I can smoothly create | delete volume,But I can not attach them to the exist instance

   [root@controller-128 ~]#  cinder create --display-name  TEST_VOLUME_05 1            
+---------------------+--------------------------------------+
|       Property      |                Value                 |
+---------------------+--------------------------------------+
|     attachments     |                  []                  |
|  availability_zone  |                 nova                 |
|       bootable      |                false                 |
|      created_at     |      2014-11-11T16:18:24.095813      |
| display_description |                 None                 |
|     display_name    |            TEST_VOLUME_05            |
|      encrypted      |                False                 |
|          id         | e0e5882e-4ddb-4b3e-929d-3d4dd6973f50 |
|       metadata      |                  {}                  |
|         size        |                  1                   |
|     snapshot_id     |                 None                 |
|     source_volid    |                 None                 |
|        status       |               creating               |
|     volume_type     |                 None                 |
+---------------------+--------------------------------------+
[root@controller-128 ~]# cinder list
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+
|                  ID                  |   Status  |   Display Name  | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+-----------------+------+-------------+----------+-------------+          |
| e0e5882e-4ddb-4b3e-929d-3d4dd6973f50 | available |  TEST_VOLUME_05 |  1   |     None    |  false   |             |

[root@controller-128 ~]# nova list
+--------------------------------------+------------+--------+------------+-------------+---------------------------------------------+
| ID                                   | Name       | Status | Task State | Power State | Networks                                    |
+--------------------------------------+------------+--------+------------+-------------+---------------------------------------------+
| 247d95f0-86cb-4295-9d0c-87871083751e | vlanTest01 | ACTIVE | -          | Running     | WAN_NET=42.xx.xx.180  

[root@controller-128 ~]# nova volume-attach  247d95f0-86cb-4295-9d0c-87871083751e e0e5882e-4ddb-4b3e-929d-3d4dd6973f50 auto
+----------+--------------------------------------+
| Property | Value                                |
+----------+--------------------------------------+
| device   | /dev/vdb                             |
| id       | e0e5882e-4ddb-4b3e-929d-3d4dd6973f50 |
| serverId | 247d95f0-86cb-4295-9d0c-87871083751e |
| volumeId | e0e5882e-4ddb-4b3e-929d-3d4dd6973f50 |
+----------+--------------------------------------+

but It does not really attached to the instance
[root@controller-128 ~]# cinder show e0e5882e-4ddb-4b3e-929d-3d4dd6973f50 
+--------------------------------+--------------------------------------+
|            Property            |                Value                 |
+--------------------------------+--------------------------------------+
|          attachments           |                  []                  |
|       availability_zone        |                 nova                 |
|            bootable            |                false                 |
|           created_at           |      2014-11-11T16:18:24.000000      |
|      display_description       |                 None                 |
|          display_name          |            TEST_VOLUME_05            |
|           encrypted            |                False                 |
|               id               | e0e5882e-4ddb-4b3e-929d-3d4dd6973f50 |
|            metadata            |                  {}                  |
|     os-vol-host-attr:host      |          KG-TEST-10_1_2_131          |
| os-vol-mig-status-attr:migstat |                 None                 |
| os-vol-mig-status-attr:name_id |                 None                 |
|  os-vol-tenant-attr:tenant_id  |   a174481a86f04181b0283a558c80b24e   |
|              size              |                  1                   |
|          snapshot_id           |                 None                 |
|          source_volid          |                 None                 |
|             status             |              available               |
|          volume_type           |                 None                 |
+--------------------------------+--------------------------------------+

The log shows up:

2014-11-12 00:19:54.821 25365 WARNING cinder.context [-] Arguments dropped when creating context: {'user': u'e0ba83d0903f4a368bd9869898e41256', 'tenant': u'a174481a86f04181b02}
2014-11-12 00:19:55.215 25365 ERROR cinder.brick.iscsi.iscsi [req-e6dadbe4-b9b4-4d44-babc-0916a45bdf2f e0ba83d0903f4a368bd9869898e41256 a174481a86f04181b0283a558c80b24e - - -].
2014-11-12 00:19:55.216 25365 ERROR oslo.messaging.rpc.dispatcher [req-e6dadbe4-b9b4-4d44-babc-0916a45bdf2f e0ba83d0903f4a368bd9869898e41256 a174481a86f04181b0283a558c80b24e -.
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/cinder/volume/manager.py", line 790, in initialize_connection
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher     volume)
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/cinder/volume/drivers/lvm.py", line 525, in create_export
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher     return self._create_export(context, volume)
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.6/site-packages/cinder/volume/drivers/lvm.py", line 534, in _create_export
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher     data = self.target_helper.create_export(context, volume, volume_path)
2014-11-12 00:19:55.216 25365 TRACE oslo.messaging.rpc.dispatcher   File "/usr ...