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[melanie witt <1391196@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1396965 ***
    https://bugs.launchpad.net/bugs/1396965

** This bug has been marked a duplicate of bug 1396965
   Add capability to detach root device volume of an instance, when in shutoff state

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https://bugs.launchpad.net/bugs/1391196

Title:
  Cannot detach root volume from instance (to attach a different volume)

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  In objection of https://review.openstack.org/#/c/75552/ I have use
  cases to be able to detach the (none-ephemeral) root volume from an
  instance/ a server to be able to attach a different volume.

  Using the following (undocumented?) request to replace the volume
  attachment isn't successful either:

   curl -i 'http://10.47.52.20:8774/v2/35c70d4fc1414f708a547a9a6ee179ad/servers/6ae98f88-e706-44de-91f3-8756f9ba7ef6/os-volume_attachments/f5e5e5f6-61ce-4601-a7c5-c09cf2392425' -X PUT -H "X-Auth-Project-Id: Demo" -H "User-Agent: python-novaclient" -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token: xxx" -d '{"volumeAttachment": {"volumeId": "401c6474-5d41-4bb7-a461-b20f64014003"}}'
  HTTP/1.1 202 Accepted
  Content-Type: text/html; charset=UTF-8
  Content-Length: 0

  in spite of the empty response not reporting any error. This request
  also doesn't work for non-boot volumes.

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