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[Feodor Tersin <ftersin@xxxxxxxxxxx>]

Public bug reported:

If an instance is booted from a volume backed snapshot with
ephemeral(s), it cannot be resized down to a flawor with disk size is
lesser than original flavor disk size.

Steps to reproduce:

1 Prepare flavors
$ nova flavor-create t1.nano-2-e auto 64 2 1 --ephemeral 1
$ nova flavor-create t1.nano-1-e auto 64 1 1 --ephemeral 1

2 Prepare a volume backed snapshot
$ cinder create 2 --image-id cirros-0.3.4-x86_64-disk --name boot-vol
$ nova boot --boot-volume <boot-vol-id> --flavor t1.nano-2-e inst-1
$ nova image-create inst-1 snap-1

3 Boot an instace from the snapshot
$ nova boot --image snap-1 --flavor t1.nano-2-e inst-2

4 Resize the instance
$ nova resize inst-2 t1.nano-1-e

5 Check status of the instance
$ nova list

Expected status: VERIFY_RESIZE
Actual status: ACITVE

Environment:
DevStack on current (the last Nova commit a7efa47ec91479c6cc77087cd5b86d2bbf5a0654) Newton OpenStack.

n-cpu.log fragment:
------------
[req-4de3bbd2-a717-4f76-bca0-607573ae46b9 admin admin] Exception during message handling
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 133, in _process_incoming
    res = self.dispatcher.dispatch(message)
...
  File "/opt/stack/nova/nova/compute/manager.py", line 6464, in _error_out_instance_on_exception
    raise error.inner_exception
ResizeError: Resize error: Unable to resize disk down.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1596957

Title:
  Cannot resize down instance booted from volume backed snapshot with
  ephemeral

Status in OpenStack Compute (nova):
  New

Bug description:
  If an instance is booted from a volume backed snapshot with
  ephemeral(s), it cannot be resized down to a flawor with disk size is
  lesser than original flavor disk size.

  Steps to reproduce:

  1 Prepare flavors
  $ nova flavor-create t1.nano-2-e auto 64 2 1 --ephemeral 1
  $ nova flavor-create t1.nano-1-e auto 64 1 1 --ephemeral 1

  2 Prepare a volume backed snapshot
  $ cinder create 2 --image-id cirros-0.3.4-x86_64-disk --name boot-vol
  $ nova boot --boot-volume <boot-vol-id> --flavor t1.nano-2-e inst-1
  $ nova image-create inst-1 snap-1

  3 Boot an instace from the snapshot
  $ nova boot --image snap-1 --flavor t1.nano-2-e inst-2

  4 Resize the instance
  $ nova resize inst-2 t1.nano-1-e

  5 Check status of the instance
  $ nova list

  Expected status: VERIFY_RESIZE
  Actual status: ACITVE

  Environment:
  DevStack on current (the last Nova commit a7efa47ec91479c6cc77087cd5b86d2bbf5a0654) Newton OpenStack.

  n-cpu.log fragment:
  ------------
  [req-4de3bbd2-a717-4f76-bca0-607573ae46b9 admin admin] Exception during message handling
  Traceback (most recent call last):
    File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 133, in _process_incoming
      res = self.dispatcher.dispatch(message)
  ...
    File "/opt/stack/nova/nova/compute/manager.py", line 6464, in _error_out_instance_on_exception
      raise error.inner_exception
  ResizeError: Resize error: Unable to resize disk down.

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