[ovirt-users] Live migration fails

[Charles Tassell]

Hi Nick,

   I had this problem myself a while ago and it turned out the issue was 
DNS related (one of the hosts couldn't do a DNS lookup on the name 
registered to the other host so it failed with a strange error.)  The 
best way to diagnose a migration failure is probably with the 
/var/log/vdsm/vdsm.log file (might be vdsmd instead of vdsm)  I'd 
recommend ssh'ing into both hosts and run the following command:

  tail -f /var/log/vdsm/vdsm.log |egrep -v 'DEBUG|INFO' |tee 
/tmp/migrate.log

Then attempt the migration.  When the GUI says the migration has failed 
hit Control-C in both windows to stop capturing the log. You can then go 
through the logfiles (stored in /tmp/migrate.log) to find the actual 
error message and post it to the list.  If you can't find the error you 
might want to upload the logfiles somewhere and post the URLs to the 
list so some of the devs or power users can better diagnose the problem.

On 16-04-14 01:00 PM, users-request at ovirt.org wrote:
> Date: Thu, 14 Apr 2016 16:35:34 +0200
> From: Sandro Bonazzola <sbonazzo at redhat.com>
> To: Nick Vercampt <nick.vercampt at gmail.com>
> Cc: users <users at ovirt.org>
> Subject: Re: [ovirt-users] Live migration fails
> Message-ID:
> 	<CAPQRNTkaqLE9_GHZJdM1Abj3zV7bYQZFx43gjT7jEUZwS=TsWg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> On Thu, Apr 14, 2016 at 2:14 PM, Nick Vercampt <nick.vercampt at gmail.com>
> wrote:
>
>> Dear Sirs
>>
>> I'm writing to ask a question about the live migration on my oVirt setup.
>>
>> I'm currently running oVirt 3.6 on a virtual test enviroment with 1
>> default cluster (2 hosts, CentOS 7)  and 1 Gluster enabled cluster (with 2
>> virtual storage nodes, also CentOS7).
>>
>> My datacenter has a shared data and iso volume for the two hosts (both
>> GlusterFS)
>>
>> Problem:
>> When i try to migrate my VM (Tiny Linux) from host1 to host2 the operation
>> fails.
>>
>> Question:
>> What log should I check to find a more detailed error message or do you
>> have an idea what the problem might be?
>>
>>
> Googling around, I found:
> - http://vaunaspada.babel.it/blog/?p=613
> - http://comments.gmane.org/gmane.comp.emulators.ovirt.user/32963
>
> I suggest to start from there. Maybe someone can write a page in ovirt
> website about how to diagnose live migration issues.
>
>
>> Kind Regards
>>
>> Nick Vercampt
>>
>>
>> _______________________________________________
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>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>>
>