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Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 in Jeremy's PVOPS K

On Fri, Jul 24, 2009 at 03:11:36AM +0800, Teo En Ming wrote:
> Hi All,
> I think I may know when my CentOS 4.7 32-bit PV guest can't start. It's the 
> PAE kernel issue again.

Xen 3.x supports only PAE domU kernels..

so you need to have kernel-xenU installed, which _should_ be PAE

> After searching through the internet, I came across Pasi's article:
> Title:[CentOS-virt] Tips for installing Fedora 10 32bit Xen PV domU/guest     
> on 
> CentOS 5.3 dom0/host
> URL: http://lists.centos.org/pipermail/centos-virt/2009-March/000901.html
> Apparently, CentOS 4.7 32-bit anaconda installed the xenU (xen-aware) 
> kernel. Should I un-install the xenU (xen-aware kernel for 
> paravirtualization) and install the PAE kernel for my PV guest instead?
> <QUOTE Pasi Kärkkäinen>
> Xen only supports PAE kernels for 32bit PV guests.

Yep. And those PAE kernels need to be Xen-domU-kernels obviously :)
> </QUOTE>
> But then PAE kernels are not xen-aware, so that means I cannot run my CentOS 
> 4.7 32-bit as PV guest? Instead I got to run CentOS 4.7 32-bit as HVM guest? 
> Fully virtualized guests are slower than paravirtualized guests.
> Please advise. Thank you!

You definitely need kernel-xenU, and that should work just fine! It should
be PAE automatically. 

I'm running CentOS4 guests using kernel-xenU, booted with pygrub.

-- Pasi

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