[Bug 1369465] Re: nova resize doesn't resize(extend) rbd disk files when using rbd disk backend

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** Tags added: patch

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https://bugs.launchpad.net/bugs/1369465

Title:
  nova resize doesn't resize(extend) rbd disk files when using rbd disk
  backend

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) liberty series:
  Fix Committed
Status in nova package in Ubuntu:
  Confirmed

Bug description:
  [Impact]

   * Not able to resize rbd backed disk image.

  [Test Case]

  1 - boot an instance with rbd backed disk image
  2 - resize it
  3 - log into the VM
  4 - the disk is not enlarged without this patch

  [Regression Potential]

   * None

  
  tested with nova trunk commit eb860c2f219b79e4f4c5984415ee433145197570

  Configured Nova to use rbd disk backend

  nova.conf

  [libvirt]
  images_type=rbd

  instances booted successfully and instance disks are in rbd pools,
  when perform a nova resize  to an existing instance,  memory and CPU
  changed to be new flavors but instance disks size doesn't change

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