Hi everyone. We registered two individual blue print. One is simple, swap-volume feature should be provide cancelling functionality. Another is a bit complicated, OpenStack API should be support API idempotency. - Cancelling a swap volume https://blueprints.launchpad.net/nova/+spec/cancel-swap-volume - Idempotency for OpenStack API https://blueprints.launchpad.net/nova/+spec/idempotentcy-client-token Please check and review these. Best Regards, /** Takahiro Shida Cheif Consultant NTTDATA INTELLILINK Phone: +81 3 5843 6880 Mail: shida at intellilink.co.jp */