{"id":11936,"date":"2019-05-01T18:16:03","date_gmt":"2019-05-01T18:16:03","guid":{"rendered":"https:\/\/dbtut.com\/?p=11936"},"modified":"2021-02-05T23:03:19","modified_gmt":"2021-02-05T23:03:19","slug":"oracle-direct-nfs-dnfs","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2019\/05\/01\/oracle-direct-nfs-dnfs\/","title":{"rendered":"Oracle Direct NFS (dNFS)"},"content":{"rendered":"<p>Oracle Direct NFS (dNFS) is an optimized NFS client that provides faster and more scalable access to NFS storage in NAS storage devices.<\/p>\n<p>Direct NFS is provided as part of the database kernel, so it can be used on all supported database platforms. It bypasses the NFS driver of the operating system and provides faster performance than the NFS driver of the operating system because it meets all the requests itself it needs.<\/p>\n<h2>Enable Direct NFS<\/h2>\n<p>You can enable dNFS with the following commands.<\/p>\n<pre class=\"lang:default decode:true \">cd $ORACLE_HOME\/lib\r\nmv libodm11.so libodm11.so_stub\r\nln -s libnfsodm11.so libodm11.so<\/pre>\n<p>With 11g R2, you can also enable as follows.<\/p>\n<pre class=\"lang:default decode:true \">cd $ORACLE_HOME\/rdbms\/lib\r\nmake -f ins_rdbms.mk dnfs_on<\/pre>\n<h2>Disable Direct NFS<\/h2>\n<p>You can disable dNFS with the following commands.<\/p>\n<pre class=\"lang:default decode:true \">cd $ORACLE_HOME\/rdbms\/lib\r\nmake -f ins_rdbms.mk dnfs_off<\/pre>\n<p>Direct NFS uses a configuration file named oranfstab to determine which mount directories are available. This file can be in the\/etc or $ORACLE_HOME\/dbs directories. If this file is not present, it looks for mount directories in the \/etc\/mtab file.<\/p>\n<p><strong>oranstab:<\/strong><\/p>\n<pre class=\"lang:default decode:true \">server: NFSserver\r\nlocal: 192.168.10.10 path: 192.168.10.163\r\nlocal: 192.168.10.10 path: 192.168.10.164\r\nexport: \/export\/ORCL mount: \/zfssa\/ORCL<\/pre>\n<p>server-&gt; an optional name (usually the name of the nfs server)<br \/>\nlocal-&gt; The interface ip where the client reaches the nfs server<br \/>\npath-&gt; The interface ip of the nfs server<br \/>\nexport-&gt; share path on nfs server<br \/>\nmount -&gt; client&#8217;s local path<\/p>\n<p>If the path is more than one as above, it will load balancing. If there are more than one interfaces that the NFS server provides , then this is the case . Up to 4 paths can be entered.<\/p>\n<p>After your directory has been mounted, your database must be rebooted to use Direct NFS if your database has a pre-12c version. 12c databases use dNFS by default. When you see the following lines in the alert log file when you restart, it means the database is using dNFS.<\/p>\n<pre class=\"lang:default decode:true \">Oracle instance running with ODM: Oracle Direct NFS ODM Library Version 4.0<\/pre>\n<p>You can use the following query to see the active usage.<\/p>\n<pre class=\"lang:default decode:true \">SQL&gt; column ID format 99\r\nSQL&gt; column SVRNAME format a15\r\nSQL&gt; column DIRNAME format a15\r\nSQL&gt; select * from v$dnfs_servers;\r\n\r\n ID SVRNAME\t    DIRNAME\t       MNTPORT\t  NFSPORT      WTMAX\t  RTMAX\r\n--- --------------- --------------- ---------- ---------- ---------- ----------\r\n  1 192.168.10.155  \/export\/ORCL\t 35047\t     2049    1048576\t1048576<\/pre>\n<p>The views that can be used for Direct NFS are as follows.<\/p>\n<table class=\"complex\" border=\"1\" summary=\"v$tables for Direct NFS information\">\n<tbody valign=\"top\">\n<tr style=\"height: 23px;\">\n<td style=\"height: 23px;\">v$dnfs_servers<\/td>\n<td style=\"height: 23px;\">Displays the servers that access using Direct NFS.<\/td>\n<\/tr>\n<tr style=\"height: 47px;\">\n<td style=\"height: 47px;\">v$dnfs_channels<\/td>\n<td style=\"height: 47px;\">Displays information about Oracle process connections that are opened to NFS servers.