yahoo-eng-team team mailing list archive

[Mike Lowe <1729636@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

** Affects: nova
     Importance: Undecided
         Status: New

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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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