hi , I 'd like to mark this as incomplete because I can not reproduce it with your step in my environment.

taget@liyong:/opt/stack/nova$ git log 
commit 183cd88cb2f9781b53f71b6b161df401c286c9ff
Merge: 3ee98a6 2833f8c
Author: Jenkins <email address hidden>
Date:   Sun Jul 26 13:34:34 2015 +0000

    Merge "remove _rescan_iscsi from disconnect_volume_multipath_iscsi"


taget@liyong:/opt/stack$ nova live-migration  test1 liyong2 --block-migrate
taget@liyong:/opt/stack$ nova show test1
+--------------------------------------+----------------------------------------------------------------+
| Property                             | Value                                                          |
+--------------------------------------+----------------------------------------------------------------+
| 192_net network                      | 192.168.0.32                                                   |
| OS-DCF:diskConfig                    | MANUAL                                                         |
| OS-EXT-AZ:availability_zone          | nova                                                           |
| OS-EXT-SRV-ATTR:host                 | liyong2                                                        |
| OS-EXT-SRV-ATTR:hypervisor_hostname  | liyong2                                                        |
| OS-EXT-SRV-ATTR:instance_name        | instance-00000061                                              |
| OS-EXT-STS:power_state               | 1                                                              |
| OS-EXT-STS:task_state                | -                                                              |
| OS-EXT-STS:vm_state                  | active                                                         |
| OS-SRV-USG:launched_at               | 2015-08-28T07:00:41.000000                                     |
| OS-SRV-USG:terminated_at             | -                                                              |
| accessIPv4                           |                                                                |
| accessIPv6                           |                                                                |
| config_drive                         |                                                                |
| created                              | 2015-08-28T07:00:31Z                                           |
| flavor                               | m1.tiny (1)                                                    |
| hostId                               | 7a2a33df86ec0a0aa08ab1337c6adf00e80573c5cefd403b05a02ceb       |
| id                                   | e00e9012-2832-4256-b820-ec5ae4769dd8                           |
| image                                | cirros-0.3.2-x86_64-uec (93169d18-1bb2-45f7-861c-6735ef687db9) |
| key_name                             | -                                                              |
| metadata                             | {}                                                             |
| name                                 | test1                                                          |
| os-extended-volumes:volumes_attached | []                                                             |
| progress                             | 0                                                              |
| security_groups                      | default                                                        |
| status                               | ACTIVE                                                         |
| tenant_id                            | 52a0ee83fb524376bd603547aea415a3                               |
| updated                              | 2015-08-28T07:02:19Z                                           |
| user_id                              | bea64c5634ae4f079c1c69ed29a68242                               |
+--------------------------------------+----------------------------------------------------------------+

taget@liyong:/opt/stack$ nova resize test1 2
taget@liyong:/opt/stack$ nova list
+--------------------------------------+-------+--------+------------------+-------------+----------+
| ID                                   | Name  | Status | Task State       | Power State | Networks |
+--------------------------------------+-------+--------+------------------+-------------+----------+
| e00e9012-2832-4256-b820-ec5ae4769dd8 | test1 | RESIZE | resize_migrating | Running     |          |
+--------------------------------------+-------+--------+------------------+-------------+----------+
taget@liyong:/opt/stack$ nova list
+--------------------------------------+-------+--------+---------------+-------------+----------+
| ID                                   | Name  | Status | Task State    | Power State | Networks |
+--------------------------------------+-------+--------+---------------+-------------+----------+
| e00e9012-2832-4256-b820-ec5ae4769dd8 | test1 | RESIZE | resize_finish | Running     |          |
+--------------------------------------+-------+--------+---------------+-------------+----------+
taget@liyong:/opt/stack$ nova show test1
+--------------------------------------+----------------------------------------------------------------+
| Property                             | Value                                                          |
+--------------------------------------+----------------------------------------------------------------+
| 192_net network                      | 192.168.0.32                                                   |
| OS-DCF:diskConfig                    | MANUAL                                                         |
| OS-EXT-AZ:availability_zone          | nova                                                           |
| OS-EXT-SRV-ATTR:host                 | liyong                                                         |
| OS-EXT-SRV-ATTR:hypervisor_hostname  | liyong                                                         |
| OS-EXT-SRV-ATTR:instance_name        | instance-00000061                                              |
