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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

*** This bug is a duplicate of bug 1727558 ***
    https://bugs.launchpad.net/bugs/1727558

This was recently fixed and backported to stable/ocata:

https://github.com/openstack/nova/commit/fc10b54f25023d7e780b110928bda3a19e4c03f0


** Tags added: libvirt

** This bug has been marked a duplicate of bug 1727558
   libvirt driver ignores 'disk_cachemodes' configuration setting

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https://bugs.launchpad.net/bugs/1729636

Title:
  Inconsistent xml for libvirt disks

Status in OpenStack Compute (nova):
  New

Bug description:
  With both of these settings the xml is not consistent between root
  disks and volumes when using RBD.

  hw_disk_discard = unmap
  disk_cachemodes = network=writeback

  Root disks get this:
        <driver name='qemu' type='raw' cache='none' discard='unmap'/>
  Volumes get this:
        <driver name='qemu' type='raw' cache='writeback'/>

  Both have the same type (<disk type='network' device='disk'>) but the
  settings are not applied consistently between volumes and root disks.

  nova: 15.0.7
  CentOS: 7.4
  libvirt: 3.2.0
  Ceph: 12.2.1

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