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[OpenStack Hudson <1044237@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: master
Review: https://review.openstack.org/12784

** Changed in: nova
     Assignee: Sina Web Service Dev (sws) => Jian Wen (wenjianhn)

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https://bugs.launchpad.net/bugs/1044237

Title:
  Block Migration doesn't work: Nova searches for the Instance on the
  destination Compute host

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  I am trying to perform block migration using a recent Devstack installation, with Nova folsom-rc1
  but it's not working.
  Commit ID: commit 4adbb96b5530184e3f42047a7416d6f315a14150

  Issue: Nova searches for the instance to migrate, but on the
  destination host, and fails as it could not be found.

  Here's my setup:
  --------------------------

  Host 1:  ubuntu-devstack1 - Destination host
  Controller node running Nova, Keystone, Quantum and Glance (n-api, n-cpu, n-sch, q-agt, q-svc, g-api, g-reg, key)

  Host 2: ubuntu-devstack2  - Source host
  Compute node running Compute and Quantum Agent (n-cpu, q-agt)

  Both hosts are Ubuntu Oneric, time synced, and resolvable to each
  other using hostnames.

  Steps: 
  1. Spawn an instance - Scheduler spawns it successfully on Host 2 (ubuntu-devstack2), and stays ACTIVE.
  2. Perform block migration.

  rohit@ubuntu-devstack1:~/devstack$ nova live-migration --block_migrate fdd7f23e-427d-478d-af61-c7bd6c9d6b91  ubuntu-devstack1
  (Here, my source=ubuntu-devstack2, and destination=ubuntu-devstack1)

  ERROR: Live migration of instance fdd7f23e-427d-478d-af61-c7bd6c9d6b91
  to host ubuntu-dev-stack-vertex failed (HTTP 400) (Request-ID: req-
  a13bf2ad-8be7-43b8-9a07-441c18e7009d)

  3. Compute log on source -  No logs generated after running the command
  4. Compute log on destination - http://paste.openstack.org/show/20593/

  It seems nova is looking for the instance on the destination host.

  A check for 'virsh list' on both source and destination showed the
  correct output, instance was listed on the source (ubuntu-devstack2)
  and did not list on the destination (ubuntu-devstack1).

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