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[Simon O'Donovan <1018253@xxxxxxxxxxxxxxxxxx>]

CONFIRMED FOR: USSURI

** Changed in: nova
       Status: Expired => New

** Changed in: horizon
       Status: Invalid => New

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https://bugs.launchpad.net/bugs/1018253

Title:
  No error message prompt during attaching when mountpoint is occupied

Status in OpenStack Dashboard (Horizon):
  New
Status in OpenStack Compute (nova):
  New

Bug description:
  Correct me if I am wrong.
  When we attach a volume to an instance at the mountpoint /dev/vdb, I expect that there should be a error message prompt in horizon if /dev/vdb is already occupied by, for example, another instance. Currently there is no error message prompt.

  How to create this bug:
  1, Launch one instance.
  2. Create a first volume and a second volume.
  3. Attach the first volume to the instance at the mountpoint /dev/vdb  and succeed.
  3. Attach the second volume to the same instance at the same mountpoint /dev/vdb.

  Expected output:
  A message should tell user that the mountpoint is occupied, not available or something.

  Actual output:
  No message shows. The second volume is still available.

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