https://blueprints.launchpad.net/nova/+spec/volume-rate-limiting
I don't see any patches for this blueprint yet. There's still a week until the freeze, though, so it might get in.
This now has a patch, https://review.openstack.org/#/c/42521/ , under review.
This got merged into Havana.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHEA-2013-1859.html
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days