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[Feodor Tersin <ftersin@xxxxxxxxxxx>]

Well,  if all you guys say this is not a bug, it's not a bug. But it's
sadly that Nova cannot guarantee device names even in this simple case.

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

** Changed in: nova
     Assignee: Feodor Tersin (ftersin) => (unassigned)

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https://bugs.launchpad.net/bugs/1489442

Title:
  Invalid order of volumes with adding a volume in boot operation

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  If an image has several volume in bdm, and a user adds one more volume
  for boot operation, then the new volume is not just added to a volume
  list, but becomes the second device. This can lead to problems if the
  image root device has various soft which settings point to other
  volumes.

  For example:
  1 the image is a snapshot of a volume backed instance which had vda and vdb volumes
  2 the instance had an sql server, which used both vda and vdb for its database
  3 if a user runs a new instance from the image, either device names are restored (with xen), or they're reassigned (libvirt) to the same names, because the order of devices, which are passed in libvirt, is the same as it was for the original instance
  4 if a user runs a new instance, adding a new volume, the volume list becomes vda, new, vdb
  5 in this case libvirt reassings device names to vda=vda, new=vdb, vdb=vdc
  6 as a result the sql server will not find its data on vdb

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