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[Chris DeVita <1796981@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Problem Description: Nova evacuate <instance_id> <target_host_name>
fails, instances reported in ERROR state after executing “nova evacuate”

Summary: A instance with its boot volume on a shared storage device ( HP
3Par or SUSE CEPH cluster ) errors out during a evacuate. By making a
code change to catch the error dereferencing vol_stats in
nova/compute/manager.py the error can be avoided.

Included: 
* Steps to produce it
* nova evacuate with --debug 
* Command line output showing the state of the VM before and after the evacuate
* code that was changed 
* Command line output showing the successful state of the VM before and after the evacuate

** Affects: nova
     Importance: Undecided
         Status: New

** Attachment added: "bugreport.txt"
   https://bugs.launchpad.net/bugs/1796981/+attachment/5199273/+files/bugreport.txt

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https://bugs.launchpad.net/bugs/1796981

Title:
  nova/compute/manager.py throws TypeError: 'NoneType' object is not
  iterable

Status in OpenStack Compute (nova):
  New

Bug description:
  Problem Description: Nova evacuate <instance_id> <target_host_name>
  fails, instances reported in ERROR state after executing “nova
  evacuate”

  Summary: A instance with its boot volume on a shared storage device (
  HP 3Par or SUSE CEPH cluster ) errors out during a evacuate. By making
  a code change to catch the error dereferencing vol_stats in
  nova/compute/manager.py the error can be avoided.

  Included: 
  * Steps to produce it
  * nova evacuate with --debug 
  * Command line output showing the state of the VM before and after the evacuate
  * code that was changed 
  * Command line output showing the successful state of the VM before and after the evacuate

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