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[Bug 1450471] Re: live-migration fails on shared storage with "Cannot block migrate"

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1450471@xxxxxxxxxxxxxxxxxx>
Date: Mon, 19 Oct 2015 04:17:22 -0000
Reply-to: Bug 1450471 <1450471@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1450471

Title:
  live-migration fails on shared storage with "Cannot block migrate"

Status in OpenStack Compute (nova):
  Expired

Bug description:
  Kilo RC from Ubuntu Cloudarchive for trusty. Patches
  https://review.openstack.org/174307 and
  https://review.openstack.org/174059 are applied manually without which
  live-migration fails due to parameter changes.

  KVM, libvirt, 4 compute hosts, a 9 host ceph cluster for shared storage. Newly created instances work fine on all computes. When initiating live-migrate either from Horizon or from CLI, status switches back from MIGRATING very fast but VM stays on original host. Message
  MigrationError: Migration error: Cannot block migrate instance 53d225ac-1915-4cff-8f15-54b5c66c20a3 with mapped volumes
  is found in log of compute host.

  Block-Migration option is explicitly not set, setting it for a try
  causes a different error message earlier.

  Pkg-Versions:
  ii  nova-common                         1:2015.1~rc1-0ubuntu1~cloud0          all          OpenStack Compute - common files
  ii  nova-compute                        1:2015.1~rc1-0ubuntu1~cloud0          all          OpenStack Compute - compute node base
  ii  nova-compute-kvm                    1:2015.1~rc1-0ubuntu1~cloud0          all          OpenStack Compute - compute node (KVM)
  ii  nova-compute-libvirt                1:2015.1~rc1-0ubuntu1~cloud0          all          OpenStack Compute - compute node libvirt support

  
  Full log:

  
  2015-04-30 13:42:46.985 17619 ERROR nova.compute.manager [req-ecbf0446-079a-45db-9000-539f06a9e9e4 382e4cb7197e43bf9b11fc1c6fa9d692 9984ba4fc07c475e84a109967a897e4e - - -] [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] Pre live migration failed at compute04
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] Traceback (most recent call last):
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 5217, in live_migration
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     block_migration, disk, dest, migrate_data)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/compute/rpcapi.py", line 621, in pre_live_migration
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     disk=disk, migrate_data=migrate_data)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/client.py", line 156, in call
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     retry=self.retry)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_messaging/transport.py", line 90, in _send
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     timeout=timeout, retry=retry)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 350, in send
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     retry=retry)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 341, in _send
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     raise result
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] MigrationError_Remote: Migration error: Cannot block migrate instance 53d225ac-1915-4cff-8f15-54b5c66c20a3 with mapped volumes
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] Traceback (most recent call last):
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     executor_callback))
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     executor_callback)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     result = func(ctxt, **new_args)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 6676, in pre_live_migration
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     disk, migrate_data=None)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 440, in decorated_function
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     return function(self, context, *args, **kwargs)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     payload)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     six.reraise(self.type_, self.value, self.tb)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     return f(self, context, *args, **kw)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 352, in decorated_function
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     kwargs['instance'], e, sys.exc_info())
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     six.reraise(self.type_, self.value, self.tb)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 340, in decorated_function
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     return function(self, context, *args, **kwargs)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 5159, in pre_live_migration
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     migrate_data)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 5825, in pre_live_migration
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3]     raise exception.MigrationError(reason=msg)
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] MigrationError: Migration error: Cannot block migrate instance 53d225ac-1915-4cff-8f15-54b5c66c20a3 with mapped volumes
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:46.985 17619 TRACE nova.compute.manager [instance: 53d225ac-1915-4cff-8f15-54b5c66c20a3] 
  2015-04-30 13:42:47.124 17619 ERROR oslo_messaging.rpc.dispatcher [req-ecbf0446-079a-45db-9000-539f06a9e9e4 382e4cb7197e43bf9b11fc1c6fa9d692 9984ba4fc07c475e84a109967a897e4e - - -] Exception during message handling: Migration error: Cannot block migrate instance 53d225ac-1915-4cff-8f15-54b5c66c20a3 with mapped volumes
  Traceback (most recent call last):

    File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
      executor_callback))

    File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
      executor_callback)

    File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
      result = func(ctxt, **new_args)

    File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 6676, in pre_live_migration
      disk, migrate_data=None)

    File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 440, in decorated_function
      return function(self, context, *args, **kwargs)

    File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
      payload)

    File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
      six.reraise(self.type_, self.value, self.tb)

    File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
      return f(self, context, *args, **kw)

    File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 352, in decorated_function
      kwargs['instance'], e, sys.exc_info())

    File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
      six.reraise(self.type_, self.value, self.tb)

    File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 340, in decorated_function
      return function(self, context, *args, **kwargs)

    File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 5159, in pre_live_migration
      migrate_data)

    File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 5825, in pre_live_migration
      raise exception.MigrationError(reason=msg)

  MigrationError: Migration error: Cannot block migrate instance 53d225ac-1915-4cff-8f15-54b5c66c20a3 with mapped volumes
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 6663, in live_migration
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     migrate_data=migrate_data)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     payload)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 352, in decorated_function
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     kwargs['instance'], e, sys.exc_info())
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 340, in decorated_function
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 5225, in live_migration
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     block_migration, migrate_data)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 5217, in live_migration
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     block_migration, disk, dest, migrate_data)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/rpcapi.py", line 621, in pre_live_migration
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     disk=disk, migrate_data=migrate_data)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/client.py", line 156, in call
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     retry=self.retry)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/transport.py", line 90, in _send
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     timeout=timeout, retry=retry)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 350, in send
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     retry=retry)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 341, in _send
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     raise result
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher MigrationError_Remote: Migration error: Cannot block migrate instance 53d225ac-1915-4cff-8f15-54b5c66c20a3 with mapped volumes
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 6676, in pre_live_migration
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     disk, migrate_data=None)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 440, in decorated_function
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     payload)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 352, in decorated_function
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     kwargs['instance'], e, sys.exc_info())
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 340, in decorated_function
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 5159, in pre_live_migration
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     migrate_data)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 5825, in pre_live_migration
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher     raise exception.MigrationError(reason=msg)
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher MigrationError: Migration error: Cannot block migrate instance 53d225ac-1915-4cff-8f15-54b5c66c20a3 with mapped volumes
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher 
  2015-04-30 13:42:47.124 17619 TRACE oslo_messaging.rpc.dispatcher

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References

[Bug 1450471] [NEW] live-migration fails on shared storage with "Cannot block migrate"
From: René Gallati, 2015-04-30