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

Eduard Matei eduard.matei at cloudfounders.com
Tue Nov 11 09:10:55 UTC 2014


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

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

I know it's tricky to debug since we use a custom cinder driver, but anyone
has any ideas where to start looking?



*Eduard Biceri Matei, Senior Software Developer*
 | eduard.matei at cloudfounders.com

*CloudFounders, The Private Cloud Software Company*

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