Open Stack

On Mon, Sep 10, 2018 at 2:22 PM Jay S Bryant <jungleboyj at gmail.com> wrote:

>
>
> On 9/10/2018 7:17 AM, Rambo wrote:
>
> Hi,all
>
>       At first,I find it is supported that we can define hard performance
> limits for each volume in doc.openstack.org[1].But only can define hard
> performance limits for each volume type in fact. Another, the note"As of
> the Nova 18.0.0 Rocky release, front end QoS settings are only supported
> when using the libvirt driver.",in fact, we have supported the front end
> QoS settings when using the libvirt driver previous. Is the document
> wrong?Can you tell me more about this ?Thank you very much.
>
> [1]
> https://docs.openstack.org/cinder/latest/admin/blockstorage-basic-volume-qos.html
>
>
>
> Rambo,
>
> The performance limits are limited to a volume type as you need to have a
> volume type to be able to associate a QoS type with it.  So, that makes
> sense.
>
> As for the documentation, it is a little confusing the way that is worded
> but it isn't wrong.  So, QoS support thus far, including Nova 18.0.0, front
> end QoS setting only works with the libvirt driver.  I don't interpret that
> as meaning that there wasn't QoS support before that.
>
Right, the point is that now it's listed as supported ONLY on libvirt, as
opposed to in the past it may have been supported on other hypervisors like
hyper-v, xen etc.  I don't know any of the details around how well those
other implementations worked or what decisions were made but I just read
the update as noting that currently only libvirt is supported, but not that
anything has changed there.

>
> Jay
>
>
>
>
>
>
> Best Regards
> Rambo
>
>
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