No, it's not required.
You can integrate OCUM to trigger the SMO replication via SnapMirror and SnapVault from OCUM.
As many posts as you make here on the Community - I keep wishing you'd show up in one of my classes !
I hope this response has been helpful to you.
At your service,
Eugene E. Kashpureff, Sr.
Independent NetApp Consultant http://www.linkedin.com/in/eugenekashpureff
Senior NetApp Instructor, FastLane US http://www.fastlaneus.com/
(P.S. I appreciate 'kudos' on any helpful posts.)