Re: IO rate-limiting with Ceph RBD (and libvirt)

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On Fri, Mar 23, 2018 at 4:05 AM, Anthony D'Atri <aad@xxxxxxxxxxxxxx> wrote:
> FYI: I/O limiting in combination with OpenStack 10/12 + Ceph doesn?t work
> properly. Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1476830
>
>
> That's an OpenStack bug, nothing to do with Ceph.  Nothing stops you from
> using virsh to throttle directly:
>
> https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_tuning_and_optimization_guide/sect-virtualization_tuning_optimization_guide-blockio-techniques
>
> https://github.com/cernceph/ceph-scripts/blob/master/tools/virsh-throttle-rbd.py
>

Actually it's not even an OpenStack bug, it's a misunderstanding on
how volume limits work: the flavour will set the limits to the
instances when running from image, but the reporter is running from
volumes, so the limits have to be set with cinder volume types...

>
>
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