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The question hear is whether this discard option is supported by your cinder volume driver. I would say that if this is a new feature in Nova, then its not going to be supported within Cinder yet. As you can see from the support matrix they do not even list a trim/ discard option.

https://wiki.openstack.org/wiki/CinderSupportMatrix

Doing a cursory look through the cinder api and the lvm driver, there are no functions for doing a discard.