[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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