[ovirt-devel] Re: Some feedback of an upgrade from 4.2 to 4.3 (EPYC Cluster)
On 30 Apr 2019, at 07:51, Yedidyah Bar David <didi(a)redhat.com>
wrote:
On Mon, Apr 29, 2019 at 3:18 PM Tobias Scheinert
<tobias.scheinert(a)uni-ulm.de> wrote:
>
> Hi,
>
> 1) Thank you all for the official support of the AMD EPYC processors in
> version 4.3! :-)
:-)
>
>
> 2) During the upgrade process I removed the old guest ISO file and
> replaced it with the new one (different filename of course). As I moved
> a virtual machine with the old ISO file mounted, the vm crashed.
>
> "Migration failed: Lost connection with qemu process (VM: <vmname>,
> Source: <ovirt-node-host>)."
>
> Yes I know this is not real bug (dumb user), but maybe it is good
> preventing the users for doing something stupid ;-)
how did you remove it exactly? deleted from the actual NFS storage? If yes then there’s no
way we could prevent that
Would you like to open a bugzilla bug to track this?
>
>
> 3) The log contains following messages after upgrading the node:
>
> "VDSM <ovirt-node-host> command Get Host Statistics failed: Internal
> JSON-RPC error: {'reason': '[Errno 19] genev_sys_6081 is not present in
> the system'}"
>
> This stops after some time ~20-30 minutes, but comes back after a
> restart of a node. And disappears again after some time. At the moment
> we have no problems and not taking this as a real issue.
No idea, but I see this is discussed in a separate thread currently.
>
>
> 4) If we are running Windows 10 guests newer than build version 1709,
> the vm crashes on our EPYC cluster, on the SandyBridge cluster the issue
> doesn't exists. The reason is the wrong CPU model of QEMU, see:
> <https://bugzilla.redhat.com/show_bug.cgi?id=1593190>
>
> We fixed this problem with a line in "/etc/modprobe.d/kvm.conf"
> "options kvm ignore_msrs=1”.
it may take time to fix. Fedora hosts might work, but they have different issues and I
wouldn’t recommend them in general. So if that workaround is fine for now please keep
using that until a fixed qemu find its way to CentOS.
Thanks,
michal
>
>
> Thank you all for this great piece of software :-)
Thanks for the report!
Best regards,
--
Didi
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