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[YaoZheng_ZTE <zheng.yao1@xxxxxxxxxx>]

Public bug reported:

1、 Live migration of volume backed instances
2、at pre_live_migration function,  the table of block_device_mapping has been updated as destination  host volume lun information
3、at /nova/compute/manager.py  _post_live_migration function， when call  the funfunction 
     block_device_info = self._get_instance_block_device_info( ctxt, instance, bdms) , because the  Parameters is incorrect , the 
     table of block_device_mapping will be changed as the source host volume lun information. 
4、the next step ,when run the function /nova/compute/manager.py  post_live_migration_at_destination ,will query volume lun connection from the table of block_device_mapping, but  the table has been updated as  source host volume lun information,so
the destination  host  run the under function will failed. :
          self.volume_driver_method('connect_volume',
                                               connection_info,
                                               disk_dev)

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1402477

Title:
   Live migration of volume backed instances broken because  the table
  of block_device_mapping was updated incorrect

Status in OpenStack Compute (Nova):
  New

Bug description:
  1、 Live migration of volume backed instances
  2、at pre_live_migration function,  the table of block_device_mapping has been updated as destination  host volume lun information
  3、at /nova/compute/manager.py  _post_live_migration function， when call  the funfunction 
       block_device_info = self._get_instance_block_device_info( ctxt, instance, bdms) , because the  Parameters is incorrect , the 
       table of block_device_mapping will be changed as the source host volume lun information. 
  4、the next step ,when run the function /nova/compute/manager.py  post_live_migration_at_destination ,will query volume lun connection from the table of block_device_mapping, but  the table has been updated as  source host volume lun information,so
  the destination  host  run the under function will failed. :
            self.volume_driver_method('connect_volume',
                                                 connection_info,
                                                 disk_dev)

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