Comment 3 for bug 1560210

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