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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.

Jay

>
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>
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> Best Regards
> Rambo
>
>
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