[Users] Create ISO domain from scratch? Not attached, create!

Ok, this one has me scratching my head... Have existing oVirt 3.1 environment, based on Fedora 17, storage resource is NFS, also based on Fedora 17. Can create NFS storage domain, no problem. But when the environment was setup initially, no (local) ISO domain as created. Now, under oVirt engine 3.1, the option to create a storage type under domain function, only allows for creation of data type domain, only type in the drop down list is DATA/NFS? What gives? It used to be 3.0 and older, you could select the storage type as Data or ISO! Anyone have this issue as well? Any help appreciated.