[CentOS-virt] Testing new Xen Version and rollback.

Ben M. centos at rivint.com
Thu Oct 8 19:53:55 UTC 2009

I'm familiar with Gitco, and it is a very good repo, however, using 
Gitco to go to 3.4x killed my "standard" Centos installation and it 
(Xen) didn't work on 3.3x on my hardware.

I tried repo'ing in Gitco a couple of times, with yum priorities toggled 
on/off and different priority labels. Then I tried it with a fresh 
install, put on Yum AllowDowngrade util, but either I didn't have it 
config'd right, because it didn't allow a downgrade.

I was hoping that with a prerolled Xen binary, and a manual grub.conf 
entry, I could try it. But I just am clueless on depmod's impact on my 
"decent" installation.

I have two more Xen machines to build out, I could test on them I guess. 
I just would have felt a little more comfortable if Xen 3.4x deals with 
GPLPV as well as I have read (no PCI connection on Xen 3.1). The most 
very important thing is that the XenPV Shutdown Monitor does work, 
though disk speed doesn't seem to benefit from it. I must say Win2k8 is 
a disappointment over Win2k3 so far. Win2k3 was decent, fairly lean and 
very fast, virtual or "real."

Adam wrote:
> Check out this repository for Xen 3.4
> http://www.gitco.de/repo/
> -Adam
> On Thu, Oct 8, 2009 at 8:38 AM, Phil Schaffner 
> <Philip.R.Schaffner at nasa.gov <mailto:Philip.R.Schaffner at nasa.gov>> wrote:
>     Ben M. wrote on 10/06/2009 01:24 PM:
>      > I have a "fairly" stable Xen (CentOS 5.3 "standard" 3.1.x Xen)
>     install
>      > that I want to put into production within the next two weeks or so.
>      >
>      > I have some small (so far non-fatal) issues and tweaks that Xen 3.4.x
>      > may address. E.g. AMD x64 IOMMU bios read, GPLPV PCI connection, HPET
>      > clock, better GPLPV handling, and some others.
>      >
>      > My question is: that if I follow the directions at stacklet.com
>     <http://stacklet.com>
>      > (<http://stacklet.com/downloads/kernel>) to load up Xen 3.4 can/will
>      > depmod overwrite dependencies needed for my "standard" Xen kernel
>     that
>      > will not be available by a simple edit of grub.conf to restore the
>      > "standard" Xen kernel. I'm not familiar with depmod's actions.
>     You shouldn't have to worry about depmod - it will only operate on the
>     current running kernel, or the one you explicitly tell it to, and there
>     should be no direct interaction with GRUB.  I'd be much more worried
>     about installing tarballs onto an RPM based system, as Stacklet seems to
>     want to do from my brief look at the site you referenced.  Be sure you
>     have a good backup before proceeding with that.
>     Phil
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