
Here is a little more information on it from an openworld presentation.
Problem
Databases often replicated for test and development
Replicating databases is time-intensive
Requires lots of disk space, even when data stays static
Solution – dNFS CloneDB
Instantaneously replicate your production database for testing, development, reporting
Works for all NAS storage
Data replicated on cloned database only when necessary – when data is modified
Available in 11.2.0.2