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<div class="moz-cite-prefix">We have the same setup (Icehouse on
Ubuntu 12.04) and had similar issues. We downgraded qemu from 2.x
to 1.x, as we cannot terminate all VMs for all users. We had
non-resumable VMs also in the middle of the 1.x series and nothing
was documented in the changlelog.<br>
We had to do the same downgrade with openvswitch, the newest
version, under heavy load, corrupts packets in-transit, but we do
not have the time to investigate the issue further.<br>
<br>
We plan to warn our users in time for the next major upgrade to
Juno that all VMs need to be terminated, probably during the
Christmas holidays. I do not think they will be happy.<br>
Seeing also all the problems we had upgrading Neutron from OVS to
ML2, terminating all VMs is probably the best policy anyway during
an OpenStack upgrade. Or you do lots of migrations and upgrade
qemu one compute host at the time, but if something goes wrong you
end-up with an angry user and a stuck VM.<br>
<br>
It certainly is a big deal.<br>
<br>
On 10/20/14 00:59, Joe Topjian wrote:<br>
</div>
<blockquote
cite="mid:CA+y7hvhC0FnDR2M=tzYJchMQbLPLac78EwwhJLw0kS2KfihhBA@mail.gmail.com"
type="cite">
<div dir="ltr">Hello,
<div><br>
</div>
<div>We recently upgraded an OpenStack Grizzly environment to
Icehouse (doing a quick stop-over at Havana). This environment
is still running Ubuntu 12.04.</div>
<div><br>
</div>
<div>The <a moz-do-not-send="true"
href="https://wiki.ubuntu.com/TrustyTahr/ReleaseNotes#Ubuntu_Server">Ubuntu
14.04 release notes</a> make mention of incompatibilities
with 12.04 and moving to 14.04 and qemu 2.0. I didn't think
that this would apply for upgrades staying on 12.04, but it
indeed does.</div>
<div><br>
</div>
<div>We found that existing instances could not be live migrated
(as per the release notes). Additionally, instances that were
hard-rebooted and had the libvirt xml file rebuilt could no
longer start, either.</div>
<div><br>
</div>
<div>The exact error message we saw was:</div>
<div><br>
</div>
<div>"Length mismatch: vga.vram: 1000000 in != 800000"</div>
<div><br>
</div>
<div>I found a few bugs that are related to this, but I don't
think they're fully relevant to the issue I ran into:</div>
<div><br>
</div>
<div><a moz-do-not-send="true"
href="https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1308756">https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1308756</a><br>
</div>
<div><a moz-do-not-send="true"
href="https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1291321">https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1291321</a><br>
</div>
<div><a moz-do-not-send="true"
href="https://bugs.launchpad.net/nova/+bug/1312133">https://bugs.launchpad.net/nova/+bug/1312133</a><br>
</div>
<div><br>
</div>
<div>We ended up downgrading to the stock Ubuntu 12.04 qemu 1.0
packages and everything is working nicely.</div>
<div><br>
</div>
<div>I'm wondering if anyone else has run into this issue and
how they dealt with it or plan to deal with it.</div>
<div><br>
</div>
<div>Also, I'm curious as to why exactly qemu 1.x to 2.0 are
incompatible with each other. Is this just an Ubuntu issue? Or
is this native of qemu?</div>
<div><br>
</div>
<div>Unless I'm missing something, this seems like a big deal.
If we continue to use Ubuntu's OpenStack packages, we're
basically stuck at 12.04 and Icehouse unless we have all users
snapshot their instance and re-launch in a new cloud.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Joe</div>
<div><br>
</div>
</div>
<br>
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</blockquote>
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