Oracle11gR2中已经集成了direct nfs driver，而在此之前是没有改驱动的
也就是说在11gR2中，经过简单设置之后，就能直接利用其他NAS存储设备了。
和传统的nfs比,好处是提高了性能和配置的简便性.
下面简要描述一下direct nfs 的配置过程。
环境如下：两台linux5.5
其中：一台安装oracle11gR2，也是nfs client （IP：192.168.133.11,NAME:edbj2p1）；
一台nfs server （IP：192.168.133.12,NAME:edbj2p2） ；
服务器端共享的目录: /vol/oradata
客户端挂载点:/u02/oradata/prod1
创建的表空间:shared_data
1.配置服务端edbj2p2
[root@edbj2p2 ~]# echo '/vol/oradata 192.168.133.11(rw,no_root_squash,insecure)' >> /etc/exports
注意:这里一定要加 insecure,否则,无法正常使用dnfs
[root@edbj2p2 ~]# exportfs -arv
[root@edbj2p2 ~]# service nfs restart
--确定服务端的nfs共享
[root@edbj2p2 ~]# showmount -e edbj2p2
Export list for edbj2p2:
/vol/oradata 192.168.133.11
2.配置客户端edbj2p1
2.1 确定portmap服务运行
[root@edbj2p2 ~]# service portmap status
portmap (pid 3540) is running...
2.2先确认在客户端机器可以看到服务器端共享出来的nfs
[root@edbj2p1 ~]# showmount -e edbj2p2
Export list for edbj2p2:
/vol/oradata 192.168.133.11
2.3调整libodm11.so文件
[oracle@edbj2p1 ~]$ cd $ORACLE_HOME/lib
[oracle@edbj2p1 lib]$ pwd
/u01/app/oracle/product/11.2.0/dbhome_1/lib
--修改libodm11.so,使用libnfsodm11.so
[oracle@edbj2p1 lib]$ mv libodm11.so libodm11.so.bak
[oracle@edbj2p1 lib]$ ln -s libnfsodm11.so libodm11.so
或者 一条命令搞定:
make -f ins_rdbms.mk dnfs_on
确认一下
[oracle@edbj2p1 lib]$ ls -ltr libodm*
-rw-r--r-- 1 oracle oinstall 5266 Sep 18 2011 libodm11.a
-rw-r--r-- 1 oracle oinstall 8957 Sep 18 2011 libodmd11.so
lrwxrwxrwx 1 oracle oinstall 12 Feb 5 16:05 libodm11.so.bak -> libodmd11.so
lrwxrwxrwx 1 oracle oinstall 14 Feb 6 11:39 libodm11.so -> libnfsodm11.so
2.4 创建oranfstab文件
--进入$ORACLE_HOME/dbs目录
[oracle@edbj2p1 lib]$ cd $ORACLE_HOME/dbs
[oracle@edbj2p1 dbs]$ pwd
/u01/app/oracle/product/11.2.0/dbhome_1/dbs
--创建 oranfstab
[oracle@edbj2p1 dbs]$ touch oranfstab
[oracle@edbj2p1 dbs]$ echo 'server:edbj2p2' >> oranfstab
[oracle@edbj2p1 dbs]$ echo 'path:192.168.133.12' >> oranfstab
[oracle@edbj2p1 dbs]$ echo 'export: /vol/oradata mount: /u02/oradata/prod1' >> oranfstab
其中：server:edbj2p2 代表nfs server的hostname
path:192.168.133.12 代表nfs server的IP
export: /vol/oradata 代表服务器端的目录
mount: /u02/oradata/prod1 代表nfs client上的目录
--在客户端事先建好目录
[root@edbj2p1 ~]# mkdir -p /u02/oradata/prod1
[root@edbj2p1 ~]# chown -R oracle:oinstall /u02/oradata/prod1
[root@edbj2p1 ~]# chmod -R 775 /u02/oradata/prod1
3.加载nfs (在客户端操作)
3.1 直接加载nfs
mount -t nfs edbj2p2:/vol/oradata /u02/oradata/prod1
3.2 永久生效,需要修改/etc/fstab
192.168.133.12:/vol/oradata /u02/oradata/prod1 nfs defaults 0 0
3.3 检查挂载结果
[root@edbj2p1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
...
192.168.133.12:/vol/oradata
16G 2.8G 12G 20% /u02/oradata/prod1
4.dnfs生效 (在客户端操作)
只有重起数据库,才能生效
sqlplus /nolog
sql>startup force
检查数据库日志,有以下记录:
...
diagnostic_dest = "/u01/app/oracle/product/11.2.0/dbhome_1"
Oracle instance running with ODM: Oracle Direct NFS ODM Library Version 3.0
Mon Feb 06 14:35:54 2017
...
Direct NFS: attempting to mount /vol/oradata on filer edbj2p2 defined in oranfstab
Direct NFS: channel config is:
channel id [0] local path [192.168.133.12]
Direct NFS: mount complete dir /vol/oradata on edbj2p2 mntport 854 nfsport 2049
Direct NFS: channel id [0] path [192.168.133.12] to filer [edbj2p2] via local is UP
Direct NFS: channel id [1] path [192.168.133.12] to filer [edbj2p2] via local is UP
5.在dnfs上建立表空间 (在客户端操作)
create tablespace SHARED_DATA datafile '/u02/oradata/prod1/shared_data01.dbf' size 10m;
题外话：
create tablespace SHARED_DATA datafile '/u02/oradata/prod1/shared_data01.dbf' size 10m
Direct NFS: please check that oradism is setuid
如果后端报这个错,需要设置setuid
chown root oradism
chmod u+s oradism
6.验证:
6.1 v$dnfs_servers中,svrname应该是oranfstab中的server后面的项目
col dirname for a13
col SVRNAME for a10
select * from v$dnfs_servers;
1* select * from v$dnfs_servers
ID SVRNAME DIRNAME MNTPORT NFSPORT WTMAX RTMAX
1 edbj2p2 /vol/oradata 854 2049 32768 32768
6.2 数据文件使用情况
col filename for a40
select * from V$DNFS_FILES
FILENAME FILESIZE PNUM SVR_ID
/u02/oradata/prod1/shared_data01.dbf 10493952 10 1
6.3 dnfs通道情况
col path for a20
col local for a10
set line 200
select * from V$DNFS_CHANNELS
PNUM SVRNAME PATH LOCAL CH_ID SVR_ID SENDS RECVS PINGS
10 edbj2p2 192.168.133.12 0 1 0 0 0
10 edbj2p2 192.168.133.12 1 1 0 0 0
11 edbj2p2 192.168.133.12 0 1 0 0 0
11 edbj2p2 192.168.133.12 1 1 0 0 0
30 edbj2p2 192.168.133.12 0 1 0 0 0
6.4 服务器端端口连接情况:
[root@edbj2p2 oradata]# netstat -an |grep 2049
tcp 0 0 0.0.0.0:2049 0.0.0.0:* LISTEN
tcp 0 0 192.168.133.12:2049 192.168.133.11:20295 ESTABLISHED
tcp 0 0 192.168.133.12:2049 192.168.133.11:51581 ESTABLISHED
tcp 0 0 192.168.133.12:2049 192.168.133.11:690 ESTABLISHED
tcp 0 0 192.168.133.12:2049 192.168.133.11:36340 ESTABLISHED
tcp 0 0 192.168.133.12:2049 192.168.133.11:15344 ESTABLISHED
udp 0 0 0.0.0.0:2049 0.0.0.0:*