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
















Best Regards
Rambo
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