live migrations not possible when using Libvirt/Xen with Cinder/NFS

[Christian Berendt]

Live migrations are not possible when using Libvirt/Xen with Cinder/NFS as storage backend.

InvalidSharedStorage: xxx is not on shared storage: Live migration can not be used without shared storage.

The issue is in the method check_can_live_migrate_source in nova/virt/libvirt/driver.py. has_local_disks is True, even if there are only volumes attached to an instance (is_volume_backed is also True). has_local_disks is True because get_instance_disk_info() returns disks as local because of the disk type file. NFS volumes are available with the disk type file in Libvirt and the method get_instance_disk_info() doesn't check if those disks are volumes or local disks.

[John Garbutt (johngarbutt)]

Doesn't affect xenserver, removing xenserver.

Given we now have deprecated warnings for the Xen support, I am not quite sure what we do with this kind of thing. Best effort I guess.

[John Garbutt (johngarbutt)]

I mean the Xen + libvirt support, in this case, not XenServer support.

[Sean Dague (sdague)]

Is this still an issue?

[Roman (bt-u)]

still an issue on my icehouse 2014.1.2 installation. any new information available?

[Richard Raseley (richard-raseley)]

I think I am seeing the same issue in RDO Icehouse-4.

https://bugs.launchpad.net/nova/+bug/1408477

[Sean Dague (sdague)]

I feel like this is a feature add for a hypervisor that never supported this. It's fine to fix, but it should be thought of as a feature not a bug.