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[Bug 1201863] Re: XenAPI Resize Fails with Migration Error: Failed to transfer vhd to new host

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Bob Ball <1201863@xxxxxxxxxxxxxxxxxx>
Date: Tue, 17 May 2016 13:55:17 -0000
Reply-to: Bug 1201863 <1201863@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
No current plans to fix this; use live migration not resize

** Changed in: nova
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1201863

Title:
  XenAPI Resize Fails with Migration Error: Failed to transfer vhd to
  new host

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  Setup:
  OpenStack Grizzly and XCP on Debian Wheezy from the repositories (Kronos).
  Shared storage based on NFS as the default SR configured for live migration.

  When pressing the "More->Migrate Instance" on Horizon web interface, a
  resize is initiated (Migrate here is misleading since it's basically
  resize but this is another thing) which always fails with the
  following errors:

  2013-07-16 17:49:35.684 ERROR nova.compute.manager [req-7a04e85c-0663-4772-bb5b-006516bde71f 8ca2f0ccd55f4d9ba53847755f2e0b18 10c16ce5ffb54c56925152b7d331a8d2] [instance: 93cb5f1a-5f63-4ac0-b7f4-77ee8e976484] Migration error: Failed to transfer vhd to new host. Setting instance vm_state to ERROR
  2013-07-16 17:49:41.862 ERROR nova.openstack.common.rpc.amqp [req-7a04e85c-0663-4772-bb5b-006516bde71f 8ca2f0ccd55f4d9ba53847755f2e0b18 10c16ce5ffb54c56925152b7d331a8d2] Exception during message handling
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp Traceback (most recent call last):
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 430, in _process_data
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     rval = self.proxy.dispatch(ctxt, version, method, **args)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/dispatcher.py", line 133, in dispatch
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     return getattr(proxyobj, method)(ctxt, **kwargs)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 117, in wrapped
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     temp_level, payload)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     self.gen.next()
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 94, in wrapped
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     return f(self, context, *args, **kw)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 209, in decorated_function
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     pass
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     self.gen.next()
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 195, in decorated_function
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     return function(self, context, *args, **kwargs)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 260, in decorated_function
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     function(self, context, *args, **kwargs)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 237, in decorated_function
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     e, sys.exc_info())
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     self.gen.next()
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 224, in decorated_function
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     return function(self, context, *args, **kwargs)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2373, in resize_instance
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     block_device_info)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/driver.py", line 243, in migrate_disk_and_power_off
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     dest, instance_type)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/vmops.py", line 905, in migrate_disk_and_power_off
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     context, instance, dest, vm_ref, sr_path)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/vmops.py", line 850, in _migrate_disk_resizing_up
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     self._migrate_vhd(instance, vdi_uuid, dest, sr_path, seq_num)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/vmops.py", line 765, in _migrate_vhd
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp     raise exception.MigrationError(reason=msg)
  2013-07-16 17:49:41.862 5363 TRACE nova.openstack.common.rpc.amqp MigrationError: Migration error: Failed to transfer vhd to new host

  
  Exactly the same happens when I try to resize an instance from the command line (either up or down)

  ~# nova resize <image-id> m1.small --poll
  Instance resizing... 40% complete
  Error resizing instance

  I assume it might be because of the shared storage? 
  Anyway it's a bug which puts the VM in ERROR state so it should be handled properly.

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