OCFS2 Cluster File System Setup Guide in Linux

OCFS2 Cluster File System Setup Guide in Linux


What is OCFS2?

  • OCFS2 is a shared-disk cluster file system for Linux 
  • Capable of providing both high performance and high availability.  
  • Cluster-aware applications can make use of parallel I/O for higher performance with this FS 
  • OCFS2 is mostly used to host Oracle Real application clusters (RAC) database on Linux clusters. 


The below are the high level steps for creating ocfs2 filesystem on top of a multipath'd SAN LUN:


  1. Verify the nodes that will be part of your cluster.
  2. Make sure your LUNs on the SAN end are accessible on all the nodes of the cluster.
  3. If you need multipathing, configure multipath and the multipathing policy based on solution whatever you have.
  4. The following example configuration ( /etc/ocfs2/cluster.conf ) shows you a sample configuration of a 2 node cluster pool. 
  5. If you have heartbeat IP configured on these cluster nodes, use the heartbeat IP for ocfs2 cluster communication and specify the hostname without FQDN. 
  6. Copy the same file to all the hosts in the cluster. 


Sample Config file:

[root@rac-cluster ~]# cat /etc/ocfs2/cluster.conf
        ip_port = 7777
        ip_address =
        number = 0
        name = rac-cluster
        cluster = ocfs2
        ip_port = 7777
        ip_address =
        number = 1
        name = rac-cluster
        cluster = ocfs2

On each node check the status of OCFS2 cluster service and stop "o2cb" if the service is already running. 

# service o2cb status # service o2cb stop

On each node, load the OCFS2 module. 

# service o2cb load

Make the OCFS2 service online on all the nodes. 

# service o2cb online 

Now your OCFS2 cluster is ready.


Format the SAN lun device from any one of the cluster node. 

# mkfs.ocfs2 -b 4k -C 32k -L oraclerac /dev/emcpowera


-b : Block size
-C : Cluster size
-L : Label


Update /etc/fstab on all the nodes in the cluster with the mount point. 

/dev/emcpowera /u01 ocfs2 _netdev 0 0 

Mount the /u01 


Enable ocfs and o2b service on boot

# chkconfig --level 345 o2cb on# chkconfig --level 345 ocfs2 on 

The /u01 repository setup on a SAN Lun is done.


You can now configure Oracle RAC on this file System.

0 (0)
Article Rating (No Votes)
Rate this article
There are no attachments for this article.
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
Understanding System auditing with auditd
Viewed 1064 times since Fri, Apr 5, 2019
Procedura powiekszania OCFS2 online
Viewed 530 times since Fri, Jun 8, 2018
linux ssh How to Hide the OpenSSH Version Details when Telnet to Port 22
Viewed 140 times since Wed, Apr 22, 2020
OpenSSL – sprawdzanie czy klucz pasuje do certyfikatu
Viewed 843 times since Thu, May 24, 2018
Red Hat Enterprise Linux - Allow Root Login From a Specific IP Address Only
Viewed 385 times since Wed, Oct 3, 2018
RHCS6: Show/Add GFS2/GFS journals
Viewed 768 times since Sun, Jun 3, 2018
Split and Reassemble files
Viewed 913 times since Mon, May 28, 2018
Fałszujemy rozpoznania skanerów #1
Viewed 1001 times since Mon, May 21, 2018
Tunnel SSH Connections Over SSL Using ‘Stunnel’ On Debian 7 / Ubuntu 13.10
Viewed 631 times since Fri, Sep 28, 2018
watchdog How to restart a process out of crontab on a Linux/Unix
Viewed 1465 times since Tue, Jul 31, 2018