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[Oisin <oisin.omalley@xxxxxxxxxxxxx>]

Public bug reported:

After a migration (offline) or resize is performed the instance path
/var/lib/nova/instances/<INSTANCE_ID> isn't correctly deleted and a
/var/lib/nova/instances/<INSTANCE_ID>/disk.info is created. If the
instance is subsequently live migrated back to the original Compute node
the live migration will fail with an error similar to

DestinationDiskExists: The supplied disk path (/var/lib/nova/instances/b50aea7a-7cc5-4216-9ce6-a447d5e2c
6b3) already exists, it is expected not to exist.

The instance directory is initially deleted after the offline migration
completes but then gets recreated containing the disk.info once the
migration is confirmed buy the user.

I've seen a similar DestinationDiskExists Exception get raised when only
live migrations have occurred previously but haven't been able to
recreate as the directory is deleted once the exception is raised.

We are using Nova 14.0.2 from OpenStack Newton.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1686262

Title:
  Instance Path Not Deleted After Migration

Status in OpenStack Compute (nova):
  New

Bug description:
  After a migration (offline) or resize is performed the instance path
  /var/lib/nova/instances/<INSTANCE_ID> isn't correctly deleted and a
  /var/lib/nova/instances/<INSTANCE_ID>/disk.info is created. If the
  instance is subsequently live migrated back to the original Compute
  node the live migration will fail with an error similar to

  DestinationDiskExists: The supplied disk path (/var/lib/nova/instances/b50aea7a-7cc5-4216-9ce6-a447d5e2c
  6b3) already exists, it is expected not to exist.

  The instance directory is initially deleted after the offline
  migration completes but then gets recreated containing the disk.info
  once the migration is confirmed buy the user.

  I've seen a similar DestinationDiskExists Exception get raised when
  only live migrations have occurred previously but haven't been able to
  recreate as the directory is deleted once the exception is raised.

  We are using Nova 14.0.2 from OpenStack Newton.

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