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Oracle Direct NFS (dNFS) is an optimized NFS client from Oracle for database I/O and resides in the ODM library as a part of the Oracle database kernel. dNFS improves the stability and reliability of NFS storage devices over TCP/IP, more so than the native Linux NFS driver (kNFS). dNFS also improves performance to NFS storage devices by bypassing the kNFS I/O stack. When mounting an NFS database datafile, Oracle first loads dNFS functionality if the Direct NFS client ODM library is enabled. If dNFS cannot access an NFS storage device, dNFS silently reverts to using the kNFS client. However, to ensure that this reversion occurs, kNFS client mount options rsize and wsize must be used.