Home > Storage > Unity XT > Virtualization, Cloud & Applications > Dell Unity XT: Oracle Database Best Practices > dNFS without oranfstab
If oranfstab does not exist, dNFS creates a single dNFS channel for entries found in /etc/mtab that are required for the running database. This single dNFS channel is used for both dNFS control and dNFS data traffic. The local IP address used for the dNFS channel is the IP address used to mount the NFS share. In Oracle, the dNFS channel has a name equal to the local IP address of the mount entry in /etc/mtab.
Note: If oranfstab is not used, dNFS load balancing and scaling are not available. For more information, see Benefits of using oranfstab.
Figure 59 shows the mount point, /etc/fstab, and /etc/mtab entries for the single NFS share used in this paper:
Figure 60 shows Oracle referring to the name (filer) of the single channel as the IP address used to mount the Unity NFS export. Because a local:path IP address mapping is not defined in file oranfstab for the mount IP, dNFS reports the local IP in the alert log as a null value. In this case, dNFS uses the IP address used to mount the NFS share for dNFS data traffic.
If multiple channels to a NAS server are needed for increased dNFS bandwidth, automatic dNFS data traffic load balancing, or automatic dNFS channel failover, the file oranfstab is required. dNFS automatically performs load balancing across all specified channels defined in oranfstab. If one channel fails, dNFS reissues I/O commands over any remaining available channel for that NAS server.