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<div class="moz-cite-prefix">On 9/10/2018 7:17 AM, Rambo wrote:<br>
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cite="mid:tencent_57CB31AB044BD33A17684817@qq.com">
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<div>Hi,all</div>
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<div> At first,I find it is supported that we can <span
style="color: rgb(51, 51, 51); font-family: -apple-system,
system-ui, "Segoe UI", Roboto, Oxygen-Sans,
Ubuntu, Cantarell, "Helvetica Neue", sans-serif;">define
hard performance limits for each volume</span> in
doc.openstack.org[1].But only can <span style="color: rgb(51,
51, 51); font-family: -apple-system, system-ui, "Segoe
UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell,
"Helvetica Neue", sans-serif;">define hard
performance limits for each volume type</span> in fact.
Another, the note"<span style="background-color: rgb(237, 242,
247); color: rgb(42, 78, 104); font-family: -apple-system,
system-ui, "Segoe UI", Roboto, Oxygen-Sans,
Ubuntu, Cantarell, "Helvetica Neue", sans-serif;">As
of the Nova 18.0.0 Rocky release, front end QoS settings are
only supported when using the libvirt driver.</span>",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.</div>
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<div>[1]<a class="moz-txt-link-freetext" href="https://docs.openstack.org/cinder/latest/admin/blockstorage-basic-volume-qos.html">https://docs.openstack.org/cinder/latest/admin/blockstorage-basic-volume-qos.html</a></div>
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Rambo,<br>
<br>
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.<br>
<br>
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.<br>
<br>
Jay<br>
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<div>Best Regards</div>
<div>Rambo</div>
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