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[melanie witt <1755392@xxxxxxxxxxxxxxxxxx>]

This looks like a request for enhancement to pre-validate in the API
whether an ephemeral_gb resize down will fail later on in nova-compute
to fail faster for users. I think the challenge here is going to be that
resize down is allowed for shared storage, but not for local storage,
and I don't know if we have a way to check "if shared storage" in the
API.

** Changed in: nova
   Importance: Undecided => Wishlist

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

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https://bugs.launchpad.net/bugs/1755392

Title:
  resize fails with: "Unable to resize disk down" for ephemeral_gb

Status in OpenStack Compute (nova):
  Opinion

Bug description:
  env：openstack master branch

  step：
  1.admin user create flavor 
  Flavor Name：test1  VCPUs：1  RAM：256MB  Root Disk:5G	Ephemeral Disk：5G Swap Disk:5MB

  2.admin user create instance use flavor test1.

  3.admin user create a new flavor
  Flavor Name：test2  VCPUs：1  RAM：256MB  Root Disk:5G	Ephemeral Disk：4G Swap Disk:5MB
  （turn down  Ephemeral Disk）

  4.resize the instance choose flavor test2

  problem：
  1.resize the instance if ephemeral_gb turn down the nova-compute raise exception
  2.flavor no chnage but horizon no warning

   
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server [None req-2b01ccc1-f5b1-4a7e-8c07-6cf1f06a56e5 admin admin] Exception during message handling: ResizeError: Resize error: Unable to resize disk down.
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 220, in dispatch
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 190, in _do_dispatch
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/exception_wrapper.py", line 76, in wrapped
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     function_name, call_dict, binary)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     self.force_reraise()
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/exception_wrapper.py", line 67, in wrapped
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 186, in decorated_function
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     "Error: %s", e, instance=instance)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     self.force_reraise()
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 156, in decorated_function
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/utils.py", line 970, in decorated_function
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 214, in decorated_function
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     self.force_reraise()
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 202, in decorated_function
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 4288, in resize_instance
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     migration, image, disk_info, migration.dest_compute)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/usr/lib64/python2.7/contextlib.py", line 35, in __exit__
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     self.gen.throw(type, value, traceback)
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server   File "/opt/stack/nova/nova/compute/manager.py", line 7429, in _error_out_instance_on_exception
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server     raise error.inner_exception
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server ResizeError: Resize error: Unable to resize disk down.
  Mar 13 02:11:21 localhost.localdomain nova-compute[7792]: ERROR oslo_messaging.rpc.server 

  Analysis
  1.nova-compute no judge ephemeral_gb turn down
  2.in nova-api judge if ephemeral_gb turn down raise exception

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