Storage : DC, Storage and cluster relationship question

Hi

I'm struggling a bit with the conecpt and relationship between datacentre, storage domain and cluster.

Is it possible to have a single datacentre with two clusters that are visible to two seperate fibre channel based data storage domains? For instance hosts in cluster A can only see shared lun A and hosts in cluster B can only see shared lun B.   Or would I have to create two seperate datacentres ?