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

[Sinan Polat <sinan@xxxxxxxx>]

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

Op 22 mrt. 2018 om 07:59 heeft Wido den Hollander <wido@xxxxxxxx> het volgende geschreven:

On 03/21/2018 06:48 PM, Andre Goree wrote:

I'm trying to determine the best way to go about configuring IO

rate-limiting for individual images within an RBD pool.

Here [1], I've found that OpenStack appears to use Libvirt's "iotune"

parameter, however I seem to recall reading about being able to do so

via Ceph's settings.

Is there a place in Ceph to set IO limits on individual images within an

RBD pool?  Thanks in advance for the advice.

No, there is not. Right now you will need to limit this through
libvirt/Qemu indeed.

People are thinking about a QoS mechanism inside the OSDs, but that's
not there yet, so don't count on it.

Wido

[1] https://ceph.com/geen-categorie/openstack-ceph-rbd-and-qos/

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