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["ChangBo Guo\(gcb\)" <glongwave@xxxxxxxxx>]

Public bug reported:

We support  instance disk IO control through libvirt  domain element <iotune> like:
      <iotune>
        <total_bytes_sec>102400</total_bytes_sec>
      </iotune>

Abstract class Image's method  libvirt_info  set the iotune values from instance extra_specs. 
see  https://github.com/openstack/nova/blob/master/nova/virt/libvirt/imagebackend.py#L164

Class Rbd overwrite the method libvirt_info  and doesn't add  the logic of adding disk IO control.
see https://github.com/openstack/nova/blob/master/nova/virt/libvirt/imagebackend.py#L674

we need fix that.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1461414

Title:
  Missing  instance disk IO control for rbd backend

Status in OpenStack Compute (Nova):
  New

Bug description:
  We support  instance disk IO control through libvirt  domain element <iotune> like:
        <iotune>
          <total_bytes_sec>102400</total_bytes_sec>
        </iotune>

  Abstract class Image's method  libvirt_info  set the iotune values from instance extra_specs. 
  see  https://github.com/openstack/nova/blob/master/nova/virt/libvirt/imagebackend.py#L164

  Class Rbd overwrite the method libvirt_info  and doesn't add  the logic of adding disk IO control.
  see https://github.com/openstack/nova/blob/master/nova/virt/libvirt/imagebackend.py#L674

  we need fix that.

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