Hi, With Ceph as the backend, we use Cinder’s QoS feature to limit IOPS on users’ volumes: http://ceph.com/planet/openstack-ceph-rbd-and-qos/ We introduced this mostly to avoid a user exhausting the IOPS we have available on the Ceph cluster. For the local root disks, we do not limit the IO. We have configured different volume types (standard and high IOPS), and the feature works really well for us. HTH, Arne > On 15 Feb 2017, at 06:10, Xu, Rongjie (Nokia - CN/Hangzhou) <rongjie.xu at nokia.com> wrote: > > Hi > > I want to limit VM IOPS. Currently I am using “quota:disk_total_iops_sec” in Flavor. My question is: > > Does it set the IOPS limitation just for root disk? What if I have a cinder volume attached to the VM? > > Thanks. > > Best Regards > Xu Rongjie (Max) > > > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack at lists.openstack.org > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack — Arne Wiebalck CERN IT