<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"height: 23px;\">v$dnfs_files<\/td>\n<td style=\"height: 23px;\">Displays files that are currently in use with Direct NFS.<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"height: 23px;\">v$dnfs_stats<\/td>\n<td style=\"height: 23px;\">Displays information with direct NFS performance statistics.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>To mount the corresponding nfs share, create a directory to mount and add a line in the \/ etc \/ fstab file. And mount it with the mount command.<\/p>\n<pre class=\"lang:default decode:true \">192.168.10.163:\/export\/ORCL \/zfssa\/ORCL nfs rw,bg,hard,nointr,rsize=1048576,wsize=1048576,tcp,nfsvers=3,timeo=600,addr=192.168.10.163 0 0<\/pre>\n<pre class=\"lang:default decode:true \">mkdir \/zfssa\/ORCL\r\nmount \/zfssa\/ORCL<\/pre>\n<p>Mount options vary according to operating systems. You can find out what options should be used on your operating system in the following table. It is recommended to use 1048576 for rsize and wsize values in the table.<\/p>\n<table border=\"1\">\n<tbody>\n<tr style=\"height: 46px;\">\n<td style=\"height: 46px; width: 33.2005%;\"><strong>Operating System<\/strong><\/td>\n<td style=\"height: 46px; width: 66.0027%;\"><strong>Mount options for Binaries<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 33.2005%;\">Sun Solaris *<\/td>\n<td style=\"height: 70px; width: 66.0027%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,proto=tcp,noac,vers=3,suid<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 33.2005%;\">AIX (5L) **<\/td>\n<td style=\"height: 70px; width: 66.0027%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,proto=tcp,vers=3,timeo=600<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 33.2005%;\">HPUX 11.23 ***\u00a0 \u2014<\/td>\n<td style=\"height: 70px; width: 66.0027%;\">rw,bg,vers=3,proto=tcp,noac,<br \/>\nhard,nointr,timeo=600,<br \/>\nrsize=32768,wsize=32768,suid<\/td>\n<\/tr>\n<tr style=\"height: 141px;\">\n<td style=\"height: 141px; width: 33.2005%;\">Windows<br \/>\n(Use dNFS if needed.<br \/>\nRefer to<br \/>\n<a href=\"https:\/\/support.oracle.com\/epmos\/faces\/DocumentDisplay?parent=DOCUMENT&amp;sourceId=359515.1&amp;id=1468114.1\">Document 1468114.1<\/a><\/td>\n<td style=\"height: 141px; width: 66.0027%;\">Not Supported<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 33.2005%;\">Linux x86<br \/>\n#<br \/>\n****<\/td>\n<td style=\"height: 70px; width: 66.0027%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp, vers=3,<br \/>\ntimeo=600, actimeo=0<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 33.2005%;\">Linux x86-64 #<br \/>\n****<\/td>\n<td style=\"height: 70px; width: 66.0027%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp,vers=3,<br \/>\ntimeo=600, actimeo=0<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 33.2005%;\">Linux \u2013 Itanium<\/td>\n<td style=\"height: 70px; width: 66.0027%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp,vers=3,<br \/>\ntimeo=600, actimeo=0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table border=\"1\">\n<tbody>\n<tr style=\"height: 46px;\">\n<td style=\"height: 46px; width: 34.6614%;\"><strong>Operating System<\/strong><\/td>\n<td style=\"height: 46px; width: 64.5418%;\"><strong>Mount options for Oracle Datafiles<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 34.6614%;\">Sun Solaris *<\/td>\n<td style=\"height: 70px; width: 64.5418%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,proto=tcp,noac,<br \/>\nforcedirectio, vers=3<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 34.6614%;\">AIX (5L) **<\/td>\n<td style=\"height: 70px; width: 64.5418%;\">cio,rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,proto=tcp,noac,<br \/>\nvers=3,timeo=600<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 34.6614%;\">HPUX 11.23 ***\u00a0 \u2014<\/td>\n<td style=\"height: 70px; width: 64.5418%;\">rw,bg,vers=3,proto=tcp,noac,<br \/>\nforcedirectio,hard,nointr,timeo=600,<br \/>\nrsize=32768,wsize=32768<\/td>\n<\/tr>\n<tr style=\"height: 141px;\">\n<td style=\"height: 141px; width: 34.6614%;\">Windows<br \/>\n(Use dNFS if needed.