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[Sofia Enriquez <2002535@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2002535

Title:
  [NFS] Server resize failed when image volume cache enabled

Status in Cinder:
  New
Status in OpenStack Compute (nova):
  New

Bug description:
  Description: When resizing an instance, an error is thrown to the
  user:

  Error resizing server: 17a238f3-01be-490c-97c8-35f47c804624
  Error resizing server

  Steps to reproduce: 
  1.  Create a bootable volume from an existing image
  openstack volume create --image cirros-0.5.2-x86_64-disk --size 1 --bootable volboot
  2.  Create an instance attached to that volume
  openstack server create --flavor m1.small --volume volboot --network public  server1
  3.  Resize the server
  openstack server resize --flavor m1.medium --wait server1

  In the nova compute logfile, we can see an error which refers to the disk format
  .
  Jan 10 20:29:09 e2e-os-pstorenfs105 nova-compute[3362105]: ERROR oslo_messaging.rpc.server libvirt.libvirtError: internal error: process exited while connecting to monitor: 2023-01-10T12:29:08.542757Z qemu-system-x86_64: -blockdev {"node-name":"libvirt-1-format","read-only":false,"cache":

  {"direct":true,"no-flush":false}

  ,"driver":"qcow2","file":"libvirt-1-storage","backing":null}: Image is
  not in qcow2 format

  
  After a first analysis, it seems that during the creation of the volume, qemu-img convert qcow2 file format to raw and never converts it back to qcow2. Attachement information then mistmatches and server resize is failing.

  It's an NFS environment.

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