I have some quite large volumes (~40-120GB uncompressed) that I'd like to render and would appreciate any pointers to the current state of the art?

Before I go to the work of getting the data into OpenVDB format, I'm trying to find out if mantra (or any other production renderer) utilise out of core delayed loading of subsets of an OpenVDB volume? I note that the openvdb::File class supports delayed loading of volume chunks, but I don't know if this functionality is enabled and accessible from houdini/mantra.

Thanks.