OCFS2 Oracle Cluster File System version 2 is a file system which allows for multiple machines to open the same files at the same time without corruption. This file system can be used for multiple reasons but is mostly seen in Oracle RAC systems. This article details the configuration of OCFS2 after the RPMs have been installed on your OS.
1. Logon to your Linux server as root.
2. Create the directory /etc/ocfs2 to house your oracle cluster.conf file. This file will contain the name of your cluster and all nodes with in that cluster.
[root@mylinux1 etc]# mkdir /etc/ocfs2
[root@mylinux1 etc]# chmod 775 /etc/ocfs2
3. Edit the file cluster.conf and enter the strings similar to below; changing the value of ip_address, name and cluster to values which are correct for your installation..
[root@mylinux1 etc]# vi /etc/ocfs2/cluster.conf
node:
ip_port = 7777
ip_address = 204.34.132.38
number = 0
name = mylinux1.mydomain.com
cluster = myrac
node:
ip_port = 7777
ip_address = 204.34.132.39
number = 1
name = mylinux2.mydomain.com
cluster = myrac
cluster:
node_count = 2
name = myrac
4. Configure the ocfs2 installed on each node of the RAC with the o2cb configure command. NOTE: Enter the following:
Load O2CB driver on boot (y/n) [y] = y
Cluster stack backing O2CB [o2cb] = o2cb
Cluster to start on boot (Enter “none” to clear) [ocfs2]: = name of the cluster in cluster.conf file for this example it is myrac
Specify heartbeat dead threshold (>=7) [31] = 31
Specify network idle timeout in ms (>=5000) [30000] = 30000
Specify network keepalive delay in ms (>=1000) [2000] = 2000
Specify network reconnect delay in ms (>=2000) [2000] = 2000
Example:
[root@mylinux1 etc]# /etc/init.d/o2cb configure
Configuring the O2CB driver.
This will configure the on-boot properties of the O2CB driver.
The following questions will determine whether the driver is loaded on
boot. The current values will be shown in brackets (‘[]’). Hitting
will abort.
Load O2CB driver on boot (y/n) [y]:
Cluster stack backing O2CB [o2cb]:
Cluster to start on boot (Enter “none” to clear) [ocfs2]: myrac
Specify heartbeat dead threshold (>=7) [31]:
Specify network idle timeout in ms (>=5000) [30000]:
Specify network keepalive delay in ms (>=1000) [2000]:
Specify network reconnect delay in ms (>=2000) [2000]:
Writing O2CB configuration: OK
Starting O2CB cluster myrac: OK
[root@mylinux1 etc]#
[root@mylinux2 etc]# /etc/init.d/o2cb configure
Configuring the O2CB driver.
This will configure the on-boot properties of the O2CB driver.
The following questions will determine whether the driver is loaded on
boot. The current values will be shown in brackets (‘[]’). Hitting
will abort.
Load O2CB driver on boot (y/n) [n]: y
Cluster stack backing O2CB [o2cb]:
Cluster to start on boot (Enter “none” to clear) [ocfs2]: myrac
Specify heartbeat dead threshold (>=7) [31]:
Specify network idle timeout in ms (>=5000) [30000]:
Specify network keepalive delay in ms (>=1000) [2000]:
Specify network reconnect delay in ms (>=2000) [2000]:
Writing O2CB configuration: OK
Loading filesystem “configfs”: OK
Mounting configfs filesystem at /sys/kernel/config: OK
Loading filesystem “ocfs2_dlmfs”: OK
Creating directory ‘/dlm’: OK
Mounting ocfs2_dlmfs filesystem at /dlm: OK
Starting O2CB cluster myrac: OK
[root@mylinux2 etc]#
This completes configuration of OCFS2 for Oracle RAC.
Larry J. Catt, OCP 9i, 10g
oracle@allcompute.com
www.allcompute.com