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[Tony Walker <1445637@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I'm using a nova built from stable/kilo and trying to implement instance
IO resource quotas for disk as per
https://wiki.openstack.org/wiki/InstanceResourceQuota#IO.

While this works when building an instance from ephemeral storage, it
does not when booting from a bootable cinder volume. I realize I can
implement this using cinder quota but I want to apply the same settings
in nova regardless of the underlying disk.

Steps to produce:

nova flavor-create iolimited 1 8192 64 4
nova flavor-key 1 set quota:disk_read_iops_sec=10000
Boot an instance using the above flavor
Guest XML is missing <iotune> entries

Expected result:
<snip>
      <target dev='vda' bus='virtio'/>
      <iotune>
        <read_iops_sec>10000</read_iops_sec>
      </iotune>
</snip>

This relates somewhat to https://bugs.launchpad.net/nova/+bug/1405367
but that case is purely hit when booting from RBD-backed ephemeral
storage.

Essentially, for non-ephemeral disks, a call is made to
_get_volume_config() which creates a generic LibvirtConfigGuestDisk
object but no further processing is done to add extra-specs (if any).

I've essentially copied the disk_qos() method from the associated code
review (https://review.openstack.org/#/c/143939/) to implement my own
patch (attached).

** Affects: nova
     Importance: Undecided
         Status: New

** Patch added: "driver.patch"
   https://bugs.launchpad.net/bugs/1445637/+attachment/4378673/+files/driver.patch

** Patch removed: "driver.patch"
   https://bugs.launchpad.net/nova/+bug/1445637/+attachment/4378673/+files/driver.patch

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https://bugs.launchpad.net/bugs/1445637

Title:
  Instance resource quota not observed for non-ephemeral storage

Status in OpenStack Compute (Nova):
  New

Bug description:
  I'm using a nova built from stable/kilo and trying to implement
  instance IO resource quotas for disk as per
  https://wiki.openstack.org/wiki/InstanceResourceQuota#IO.

  While this works when building an instance from ephemeral storage, it
  does not when booting from a bootable cinder volume. I realize I can
  implement this using cinder quota but I want to apply the same
  settings in nova regardless of the underlying disk.

  Steps to produce:

  nova flavor-create iolimited 1 8192 64 4
  nova flavor-key 1 set quota:disk_read_iops_sec=10000
  Boot an instance using the above flavor
  Guest XML is missing <iotune> entries

  Expected result:
  <snip>
        <target dev='vda' bus='virtio'/>
        <iotune>
          <read_iops_sec>10000</read_iops_sec>
        </iotune>
  </snip>

  This relates somewhat to https://bugs.launchpad.net/nova/+bug/1405367
  but that case is purely hit when booting from RBD-backed ephemeral
  storage.

  Essentially, for non-ephemeral disks, a call is made to
  _get_volume_config() which creates a generic LibvirtConfigGuestDisk
  object but no further processing is done to add extra-specs (if any).

  I've essentially copied the disk_qos() method from the associated code
  review (https://review.openstack.org/#/c/143939/) to implement my own
  patch (attached).

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