Setup DBFS on RAC 11.2.0.4.3, UEK3.13 using fuse-2.8.3

Install and Configure Fuse package and mount points

[root@grac41 Desktop]# yum install fuse fuse-libs kernel-devel
Setting up Install Process
Package fuse-2.8.3-4.0.2.el6.x86_64 already installed and latest version
Package fuse-libs-2.8.3-4.0.2.el6.x86_64 already installed and latest version
Package kernel-devel-2.6.32-431.20.3.el6.x86_64 already installed and latest version
Nothing to do
--> Fuse kits already installed

Configure Fuse for a 3 node RAC cluster 
On grac41:
# echo user_allow_other > /etc/fuse.conf
# chmod 644 /etc/fuse.conf
# cat /etc/fuse.conf 
user_allow_other
# ls -l /etc/fuse.conf
root@grac41 Desktop]# scp /etc/fuse.conf grac42:/etc/fuse.conf
fuse.conf                                                                                         100%   17     0.0KB/s   00:00    
[root@grac41 Desktop]#  scp /etc/fuse.conf grac43:/etc/fuse.conf
fuse.conf                                                                                         100%   17     0.0KB/s   00:00    
[root@grac41 Desktop]# ssh grac42 ls -l /etc/fuse.conf
-rw-r--r--. 1 root root 17 Jul 24 09:44 /etc/fuse.conf
[root@grac41 Desktop]#  ssh grac43 ls -l /etc/fuse.conf
-rw-r--r--. 1 root root 17 Jul 24 09:45 /etc/fuse.conf

On grac41, grac42 and grac43 
# mkdir -p /u01/oradata/dbfs_direct
# chown oracle:dba /u01/oradata/dbfs_direct
# ls -ld  /u01/oradata/dbfs_direct
drwxr-xr-x. 2 oracle dba 4096 Jul 24 09:49 /u01/oradata/dbfs_direct

Create DBFS Filesystem

SQL> connect dbfs_user/dbfs_user
SQL> @?/rdbms/admin/dbfs_create_filesystem dbfs_ts FS1
No errors.
--------
CREATE STORE:
begin dbms_dbfs_sfs.createFilesystem(store_name => 'FS_FS1', tbl_name =>
'T_FS1', tbl_tbs => 'dbfs_ts', lob_tbs => 'dbfs_ts', do_partition => false,
partition_key => 1, do_compress => false, compression => '', do_dedup => false,
do_encrypt => false); end;
--------
REGISTER STORE:
begin dbms_dbfs_content.registerStore(store_name=> 'FS_FS1', provider_name =>
'sample1', provider_package => 'dbms_dbfs_sfs'); end;
--------
MOUNT STORE:
begin dbms_dbfs_content.mountStore(store_name=>'FS_FS1', store_mount=>'FS1');
end;
--------
CHMOD STORE:
declare m integer; begin m := dbms_fuse.fs_chmod('/FS1', 16895); end;
No errors.

Set the NOCACHE storage option to the LOB segment used by DBFS
SQL> ALTER TABLE DBFS_USER.T_FS1 MODIFY LOB (FILEDATA) (NOCACHE LOGGING);
SQL> SELECT owner , table_name , segment_name , logging , cache FROM dba_lobs WHERE tablespace_name='DBFS_TS';

OWNER                          TABLE_NAME                     SEGMENT_NAME                   LOGGING CACHE
------------------------------ ------------------------------ ------------------------------ ------- ----------
DBFS_USER                      T_FS1                          LOB_SFS$_FST_1                 YES     NO

Configure “fuse” library links on all  nodes (connected as “root” OS user):

On grac41,grac42,grac43
[root@grac41 Desktop]# . /u01/app/oracle/product/11204/racdb/bin/oraenv
ORACLE_SID = [root] ? grac41
The Oracle base has been set to /u01/app/oracle
[root@grac41 Desktop]# sqlplus scott/tiger
--> should work !

Configure shared libraries

# echo "/usr/local/lib" >> /etc/ld.so.conf.d/usr_local_lib.conf
# cd /usr/local/lib
# ln -s $ORACLE_HOME/lib/libclntsh.so.11.1
# ln -s $ORACLE_HOME/lib/libnnz11.so
# locate libfuse.so
/lib64/libfuse.so.2
/lib64/libfuse.so.2.8.3
/usr/local/lib/libfuse.so
# ln -s /lib64/libfuse.so.2 libfuse.so
# ldconfig
# ldconfig -p | grep fuse
    libfuse.so.2 (libc6,x86-64) => /lib64/libfuse.so.2
    libfuse.so (libc6,x86-64) => /usr/local/lib/libfuse.so
# ln -s $ORACLE_HOME/bin/dbfs_client /sbin/mount.dbfs

--> Run above commands on all nodes

Download, edit and test mount-dbfs.sh script

The “mount-dbfs.sh” script is also attached in this associated MOS Document (ID: 1591515.1).

Configure mount-dbfs.sh
[oracle@grac41 DBFS]$ cat  mount-dbfs.sh | egrep 'DBNAME|MOUNT_POINT|DBFS_USER|ORACLE_HOME|DBFS_PASS' | more
DBNAME=grac4
MOUNT_POINT= /u01/oradata/dbfs_direct
DBFS_USER=dbfs_user
ORACLE_HOME=/u01/app/oracle/product/11204/racdb
DBFS_PASSWD=dbfs_user

Copy new mount-dbfs.sh script at the “<Grid Infrastructure _HOME>/crs/script/”
# scp mount-dbfs.sh grac41:/u01/app/11204/grid/crs/script
# scp mount-dbfs.sh grac42:/u01/app/11204/grid/crs/script
# scp mount-dbfs.sh grac43:/u01/app/11204/grid/crs/script

On all nodes change and verify protections:
# cd /u01/app/11204/grid/crs/script
# pwd
/u01/app/11204/grid/crs/script
# chown oracle:dba  mount-dbfs.sh 
# chmod 750 mount-dbfs.sh 
# ls -l mount-dbfs.sh 
-rwxr-x---. 1 oracle dba 11596 Jul 24 11:44 

Mount DBFS Filesystem a first time 
manually run  script /u01/app/11204/grid/crs/script/mount-dbfs.sh  (as oracle OS user or the RDBMS Oracle Home owner) 
on all the nodes to mount the DBFS filesystem for the fist time as user oracle

$  mount-dbfs.sh start  

Potential errors during mount 
 - ./mount-dbfs.sh: line 198: /tmp/.dbfs-passwd.txt.31706: No such file or directory     ( crit
 - ./mount-dbfs.sh status reports DBFS as OFFLINE but OS mount if DBFS filesystemis ok ! ( critical )
var/log/messages 
   fuse: failed to exec fusermount: Permission denied
   A dynamic linking error occurred: (libfuse.so: cannot open shared object file: No such file or directory)

To debug and fix these error please read following article. 

Note before deploying mount-dbfs.sh script test script on all nodes by using following sequence
      $  mount-dbfs.sh status 
      $  mount-dbfs.sh start 
      $  mount-dbfs.sh status   ( you repeat this command as DBFS start may take some time )
      $  mount-dbfs.sh stop
      $  mount-dbfs.sh status

