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

To: Wayne Mallett <wayne.mallett@xxxxxxxxxx>
Subject: Re: [Xen-users] Migrating XEN VMs on CentOS 4.4 to CentOS 5
From: Nico Kadel-Garcia <nkadel@xxxxxxxxx>
Date: Fri, 11 May 2007 21:33:35 +0100
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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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