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[Maxim Korezkij <1964576@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I found two block device mappings (bdm) for a volume (mulitattach is
off). Also I am not quite sure where the second bdm is coming from.
Additionaly one of the bdm has no attachment_id.

When detaching the volume it is possible that nova deletes the wrong
attachment, because it assumes that there should be just one attachment
when multiattach is turned off (which makes sense).

The fix i propose should prevent the deletion of the attachment when it
is unclear how many attachments there are.

** Affects: nova
     Importance: Undecided
         Status: In Progress

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https://bugs.launchpad.net/bugs/1964576

Title:
  handle volume attachments

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  I found two block device mappings (bdm) for a volume (mulitattach is
  off). Also I am not quite sure where the second bdm is coming from.
  Additionaly one of the bdm has no attachment_id.

  When detaching the volume it is possible that nova deletes the wrong
  attachment, because it assumes that there should be just one
  attachment when multiattach is turned off (which makes sense).

  The fix i propose should prevent the deletion of the attachment when
  it is unclear how many attachments there are.

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