Over at Glenn Fawcett’s Oracle Blog, there is a write-up about the speed of Oracle’s Direct NFS (now a few years old) as compared to the traditional NFS client. Glenn wrote about how to set this up initially, then followed up with a report on how to monitor the environment, as well as the results of testing the environment.
Glenn worked with Kevin Closson, who is one of the minds behind Oracle’s DirectNFS. Kevin wrote about the colloboration and about some of the misunderstandings surrounding dNFS with Solaris and Sun storage.
Oracle has a nice whitepaper on this topic, going into detail as well.
There is also an old posting by the Oracle Storage Guy describing DirectNFS in detail, particularly in regards to using dNFS with EMC storage.