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[Tong Liu <lexuns@xxxxxxxxx>]

The tempest log above is the initial failure due to "resize to zero disk flavor is not allowed". Later I tried with more disk manually, and it still failed during migration. Please see below for more information.
nicira@htb-1n-eng-dhcp8:/opt/stack/horizon$ nova show tj-test-resize 
+--------------------------------------+----------------------------------------------------------------+
| Property                             | Value                                                          |
+--------------------------------------+----------------------------------------------------------------+
| OS-DCF:diskConfig                    | MANUAL                                                         |
| OS-EXT-AZ:availability_zone          | nova                                                           |
| OS-EXT-STS:power_state               | 1                                                              |
| OS-EXT-STS:task_state                | -                                                              |
| OS-EXT-STS:vm_state                  | active                                                         |
| OS-SRV-USG:launched_at               | 2016-03-18T23:57:51.000000                                     |
| OS-SRV-USG:terminated_at             | -                                                              |
| accessIPv4                           |                                                                |
| accessIPv6                           |                                                                |
| config_drive                         |                                                                |
| created                              | 2016-03-18T23:57:36Z                                           |
| flavor                               | m1.nano (42)                                                   |
| hostId                               | 74913a7ca3224c89c2db0e23a8e8c19f658768fb2a47f26240836120       |
| id                                   | 6a657875-fe4f-405d-9a50-d96d6cd1cd0a                           |
| image                                | cirros-0.3.3-x86_64-ESX (4939d898-cc68-432b-8067-ebfd2af82bb7) |
| key_name                             | -                                                              |
| metadata                             | {}                                                             |
| name                                 | tj-test-resize                                                 |
| net1 network                         | 192.168.1.26                                                   |
| os-extended-volumes:volumes_attached | []                                                             |
| progress                             | 0                                                              |
| security_groups                      | default                                                        |
| status                               | ACTIVE                                                         |
| tenant_id                            | e625475de6344113a6d22461402ead92                               |
| updated                              | 2016-03-18T23:57:51Z                                           |
| user_id                              | 049b6c47f3694a1ca7d3afceffbf3228                               |
+--------------------------------------+----------------------------------------------------------------+


then i resize it to a flavor with more ram and nothing different

nicira@htb-1n-eng-dhcp8:/opt/stack/horizon$ nova flavor-list
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| ID | Name      | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| 1  | m1.tiny   | 512       | 1    | 0         |      | 1     | 1.0         | True      |
| 2  | m1.small  | 2048      | 20   | 0         |      | 1     | 1.0         | True      |
| 3  | m1.medium | 4096      | 40   | 0         |      | 2     | 1.0         | True      |
| 4  | m1.large  | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
| 42 | m1.nano   | 64        | 0    | 0         |      | 1     | 1.0         | True      |
| 5  | m1.xlarge | 16384     | 160  | 0         |      | 8     | 1.0         | True      |
| 84 | m1.micro  | 128       | 0    | 0         |      | 1     | 1.0         | True      |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+


nicira@htb-1n-eng-dhcp8:/opt/stack/horizon$ nova resize --poll tj-test-resize m1.micro

Server resizing... 67% complete
Error resizing server
ERROR (InstanceInErrorState): <type 'NoneType'> can't be decoded

but i do not see any errors in n-cpu.log

the last thing i see it the 67% error but the instance is in error state

2016-03-19 00:01:55.225 ^[[00;32mDEBUG nova.virt.vmwareapi.vmops [^[[01
;36mreq-1c57a8b0-1447-4734-96c6-642bf761cb0c ^[[00;36mdemo
demo^[[00;32m] ^[[01;35m[instance: 6a657875-fe4f-405d-9a50-d96d6cd1cd0a]
^[[00;32mUpdating instance '6a657875-fe4f-405d-9a50-d96d6cd1cd0a'
progress to 67^[[00m ^[[00;33mfrom (pid=3702) _update_instance_progress
/opt/stack/nova/nova/virt/vmwareapi/vmops.py:1225^[[00m

** Changed in: nova
       Status: Invalid => New

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https://bugs.launchpad.net/bugs/1560210

Title:
  Resize server up failed when server's diskConfig option is Manual

Status in OpenStack Compute (nova):
  New

Bug description:
  In my setup, there are two type of hypervisors ESX and KVM. The server
  is on ESX host. But during resize, it failed as it is migrated from
  one host (i.e. ESX host) to another (i.e. KVM host).

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