Von: Michal Skrivanek [michal.skrivanek(a)redhat.com]
Gesendet: Freitag, 15. Februar 2019 18:53
An: Erick Perez
Cc: users(a)ovirt.org
Betreff: [ovirt-users] Re: Centos 7.6 and kernel upgrading
> On 14 Feb 2019, at 21:41, Erick Perez <eperez(a)quadrianweb.com> wrote:
>
> Good day,
> What is the Ovirt position on upgrading Centos 7.6 kernel from 3.10 to latext/stable
4.x series?
We do not test with anything but original RHEL/CentOS kernels. Fedora
is using newer kernels, but it’s a bumpy road to take...
oVirt has a lot of dependencies, virt stack, lvm, gluster...anything
can go wrong once you start updating to non-stable packages. But it
may also work if you’re feeling lucky:)
Some feedback from a Ovirt deployment with standard 4.14 kernel from
kernel.org for over 9 months. This is no recommendation to go that way
but a personal opinion.
First of all Redhat kernels are very stable and the use is very convenient.
But we always disliked the fact, that Redhat/CentOS kernels are branded
3.10.x while they are a total mixup of patches and enhancements. Some
examples why both ways have up and downsides.
1st example for CentOS being late with patches:
https://www.mail-archive.com/kvm@vger.kernel.org/msg124576.html
added patches targeted at 4.5 for Windows migration bugs. These are in
4.14 mainline since its first release in November 2017.
https://git.centos.org/blob/rpms!kernel.git/fd768ebf7d64cd053f749eae78e72...
added the same patches to the old 3.10 base kernel a year later in
December 2018.
2nd example for CentOS enhancements:
CentOS kernel 3.10 provides blk-mq support although that feature was
added in 3.13 and later mainline kernels
3rd example for instable
kernel.org versions:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?...
gives a funny insight about problems during kernel development and
backports. That resulted in unstable versions from 4.14.94 to 4.14.96.
To sum it up. Mainline longterm stable feels more dedicated to the policy
to add only fixes and no enhancements. Regarding stability had no
problems yet and no case where we missed patches from the CentOS tree
If you like to try it out, I uploaded a spec and config that I once took
from
elrepo.org. Just add the
kernel.org 4.14 tgz source and the
two missing elrepo cpupower files. You should be ready to go with a
simple "rpmbuild kernel-lt-4.14.spec".
config-4.14.97-x86_64:
https://ufile.io/n1og8
kernel-lt-4.14.spec:
https://ufile.io/ogp12
We will jump back onto the standard bandwagon when going to
CentOS 8 with kernel 4.18.
Best regards.
Markus
Thanks,
michal
> I cannot find a document related to the support.