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-rw-r--r--nova/virt/libvirt/driver.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/nova/virt/libvirt/driver.py b/nova/virt/libvirt/driver.py
index 666eb66f3..9c6da127c 100644
--- a/nova/virt/libvirt/driver.py
+++ b/nova/virt/libvirt/driver.py
@@ -1789,7 +1789,7 @@ class LibvirtDriver(driver.ComputeDriver):
# for nova.api.ec2.cloud.CloudController.get_metadata()
self.virtapi.instance_update(
nova_context.get_admin_context(), instance['uuid'],
- {'root_device_name': '/dev/' + disk_mapping['disk']['dev']})
+ {'root_device_name': root_device_name})
guest.os_type = vm_mode.get_from_instance(instance)