[Users] VM migrations failing

[Martin Kletzander]

On 01/31/2013 11:56 AM, Dan Kenigsberg wrote:
> On Thu, Jan 31, 2013 at 11:08:58AM +0100, Martin Kletzander wrote:
>> On 01/31/2013 10:25 AM, Dan Kenigsberg wrote:
>>> On Thu, Jan 31, 2013 at 09:43:44AM +0100, Martin Kletzander wrote:
>>>> On 01/30/2013 08:40 PM, Dead Horse wrote:
>>>>> The nodes are EL6.3 based.
>>>>>
>>>>> Currently installed libvirt packages:
>>>>>
>>>>> libvirt-lock-sanlock-0.9.10-21.el6_3.8.x86_64
>>>>> libvirt-cim-0.6.1-3.el6.x86_64
>>>>> libvirt-0.9.10-21.el6_3.8.x86_64
>>>>> libvirt-python-0.9.10-21.el6_3.8.x86_64
>>>>> libvirt-client-0.9.10-21.el6_3.8.x86_64
>>>>>
>>>>> and qemu packages:
>>>>> qemu-kvm-0.12.1.2-2.295.el6_3.10.x86_64
>>>>> qemu-kvm-tools-0.12.1.2-2.295.el6_3.10.x86_64
>>>>> qemu-img-0.12.1.2-2.295.el6_3.10.x86_64
>>>>>
>>>>> Thus my presumption here given the above is that virDomainMigrateToURI2 has
>>>>> not yet been patched and/or back-ported into the EL6.x libvirt/qemu?
>>>>>
>>>>
>>>> virDomainMigrateToURI2 is supported since 0.9.2, but is there a
>>>> possibility the code is requesting direct migration?  That might explain
>>>> the message, which is then incorrect; this was fixed in [1].
>>>>
>>>> Martin
>>>>
>>>> [1]
>>>> http://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=3189dfb1636da22d426d2fc07cc9f60304b16c5c
>>>
>>> What is "direct migration" exactly, in the context of qemu-kvm?
>>>
>>> We are using p2p migration
>>> http://gerrit.ovirt.org/gitweb?p=vdsm.git;a=blob;f=vdsm/libvirtvm.py;h=fe140ecbfac665248e2ad5c4bfaebaf54ab884cc;hb=18c24f7c7c27ac732c4a760caa9524e7319cd47e#l501
>>>
>>
>> OK, so that's not the issue, sorry for the confusion.  I was thinking it
>> would "somehow" get there.  Direct migration doesn't exist in QEMU at
>> all, so it seemed weird, but I can't seem to find any other reason for
>> this failure; will keep searching, though.
> 
> In this case, Dead Horse, would you try to migrate a VM (that you do not
> care much about) using
>     virsh -c qemu+tls://hostname/system migrate --p2p dsthost?
> 
> I'd like to see that the problem reproduces this way, too. More of
> libvirtd.log may help. You may want to disable iptables for a moment,
> just to eliminate a common cause of failure.
> 

The error message in this version of libvirt is emitted only in two
cases.  Either the QEMU driver doesn't support peer2peer migration
(which it does) or direct migration was requested (which wasn't) :)

So I agree with Dan, please try to reproduce this without ovirt/vdsm and
let us know (logs [1] will help a lot), because in case nobody fiddled
with anything, this sounds like a bug to me.

Martin

[1] http://libvirt.org/logging.html