>I noticed QOS in general is not working.
> Btw, I am using latest icehouse devstack and testing this on a mapped rbd 
> device. Please, advise.

There lies the problem, throttling is not working for ceph devices in Icehouse. 
( images_type=rbd )
This is fixed in Juno but was never back-ported.
The bug report is here: https://bugs.launchpad.net/nova/+bug/1362129

Cheers,
Robert van Leeuwen
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