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[Sean Dague <sean@xxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1489226

Title:
  Nova should support specifying the block devices(/dev/sd*) name to
  attach to the instance

Status in OpenStack Compute (nova):
  Opinion

Bug description:
  nova and horizon dashboard should support that specify the block devices(e.g. /dev/sd*) to attach to an instance. Users can type the block devices(e.g. /dev/sd*)  to attach to the instance and the instance can map the block devices(e.g. /dev/sd*) with a symlink(e.g. /dev/sd*   -> ../../xvd*), and the horizon dashboard can display this symlink relation to users.
  e.g.:
  Instance: /dev/sd*   -> ../../xvd*
  Dashboard: /dev/sd* ---- vol-xxxxxx ---- /dev/xvd*

  While Amazon EC2 has supported this function very well.

  In the EC2 Attach Volume dialog box, start typing the name or ID of
  the instance to attach the volume to in the Instance box, and select
  it from the list of suggestion options (only instances in the same
  Availability Zone as the volume are displayed).

  Device names like /dev/sdh and xvdh are used by Amazon EC2 to describe
  block devices, the block device mapping is used by Amazon EC2 to
  specify the block devices to attach to an EC2 instance.

  Please refer to the following picture for detail.
  http://www.bogotobogo.com/DevOps/AWS/images/AttachingVolume/AttachVolumeMenu.png
  http://www.bogotobogo.com/DevOps/AWS/images/AttachingVolume/AttachVolumeDialog.png
  http://www.bogotobogo.com/DevOps/AWS/images/AttachingVolume/bogo-ami_Instance_with_new_volume.png

  The same hit the Horizon:
  https://bugs.launchpad.net/horizon/+bug/1489227

  Best Regards,
  Sibiao Luo

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