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[sean mooney <2013123@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

nova added support for discard aka trim in mitaka when a cinder backend
reports it's supported. At the time Qemu did not support trim/discard
when using virtio-blk. This gap was adressed in qemu 4.0.0 however we never adapted nova to allow
trim when using virtio-blk. nova raised its min qemu version to 4.0.0 in Ussuri.
As such this should be supported in all nova deployment from Ussuri on but it is still blocked on master today.

** Affects: nova
     Importance: Undecided
     Assignee: sean mooney (sean-k-mooney)
         Status: New


** Tags: cinder libvirt volumes

** Changed in: nova
     Assignee: (unassigned) => sean mooney (sean-k-mooney)

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https://bugs.launchpad.net/bugs/2013123

Title:
  nova blocks discard with virtio-blk

Status in OpenStack Compute (nova):
  New

Bug description:
  nova added support for discard aka trim in mitaka when a cinder backend
  reports it's supported. At the time Qemu did not support trim/discard
  when using virtio-blk. This gap was adressed in qemu 4.0.0 however we never adapted nova to allow
  trim when using virtio-blk. nova raised its min qemu version to 4.0.0 in Ussuri.
  As such this should be supported in all nova deployment from Ussuri on but it is still blocked on master today.

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