Deploy mount-dbfs.sh as a CW resource and verify resource status

[oracle@grac41 DBFS]$ cat  add-dbfs-resource.sh 
#!/bin/bash 
#
# Script name : add-dbfs-resource.sh 
# $GRID_HOME is set 
# 
ACTION_SCRIPT=$GRID_HOME/crs/script/mount-dbfs.sh 
ls -l $ACTION_SCRIPT
RESNAME=dbfs_mount 
DBNAME=grac4
DBNAMEL=`echo $DBNAME | tr A-Z a-z` 
echo DBNAME: $DBNAMEL
ORACLE_HOME=$GRID_HOME
PATH=$ORACLE_HOME/bin:$PATH 
export PATH ORACLE_HOME 
crsctl add resource $RESNAME  -type local_resource  -attr "ACTION_SCRIPT=$ACTION_SCRIPT, 
 CHECK_INTERVAL=30,RESTART_ATTEMPTS=10, START_DEPENDENCIES='hard(ora.$DBNAMEL.db)pullup(ora.$DBNAMEL.db)',
  STOP_DEPENDENCIES='hard(ora.$DBNAMEL.db)',  SCRIPT_TIMEOUT=30

[grid@grac41 DBFS]$ crsctl status resource dbfs_mount
NAME=dbfs_mount
TYPE=local_resource
TARGET=OFFLINE, OFFLINE, OFFLINE
STATE=OFFLINE, OFFLINE, OFFLINE

[grid@grac41 DBFS]$ crsctl start resource dbfs_mount
CRS-2672: Attempting to start 'dbfs_mount' on 'grac41'
CRS-2672: Attempting to start 'dbfs_mount' on 'grac42'
CRS-2672: Attempting to start 'dbfs_mount' on 'grac43'
CRS-2676: Start of 'dbfs_mount' on 'grac41' succeeded
CRS-2676: Start of 'dbfs_mount' on 'grac43' succeeded
CRS-2676: Start of 'dbfs_mount' on 'grac42' succeeded

grid@grac41 DBFS]$ crsctl status resource dbfs_mount
NAME=dbfs_mount
TYPE=local_resource
TARGET=ONLINE          , ONLINE          , ONLINE
STATE=ONLINE on grac41, ONLINE on grac42, ONLINE on grac43

Test DBFS filesystem with  different users from different cluster nodes
[grid@grac41 DBFS]$ touch  /u01/oradata/dbfs_direct/FS1/INFO_from_grid__at_grac41
[root@grac43 ~]# touch  /u01/oradata/dbfs_direct/FS1/INFO_from_root_at_grac43
[oracle@grac42 script]$ touch  /u01/oradata/dbfs_direct/FS1/INFO_from_oracle_at_grac42
[oracle@grac42 script]$ ls -l  /u01/oradata/dbfs_direct/FS1/INFO*
-rw-r--r--. 1 oracle oinstall 0 Jul 25 11:56 /u01/oradata/dbfs_direct/FS1/INFO_from_oracle_at_grac42
-rw-r--r--. 1 root   root     0 Jul 25 11:54 /u01/oradata/dbfs_direct/FS1/INFO_from_root_at_grac43
-rw-r--r--. 1 grid   oinstall 0 Jul 25 11:58 /u01/oradata/dbfs_direct/FS1/INFO_from_grid__at_grac41

Reference

  • DBFS (White Paper/Demo): How To Setup & Configure 11.2.0.X DBFS Filesystems On RAC Cluster Configurations (CRS Managed) On Linux. (Doc ID 1591515.1)
  • Configuring DBFS on Oracle Database Machine [ID 1054431.1]
  • Dbfs File System became unmounted due to mount-dbfs.sh timeout on Exadata Database Machine (Doc ID 1385927.1)
  • NOTE:1320683.1 – How to trace DBFS when any failure happens
  • How to clean-up failed DBFS configuration (Doc ID 1312236.1)
  • Accessing Dbfs Using Oracle Wallet Fails With Input/output error (Doc ID 1358194.1)
  • Cluster Resource DBFS in not starting (Doc ID 1401303.1)
  • Dbfs File System became unmounted due to mount-dbfs.sh timeout on Exadata Database Machine(Doc ID 1385927.1)
  • Errors when mounting a DBFS store using fstab due to missing libraries (Doc ID 1053008.1)
  • http://www.oracle-base.com/articles/11g/dbfs-11gr2.php
  • Debugging problems when mounting a  DBFS filesystem

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