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[s10 <1803575@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========

Currently virtio-scsi is used only for libvirt instances created from
the images with properties hw_scsi_model=virtio-scsi and
hw_disk_bus=scsi set or from the volumes with the same image metadata.

What is requested: config option in [libvirt] section of the nova.conf
to enable virtio-scsi for all new instances by default, even if
hw_scsi_model and hw_disk_bus properties for the image is not set.

Why: we want virtio-scsi to be enabled for VMs created from users images
even if they don't set this property explicitly, because we want to have
most of the vms be able to issue BLKDISCARD with fstrim.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1803575

Title:
  RFE: Add an option to enable virtio-scsi for new Nova instances by
  default

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========

  Currently virtio-scsi is used only for libvirt instances created from
  the images with properties hw_scsi_model=virtio-scsi and
  hw_disk_bus=scsi set or from the volumes with the same image metadata.

  What is requested: config option in [libvirt] section of the nova.conf
  to enable virtio-scsi for all new instances by default, even if
  hw_scsi_model and hw_disk_bus properties for the image is not set.

  Why: we want virtio-scsi to be enabled for VMs created from users
  images even if they don't set this property explicitly, because we
  want to have most of the vms be able to issue BLKDISCARD with fstrim.

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