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Generally, NFS traffic can be classified as control/management traffic or I/O traffic on application data. Whether or not the Oracle ODM NFS client library is enabled, the Linux NFS kernel client (kNFS) driver manages the control/management of NFS devices. When the ODM library is enabled, the Oracle environment is said to be using Oracle Direct NFS (dNFS) and all database I/O, NFS data traffic, flows through the dNFS driver. When the ODM library containing the embedded Oracle NFS client is disabled, all database I/O flows through the kNFS client driver.
Some examples of NFS control and management activity involve the following operations on the NFS share: