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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => liberty-1

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https://bugs.launchpad.net/bugs/1438245

Title:
   Nova accesses image for resize even when resize is disabled

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  The resize_fs_using_block_device config option allows to configure if
  a filesystem within an image is resized by nova during spawn or not.
  When it's set to False (which is the default) nova still tries to
  access the image to find out if it's extendable or not, although it's
  not resized afterwards.

  On system which don't have libguestfs or nbd installed, this causes
  the following error messages repeatedly:

  2015-03-30 16:49:40.326 ERROR nova.virt.disk.mount.nbd [req-3d3c5a50-6067-442a-9607-1f98141d795c None None] nbd module not loaded
  2015-03-30 16:49:40.327 INFO nova.virt.disk.mount.api [req-3d3c5a50-6067-442a-9607-1f98141d795c None None] Device allocation failed. Will retry in 2 seconds.
  2015-03-30 16:49:42.329 ERROR nova.virt.disk.mount.nbd [req-3d3c5a50-6067-442a-9607-1f98141d795c None None] nbd module not loaded
  2015-03-30 16:49:42.330 INFO nova.virt.disk.mount.api [req-3d3c5a50-6067-442a-9607-1f98141d795c None None] Device allocation failed. Will retry in 2 seconds.
  2015-03-30 16:49:44.332 ERROR nova.virt.disk.mount.nbd [req-3d3c5a50-6067-442a-9607-1f98141d795c None None] nbd module not loaded
  2015-03-30 16:49:44.333 INFO nova.virt.disk.mount.api [req-3d3c5a50-6067-442a-9607-1f98141d795c None None] Device allocation failed. Will retry in 2 seconds.

  So the instance spawn takes longer than necessary (retries are done
  for ~30 seconds).

  I'll provide a patch to make sure the image is not accessed when
  resizing is disabled.

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