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Its called "replication" and most all storage can perform this function. Might cost some money to license it but it works well.
Clone is only a single point in time clone. I imagine you can use the CLI and schedule it to run every so often. You can only hot clone from a FC or iSCSI LUN. Not NFS. Even then, the target will have to be checked common file system errors. True replication software on the storage side will not have this issue. Bottom line, you shouldn't use Oracle VM to do "replication" of storage repositories.
OVM itself doesn't provide anything of this low-level volume manager-like functions. You will either have to replicate your LUNs using the storage solutions you already have, or come up with some other means of mirroring.
E.g. I am using two ASM nodes that provide a multipathed iSCSI target to the same ADVM volume, which is mounted on my OVM servers and then formatted using OCFS2. In the backend, the ADVM volume(s) are made up from three storage arrays (3 ASM faliure groups) per ASM disk group. This provides quite some redundancy to my storage repos.