<br \/>\nRefer to<br \/>\n<a href=\"https:\/\/support.oracle.com\/epmos\/faces\/DocumentDisplay?parent=DOCUMENT&amp;sourceId=359515.1&amp;id=1468114.1\">Document 1468114.1<\/a><\/td>\n<td style=\"height: 141px; width: 64.5418%;\">Not Supported<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 34.6614%;\">Linux x86<br \/>\n#<br \/>\n****<\/td>\n<td style=\"height: 70px; width: 64.5418%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp,actimeo=0,<br \/>\nvers=3,timeo=600<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 34.6614%;\">Linux x86-64 #<br \/>\n****<\/td>\n<td style=\"height: 70px; width: 64.5418%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp,actimeo=0,<br \/>\nvers=3,timeo=600<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 34.6614%;\">Linux \u2013 Itanium<\/td>\n<td style=\"height: 70px; width: 64.5418%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp,actimeo=0,<br \/>\nvers=3,timeo=600<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table border=\"1\">\n<tbody>\n<tr style=\"height: 46px;\">\n<td style=\"height: 46px; width: 23.6402%;\"><strong>Operating System<\/strong><\/td>\n<td style=\"height: 46px; width: 75.7322%;\"><strong>Mount options for CRS Voting Disk and OCR (12.1 and lower)<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 23.6402%;\">Sun Solaris *<\/td>\n<td style=\"height: 70px; width: 75.7322%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,proto=tcp,vers=3,<br \/>\nnoac,forcedirectio<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 23.6402%;\">AIX (5L) **<\/td>\n<td style=\"height: 70px; width: 75.7322%;\">cio,rw,bg,hard,intr,rsize=32768,<br \/>\nwsize=32768,tcp,noac,<br \/>\nvers=3,timeo=600<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 23.6402%;\">HPUX 11.23 ***\u00a0 \u2014<\/td>\n<td style=\"height: 70px; width: 75.7322%;\">rw,bg,vers=3,proto=tcp,noac,<br \/>\nforcedirectio,hard,nointr,timeo=600<br \/>\n,rsize=32768,wsize=32768<\/td>\n<\/tr>\n<tr style=\"height: 141px;\">\n<td style=\"height: 141px; width: 23.6402%;\">Windows<br \/>\n(Use dNFS if needed.<br \/>\nRefer to<br \/>\n<a href=\"https:\/\/support.oracle.com\/epmos\/faces\/DocumentDisplay?parent=DOCUMENT&amp;sourceId=359515.1&amp;id=1468114.1\">Document 1468114.1<\/a><\/td>\n<td style=\"height: 141px; width: 75.7322%;\">Not Supported<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 23.6402%;\">Linux x86<br \/>\n#<br \/>\n****<\/td>\n<td style=\"height: 70px; width: 75.7322%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp,noac,actimeo=0,<br \/>\nvers=3,timeo=600<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 23.6402%;\">Linux x86-64 #<br \/>\n****<\/td>\n<td style=\"height: 70px; width: 75.7322%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp,noac,vers=3,<br \/>\ntimeo=600,actimeo=0<\/td>\n<\/tr>\n<tr style=\"height: 70px;\">\n<td style=\"height: 70px; width: 23.6402%;\">Linux \u2013 Itanium<\/td>\n<td style=\"height: 70px; width: 75.7322%;\">rw,bg,hard,nointr,rsize=32768,<br \/>\nwsize=32768,tcp,noac,vers=3,<br \/>\ntimeo=600,actimeo=0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_11936\" class=\"pvc_stats all  \" data-element-id=\"11936\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Oracle Direct NFS (dNFS) is an optimized NFS client that provides faster and more scalable access to NFS storage in NAS storage devices. Direct NFS is provided as part of the database kernel, so it can be used on all supported database platforms. 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