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

[Edmund Rhudy]

Jorge is reporting it on my behalf; the error occurs for me with
images_type=lvm. images_type=rbd is fine.

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

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive liberty series:
  Fix Released
Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) liberty series:
  Fix Committed
Status in nova package in Ubuntu:
  Fix Released
Status in nova source package in Wily:
  Won't Fix

Bug description:
  [Impact]

    Instance resize does not work if the target host has a cached copy of
    the root disk. The resize will silently fail but be displayed as
    successful in Nova.

  [Test Case]

    1 deploy nova-compute with RBDImageBackend enabled
    2 boot an instance from a QCOW2 image (to guarantee it gets downloaded for reformat prior to re-upload to ceph)
    3 nova resize using flavor with larger root disk
    4 wait for instance resize migration to complete
    5 verify root disk actually resized by checking /proc/partitions in vm
    6 do nova resize-confirm
    7 repeat steps 3-6

  [Regression Potential]

   * None

  == original description below ==

  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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