Open Stack

On 12/01/15 19:42, Yagmur Akbulut wrote:
> Hi all,
> 
> We are working on nova live-migration using Ceph. Before live-migration, Nova does a check to see if the remote is on shared storage. 
> 
> In order to make this test pass, we have patched Nova to always return True in _check_shared_storage_test_file located in nova/virt/libvirt/driver.py
> 
> The problem here is that since Nova assumes that /var/lib/nova/instances is on shared storage on both destination and source, we need to manually rsync the /var/lib/nova/instances/instance-id to the destination before running nova live-migration. 
> 
> See the discussion at http://t3349.file-systems-ceph-user.file-systemstalk.us/live-migration-of-vm-using-librbd-and-openstack-t3349.html
> 
> Currently, Nova doesn’t recognize Ceph backed VMs as being on shared storage and doesn’t transfer over the necessary folder before migration. 
> 
> I was wondering if the feature was already available, or on the feature list to be added to Nova.
> Or if we should be patching Nova to copy the folder over to the destination before live-migration.
> 
> Regards,
> Yagmur Akbulut

This should be improved in >= Juno
http://review.openstack.org/91722