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Re: [Xen-users] Booting Domain0 with LVM under CentOS

  • To: "Jerry Amundson" <jamundso@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Nico Kadel-Garcia" <nkadel@xxxxxxxxx>
  • Date: Sun, 25 Feb 2007 17:37:20 -0000
  • Delivery-date: Sun, 25 Feb 2007 09:36:24 -0800
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Jerry Amundson wrote:
[my reply on topic is below]

kanour, please reply to lists, not directly to posters.

On 2/25/07, kanour-xen <xen@xxxxxxxxxx> wrote:
Jerry Amundson wrote:
On 2/4/07, Devraj Mukherjee <devraj@xxxxxxxxx> wrote:
Hi Everyone,

I am trying to boot a CentOS 4.4 system with the Xen 64 bit kernel
and am failing because it seems that the Xen Kernel doesn't
support LVM

It's more likely a missing initrd module for your disk controller.
What messages appear during boot?
Did you run mkinitrd?

title Xen 3.0.4 (2.6.16-xen)
       root (hd0,0)
       kernel /xen.gz dom0_mem=256M
       module /vmlinuz-2.6.16-xen ro root=/dev/VolGroup00/LogVol00
       init 3 module /initrd-


Just compile support for LVM into kernel. NOT MODULES!!!

Yes modules, NOT KERNEL!
This is why we have kernel modules. It's a fine environment as-is, why
suggest such a thing as a kernel rebuild??

Here is another example of the deficiencies in the rpm install. The
vanilla kernel rpm install maintains a bootable system, so should the
kernel-xen rpm install. Period.
(Knowing what I do now, my time would have been better served suppling
patches to fix the problems, rather than posting the workaround all
these times...)

It does in the RedHat 4.92 beta distribution. Basically, the "grubby" tool that builds grub.conf entries needs to understand about Xen, and RedHat Enteprise 4.x is simply too old to have this feature. Rolling back the 4.92 or the Fedora Core 6 versions of the grub and associated tools is feasible, but way too much work. If you want such tools in RedHat based releases, I'm afraid you need to pony up the money and have someone write them.

Wait a month or two: RedHat 5 is due out in March, and I'm sure CentOs 5 will follow almost immediately upon its release.

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