I had this question after viewing Storage vMotion
I am currently migrating a powered on VM (ESXi 5.5U3). From my understanding, I cannot cancel a Storage vMotion when the server is running. I have to wait for it to complete instead.
Is this accurate? It's also a 4TB mail server but across a 1Gbps private line. It's been running for 24 hrs, and only at 64% complete.