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Overview
Setting up a shared file system on SAN with OCFS2
Requirements & Scenario
Two High Availability Centos servers sharing same SAN partition
Server 1 (192.168.1.1) |————| SAN |————-| ( 192.168.1.2) Server 2
Objective
Installation of OCFS2 filesystem, a shared cluster file system on SAN partition for parallel I/O
Configuration
Follow all these steps on the two server except the one step specifically mentioned.
Step 1
Install OCFS2 packages. You have to follow the same steps on the two clustered servers.
root@serv:~# yum install glib2-devel.x86_64 e2fsprogs-devel.x86_64
root@serv:~# wget http://oss.oracle.com/projects/ocfs2/dist/files/RedHat/RHEL5/x86_64/1.4.7-1/2.6.18-194.el5/ocfs2-2.6.18-194.el5-1.4.7-1.el5.x86_64.rpm
root@serv:~# wget http://oss.oracle.com/projects/ocfs2-tools/dist/files/RedHat/RHEL5/x86_64/1.4.4-1/ocfs2-tools-1.4.4-1.el5.x86_64.rpm
root@serv:~# wget http://oss.oracle.com/projects/ocfs2-tools/dist/files/RedHat/RHEL5/x86_64/1.4.4-1/ocfs2-tools-devel-1.4.4-1.el5.x86_64.rpm
root@serv:~# rpm -ivh ocfs2-tools-devel-1.4.4-1.el5.x86_64.rpm ocfs2-tools-1.4.4-1.el5.x86_64.rpm ocfs2-2.6.18-194.el5-1.4.7-1.el5.x86_64.rpm
Step 2
Formatting partition. Format the san partition from one of the nodes ( do this from only one of the servers )
root@serv:~# mkfs.ocfs2 /dev/sdc1
Step 3
Edit fstab and add the partition
root@serv:~# vi /etc/fstab
/dev/sdc1 /dir ocfs2 _netdev 0 0
Step 4
Configuring the ocfs2 . Add the below lines to /etc/ocfs2/cluster.conf
root@serv:~# mkdir /etc/ocfs2
root@serv:~# vi /etc/ocfs2/cluster.conf
node:
ip_port = 7777
ip_address = 192.168.1.1
number = 0
name = node1.cluster.com
cluster = ocfs2
node:
ip_port = 7777
ip_address = 192.168.1.2
number = 1
name = node2.cluster.com
cluster = ocfs2
cluster:
node_count = 2
name = ocfs2
set O2CB_ENABLED as true on /etc/default/o2cb
root@serv:~# vi /etc/default/o2cb
O2CB_ENABLED=true
Step 5
Configure o2cb, O2CB is the cluster stack of ocfs2 and it need to be configured before starting ocfs2
remove the below lines from /etc/init.d/o2cb
root@serv:~# vi /etc/init.d/o2cb
### BEGIN INIT INFO
# Provides: o2cb
# Required-Start:
# Should-Start:
# Required-Stop:
# Default-Start: 2 3 5
# Default-Stop:
# Description: Load O2CB cluster services at system boot.
### END INIT INFO
root@serv:~# chkconfig –del o2cb
root@serv:~# /etc/init.d/o2cb offline ocfs2
root@serv:~# /etc/init.d/o2cb unload
root@serv:~# /etc/init.d/o2cb configure
Hit enter for the questions asked and it will keep the default value
root@serv:~# /etc/init.d/o2cb load
root@serv:~# /etc/init.d/o2cb online ocfs2
root@serv:~# /etc/init.d/ocfs2 start
root@serv:~# chkconfig –add o2cb
root@serv:~# chkconfig –add ocfs2
You have configured the cluster filesystem, try some write checks from two servers on the clustered partition, keep an eye on the logs also.
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