[openstack-dev] [OpenStack-dev][Nova] Migration stuck - resize/migrating

Solly Ross sross at redhat.com
Wed Nov 19 20:07:30 UTC 2014

Indeed.  Ensure you have SSH access between compute nodes (I'm working on some code to remove this requirement, but it may be a while before it gets merged).

Also, if you can, could you post logs somewhere with the 'debug' config option enabled?  I might be able to spot something quickly, since I've been working on the related code recently.

Best Regards,
Solly Ross

----- Original Message -----
> From: "Vishvananda Ishaya" <vishvananda at gmail.com>
> To: "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org>
> Sent: Tuesday, November 18, 2014 4:07:31 PM
> Subject: Re: [openstack-dev] [OpenStack-dev][Nova] Migration stuck -	resize/migrating
> Migrate/resize uses scp to copy files back and forth with the libvirt driver.
> This shouldn’t be necessary with shared storage, but it may still need ssh
> configured between the user that nova is running as in order to complete the
> migration. It is also possible that there is a bug in the code path dealing
> with shared storage, although I would have expected you to see a traceback
> somewhere.
> Vish
> On Nov 11, 2014, at 1:10 AM, Eduard Matei < eduard.matei at cloudfounders.com >
> wrote:
> Hi,
> I'm testing our cinder volume driver in the following setup:
> - 2 nodes, ubuntu, devstack juno (2014.2.1)
> - shared storage (common backend), our custom software solution + cinder
> volume on shared storage
> - 1 instance running on node 1, /instances directory on shared storage
> - kvm, libvirt (with live migration flags)
> Live migration of instance between nodes works perfectly.
> Migrate simply blocks. The instance in in status Resize/Migrate, no errors in
> n-cpu or n-sch, and it stays like that for over 8 hours (all night). I
> thought it was copying the disk, but it's a 20GB sparse file with approx.
> 200 mb of data, and the nodes have 1Gbps link, so it should be a couple of
> seconds.
> Any difference between live migration and "migration"?
> As i said, we use a "shared filesystem"-like storage solution so the volume
> files and the instance files are visible on both nodes, so no data needs
> copying.
> I know it's tricky to debug since we use a custom cinder driver, but anyone
> has any ideas where to start looking?
> Thanks,
> Eduard
> --
> Eduard Biceri Matei, Senior Software Developer
> www.cloudfounders.com
> | eduard.matei at cloudfounders.com
> CloudFounders, The Private Cloud Software Company
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