and edit  
> > your Xen
> > configuration file appropriately.
> ... And on top of that, the grub menu in the domU /boot/grub  
> directory should
> be updated to use /dev/xdva names. If not, pygrub will not work  
> correctly
> (presuming you are using pygrub, at least).
>
> That was a problem I ran into.
>
> Geert
Dr. Wayne Mallett
High Perf. & Research Computing Support
Information Technology & Resources
James Cook University
Townsville  Qld  4811
Australia

Ph (int):  5084
Ph (ext) :  07 4781 5084
Email:  Wayne.Mallett@xxxxxxxxxx




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