| OS-EXT-STS:power_state               | 1                                                              |
| OS-EXT-STS:task_state                | -                                                              |
| OS-EXT-STS:vm_state                  | resized                                                        |
| OS-SRV-USG:launched_at               | 2015-08-28T07:03:52.000000                                     |
| OS-SRV-USG:terminated_at             | -                                                              |
| accessIPv4                           |                                                                |
| accessIPv6                           |                                                                |
| config_drive                         |                                                                |
| created                              | 2015-08-28T07:00:31Z                                           |
| flavor                               | m1.small (2)                                                   |
| hostId                               | 055c6f457079f44ab2328e541b09f610708c9aab18689588777e3e3e       |
| id                                   | e00e9012-2832-4256-b820-ec5ae4769dd8                           |
| image                                | cirros-0.3.2-x86_64-uec (93169d18-1bb2-45f7-861c-6735ef687db9) |
| key_name                             | -                                                              |
| metadata                             | {}                                                             |
| name                                 | test1                                                          |
| os-extended-volumes:volumes_attached | []                                                             |
| progress                             | 0                                                              |
| security_groups                      | default                                                        |
| status                               | VERIFY_RESIZE                                                  |
| tenant_id                            | 52a0ee83fb524376bd603547aea415a3                               |
| updated                              | 2015-08-28T07:03:52Z                                           |
| user_id                              | bea64c5634ae4f079c1c69ed29a68242                               |
+--------------------------------------+----------------------------------------------------------------+
taget@liyong:/opt/stack$ nova resize-revert test1
taget@liyong:/opt/stack$ nova show test1
+--------------------------------------+----------------------------------------------------------------+
| Property                             | Value                                                          |
+--------------------------------------+----------------------------------------------------------------+
| 192_net network                      | 192.168.0.32                                                   |
| OS-DCF:diskConfig                    | MANUAL                                                         |
| OS-EXT-AZ:availability_zone          | nova                                                           |
| OS-EXT-SRV-ATTR:host                 | liyong2                                                        |
| OS-EXT-SRV-ATTR:hypervisor_hostname  | liyong2                                                        |
| OS-EXT-SRV-ATTR:instance_name        | instance-00000061                                              |
| OS-EXT-STS:power_state               | 1                                                              |
| OS-EXT-STS:task_state                | -                                                              |
| OS-EXT-STS:vm_state                  | active                                                         |
| OS-SRV-USG:launched_at               | 2015-08-28T07:04:19.000000                                     |
| OS-SRV-USG:terminated_at             | -                                                              |
| accessIPv4                           |                                                                |
| accessIPv6                           |                                                                |
| config_drive                         |                                                                |
| created                              | 2015-08-28T07:00:31Z                                           |
| flavor                               | m1.tiny (1)                                                    |
| hostId                               | 7a2a33df86ec0a0aa08ab1337c6adf00e80573c5cefd403b05a02ceb       |
| id                                   | e00e9012-2832-4256-b820-ec5ae4769dd8                           |
| image                                | cirros-0.3.2-x86_64-uec (93169d18-1bb2-45f7-861c-6735ef687db9) |
| key_name                             | -                                                              |
| metadata                             | {}                                                             |
| name                                 | test1                                                          |
| os-extended-volumes:volumes_attached | []                                                             |
| progress                             | 0                                                              |
| security_groups                      | default                                                        |
| status                               | ACTIVE                                                         |
| tenant_id                            | 52a0ee83fb524376bd603547aea415a3                               |
| updated                              | 2015-08-28T07:04:19Z                                           |
| user_id                              | bea64c5634ae4f079c1c69ed29a68242                               |
