Comment 16 for bug 996840

Hmm this log from comment #2

-05-09 15:38:14.311+0000: 22564: debug : virJSONValueToString:1071 : result={"execute":"human-monitor-command","arguments":{"command-line":"drive_add dummy file=/dev/disk/by-path/ip-XXX.XXX.XXX.XXX:3260-iscsi-iqn.2010-10.org.openstack:volume-0000002b-lun-1,if=none,id=drive-virtio-disk5,format=raw"},"id":"libvirt-22"}

shows that the reporters' libvirt +QEMU are capable of doing the right thing and using human-monitor-command. So assuming this virsh demo was done against the same libvirtd instance, I think the most likely explanation is that Nova and virsh are somehow generating different XML, which causes different libvirt behaviour. We need to find out what XML virsh attach-interface creates.