Open Stack

Look at comment #2, it’s me.

> On Nov 2, 2017, at 11:34 AM, Sergio Cuellar Valdes <scuellarv at kionetworks.com> wrote:
> 
> Hi Mike,
> 
> Which version of OpenStack are you using ? Do the normal migrations work ? 
> 
> I found a bug that looks like your problem [1]
> 
> [1] https://bugs.launchpad.net/nova/+bug/1715569 <https://bugs.launchpad.net/nova/+bug/1715569>
> 
> Cheers,
> Sergio
> 
> On 2 November 2017 at 08:48, Mike Lowe <jomlowe at iu.edu <mailto:jomlowe at iu.edu>> wrote:
> After moving from CentOS 7.3 to 7.4, I’ve had trouble getting live migration to work when a volume is attached.  As it turns out when a live migration takes place the libvirt driver rewrites portions of the xml definition for the destination hypervisor and gets it wrong.  Here is an example.
> 
> It turns this:
> 
> disk device="disk" type="network">
>         <driver cache="writeback" name="qemu" type="raw"/>
>         <auth username="cinder">
>                 <secret type="ceph" uuid="1a790a26-dd49-4825-8d16-3dd627cf05a9"/>
>         </auth>
>         <source name="cinder-volumes/volume-de400476-b68a-45a2-b04f-739313f42bef" protocol="rbd">
>                 <host name="172.16.128.101" port="6789"/>
>                 <host name="172.16.128.121" port="6789"/>
>                 <host name="172.16.128.130" port="6789"/>
>         </source>
>         <target bus="scsi" dev="sdb"/>
>         <serial>de400476-b68a-45a2-b04f-739313f42bef</serial>
>         <address bus="0" controller="0" target="0" type="drive" unit="1"/>
> </disk>
> 
> Into this:
> 
> <disk device="disk" type="network">
>         <driver cache="writeback" name="qemu" type="raw"/>
>         <auth username="cinder">
>                 <secret type="ceph" uuid="1a790a26-dd49-4825-8d16-3dd627cf05a9"/>
>         </auth>
>         <source name="cinder-volumes/volume-de400476-b68a-45a2-b04f-739313f42bef" protocol="rbd">
>                 <host name="172.16.128.101" port="6789"/>
>                 <host name="172.16.128.121" port="6789"/>
>                 <host name="172.16.128.130" port="6789"/>
>         </source>
>         <target bus="scsi" dev="sdb"/>
>         <serial>de400476-b68a-45a2-b04f-739313f42bef</serial>
>         <address controller="0" type="drive"/>
> </disk>
> 
> Note the address change, libvirt will attempt to put this undefined disk at 0:0:0 which conflicts with the root disk and causes the migration to fail.  While this may be a libvirt bug I can’t imagine anything good would come from changing the scsi address of your disks mid flight so steps should be taken in nova if rewriting the definition to preserve the address.
> 
> Here is my question, when exactly would you want to change the definition of an attached volume?
> 
> 
> 
> _______________________________________________
> OpenStack-operators mailing list
> OpenStack-operators at lists.openstack.org <mailto:OpenStack-operators at lists.openstack.org>
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators <http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators>
> 
> 
> 
> -- 
>  Sergio Cuéllar │DevOps Engineer
>  KIO NETWORKS
>  Mexico City Phone (52) 55 8503 2600 ext. 4335
>  Mobile: 5544844298
>  www.kionetworks.com <http://www.kionetworks.com/>
> 
> 
> ***********************************************************************************************************************
> “Este mensaje es confidencial.  Si usted no es el destinatario de este mensaje, le suplicamos se lo notifique al remitente mediante un correo electrónico y que borre el presente mensaje y sus anexos de su computadora sin retener una copia de los mismos. No debe copiar este mensaje o usarlo para cualquier propósito ni divulgar su contenido. KIO Networks se reserva el derecho de monitorear todas las comunicaciones de correo electrónico (relacionadas o no con KIO Networks) que se transmitan a través de su sistema. Muchas gracias.
> This email is confidential and may also be privileged.  If you are not the intended recipient please immediately advise the sender by reply e-mail and delete this message and its attachments from your computer without retaining a copy. You should not copy it or use it for any purpose nor disclose its contents to any other person. KIO Networks reserves the right to monitor all email communications (whether related to the business of KIO Networks or not) through its networks. Thank you.”
> 
> ***********************************************************************************************************************_______________________________________________
> OpenStack-operators mailing list
> OpenStack-operators at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20171102/bdb85bb7/attachment.html>