+--------------------------------------+----------------------------------------------------------------+
taget@liyong:/opt/stack$ nova resize test1 3
taget@liyong:/opt/stack$ nova list
+--------------------------------------+-------+--------+------------------+-------------+----------+
| ID                                   | Name  | Status | Task State       | Power State | Networks |
+--------------------------------------+-------+--------+------------------+-------------+----------+
| e00e9012-2832-4256-b820-ec5ae4769dd8 | test1 | RESIZE | resize_migrating | Running     |          |
+--------------------------------------+-------+--------+------------------+-------------+----------+
taget@liyong:/opt/stack$ nova list
+--------------------------------------+-------+--------+-----------------+-------------+----------+
| ID                                   | Name  | Status | Task State      | Power State | Networks |
+--------------------------------------+-------+--------+-----------------+-------------+----------+
| e00e9012-2832-4256-b820-ec5ae4769dd8 | test1 | RESIZE | resize_migrated | Running     |          |
+--------------------------------------+-------+--------+-----------------+-------------+----------+
taget@liyong:/opt/stack$ nova list
+--------------------------------------+-------+--------+---------------+-------------+----------+
| ID                                   | Name  | Status | Task State    | Power State | Networks |
+--------------------------------------+-------+--------+---------------+-------------+----------+
| e00e9012-2832-4256-b820-ec5ae4769dd8 | test1 | RESIZE | resize_finish | Running     |          |
+--------------------------------------+-------+--------+---------------+-------------+----------+
taget@liyong:/opt/stack$ nova resei^C
taget@liyong:/opt/stack$ nova help | grep resize
    resize                      Resize a server.
    resize-confirm              Confirm a previous resize.
    resize-revert               Revert a previous resize (and return to the
taget@liyong:/opt/stack$ nova resize-confirm test1
taget@liyong:/opt/stack$ nova list
+--------------------------------------+-------+--------+------------+-------------+----------+
| ID                                   | Name  | Status | Task State | Power State | Networks |
+--------------------------------------+-------+--------+------------+-------------+----------+
| e00e9012-2832-4256-b820-ec5ae4769dd8 | test1 | ACTIVE | -          | Running     |          |
+--------------------------------------+-------+--------+------------+-------------+----------+
taget@liyong:/opt/stack$ nova show test1
+--------------------------------------+----------------------------------------------------------------+
| Property                             | Value                                                          |
+--------------------------------------+----------------------------------------------------------------+
| 192_net network                      | 192.168.0.32                                                   |
| OS-DCF:diskConfig                    | MANUAL                                                         |
| OS-EXT-AZ:availability_zone          | nova                                                           |
| OS-EXT-SRV-ATTR:host                 | liyong                                                         |
| OS-EXT-SRV-ATTR:hypervisor_hostname  | liyong                                                         |
| OS-EXT-SRV-ATTR:instance_name        | instance-00000061                                              |
| OS-EXT-STS:power_state               | 1                                                              |
| OS-EXT-STS:task_state                | -                                                              |
| OS-EXT-STS:vm_state                  | active                                                         |
| OS-SRV-USG:launched_at               | 2015-08-28T07:04:52.000000                                     |
| OS-SRV-USG:terminated_at             | -                                                              |
| accessIPv4                           |                                                                |
| accessIPv6                           |                                                                |
| config_drive                         |                                                                |
| created                              | 2015-08-28T07:00:31Z                                           |
| flavor                               | m1.medium (3)                                                  |
| hostId                               | 055c6f457079f44ab2328e541b09f610708c9aab18689588777e3e3e       |
| id                                   | e00e9012-2832-4256-b820-ec5ae4769dd8                           |
| image                                | cirros-0.3.2-x86_64-uec (93169d18-1bb2-45f7-861c-6735ef687db9) |
| key_name                             | -                                                              |
| metadata                             | {}                                                             |
| name                                 | test1                                                          |
| os-extended-volumes:volumes_attached | []                                                             |
| progress                             | 0                                                              |
| security_groups                      | default                                                        |
| status                               | ACTIVE                                                         |
| tenant_id                            | 52a0ee83fb524376bd603547aea415a3                               |
| updated                              | 2015-08-28T07:05:16Z                                           |
| user_id                              | bea64c5634ae4f079c1c69ed29a68242                               |
+--------------------------------------+----------------------------------------------------------------+