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

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Wayne Mallett wrote:
> 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.
Yeah, RedHat seems to have done some serious oddnesses to fit Xen into 
their industrieal system management approach. Migrating *old*, 
customized systems is unlikely to work well..
I do *not* use internal LVM's inside a Xen guest domain. There's little 
point in it or in the unnecessary CPU overhead: leave the LVM work to 
occur on the host domain, not the guest domain.
I also don't particularly like the insistince on using pygrub by the 
virt-install and virt-manager tools: Just install the kernel on the Dom0 
and leave it out of the DomU's!
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