Comment 4 for bug 1222656

[vladikr@localhost devstack]$ nova list
+--------------------------------------+-----------+--------+------------+-------------+-------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+-----------+--------+------------+-------------+-------------------+
| 5da0f8be-c6d8-4992-a6c6-bbf2da3aefa9 | nhljkdsf | ACTIVE | deleting | Running | private=10.0.0.31 |
| bd3912c8-6c7f-4297-84b3-3fde73a51297 | test_swap | ACTIVE | None | Running | private=10.0.0.45 |
+--------------------------------------+-----------+--------+------------+-------------+-------------------+
[vladikr@localhost devstack]$ cinder list
+--------------------------------------+-----------+--------------+------+-------------+----------+--------------------------------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+----------+--------------------------------------+
| 21f0808c-53f0-4eaf-805f-1fef5d4d3f89 | in-use | | 2 | None | True | bd3912c8-6c7f-4297-84b3-3fde73a51297 |
| b30af6f7-d957-437e-be9d-e7e70e9426d1 | available | | 2 | None | True | |
+--------------------------------------+-----------+--------------+------+-------------+----------+--------------------------------------+

From the log:

2013-10-16 11:13:16.409 ERROR nova.api.openstack [req-86547e4f-789d-47d7-b22e-84a10c8f55d9 admin admin] Caught error: Volumes swap failed
Traceback (most recent call last):

  File "/home/vladikr/devel/openstack/nova/nova/openstack/common/rpc/amqp.py", line 461, in _process_data
    **args)

  File "/home/vladikr/devel/openstack/nova/nova/openstack/common/rpc/dispatcher.py", line 172, in dispatch
    result = getattr(proxyobj, method)(ctxt, **kwargs)

  File "/home/vladikr/devel/openstack/nova/nova/exception.py", line 90, in wrapped
    payload)

  File "/home/vladikr/devel/openstack/nova/nova/exception.py", line 73, in wrapped
    return f(self, context, *args, **kw)

  File "/home/vladikr/devel/openstack/nova/nova/compute/manager.py", line 244, in decorated_function
    pass

  File "/home/vladikr/devel/openstack/nova/nova/compute/manager.py", line 230, in decorated_function
    return function(self, context, *args, **kwargs)

  File "/home/vladikr/devel/openstack/nova/nova/compute/manager.py", line 272, in decorated_function
    e, sys.exc_info())

  File "/home/vladikr/devel/openstack/nova/nova/compute/manager.py", line 259, in decorated_function
    return function(self, context, *args, **kwargs)

  File "/home/vladikr/devel/openstack/nova/nova/compute/manager.py", line 3835, in swap_volume
    error=True)

  File "/home/vladikr/devel/openstack/nova/nova/compute/manager.py", line 3820, in swap_volume
    self.driver.swap_volume(old_cinfo, new_cinfo, instance, mountpoint)

  File "/home/vladikr/devel/openstack/nova/nova/virt/libvirt/driver.py", line 1174, in swap_volume
    self._swap_volume(virt_dom, disk_dev, conf.source_path)

  File "/home/vladikr/devel/openstack/nova/nova/virt/libvirt/driver.py", line 1149, in _swap_volume
    raise exception.NovaException(msg)

NovaException: Volumes swap failed

[vladikr@localhost devstack]$ nova volume-update test_swap 21f0808c-53f0-4eaf-805f-1fef5d4d3f89 b30af6f7-d957-437e-be9d-e7e70e9426d1
ERROR: The server has either erred or is incapable of performing the requested operation. (HTTP 500) (Request-ID: req-86547e4f-789d-47d7-b22e-84a10c8f55d9)
[vladikr@localhost devstack]$ cinder list
+--------------------------------------+-----------+--------------+------+-------------+----------+--------------------------------------+
| ID | Status | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+----------+--------------------------------------+
| 21f0808c-53f0-4eaf-805f-1fef5d4d3f89 | in-use | | 2 | None | True | bd3912c8-6c7f-4297-84b3-3fde73a51297 |
| b30af6f7-d957-437e-be9d-e7e70e9426d1 | available | | 2 | None | True | |
+--------------------------------------+-----------+--------------+------+-------------+----------+--------------------------------------+