Some documents from My Oracle Support that may be of relevance to this configuration:
The parameter file can be located in one of the three (3) following (in search order):
$ORACLE_HOME/dbs/oranfstab which is used to separate NFS mounts by database home./etc/oranfstab which is for all databases (including ASM)./etc/mtab which was not investigated by me.A sample format of the parameter file is:
server: freenas <= Name for reference in V$DNFS_* views path: 192.168.2.1 <= NIC on NFS server local: 192.168.2.2 <= NIC on database server export: /mnt/PENRITH/ASMDATA <= mount point on NFS server mount: /u07 <= mount point on database server
The following command installs the DirectNFS driver:
ln -s libnfsodm11.so libodm11.so
The following parameter should be put into either the pfile or spfile:
filesystemio_options = directio
To make the DirectNFS driver effective, all of the above has to be done before restarting the ASM and Database instances.
There are two (2) places:
V$DNFS_SERVERS view should match the contents of the oranfstab file.See 14 Set Up DirectNFS for Example Database for a successful implementation of DirectNFS.