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 


On Nov 11, 2014, at 1:10 AM, Eduard Matei <eduard.ma...@cloudfounders.com> 

> 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.ma...@cloudfounders.com
> CloudFounders, The Private Cloud Software Company
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