Tuesday, February 2, 2010

Oracle 11gR2 RAC installation: install and configure OCFS2

This post will describe how to install and configure OCFS2, the Oracle Cluster File System, a shared disk file system developed by Oracle Corporation and released under the GNU General Public License.
First of all download and install on both nodes the requested rpm files from the Oracle website: http://oss.oracle.com/projects/ocfs2/files/

Then run the console using the following command as root just from one node:
ocfs2console &

Then select Cluster->Configure Nodes... from menu

and the following window will appear

Press tha ADD button

And insert all details of your node (specifing the private IP address)

Again ADD button to add details for the second node

Click the APPLY button

The select Cluster->Propagate Configuration... from menu

Type YES and the root password when asked. When FINISHED! is showned, click on CLOSE button

Now from first node type:
/etc/init.d/o2cb configure

Answer Y to load O2CB driver on boot, then use default value for cluster name, then 61 as heartbeat dead threshold and then accept all default values.

The same steps for the second node

Now it's time to format, selecting Tasks->Format from menu

A list of available devices will appear. Use a Volume label and then press OK. I will setup TWO devices to share disks

First devices is formatted

Proceed with the second one

Quit OCFS2 console

Now on both nodes, run:
mkdir -p /u02/ocfs2/
mkdir -p /u02/ocfs2_mirror/
mount -t ocfs2 -o datavolume,nointr /dev/emcpowerb1 /u02/ocfs2/
mount -t ocfs2 -o datavolume,nointr /dev/emcpowerd1 /u02/ocfs2_mirror/
echo "/dev/emcpowerb1 /u02/ocfs2/ ocfs2 _netdev,datavolume,nointr 0 0" >> /etc/fstab
echo "/dev/emcpowerd1 /u02/ocfs2_mirror/ ocfs2 _netdev,datavolume,nointr 0 0" >> /etc/fstab


Anonymous said...

Hi Marco.

I was watching the installation of OCFS2 and I have an important question for you. The IP must enter the IP must necessarily be private or public IP. I am writing this because I have seen other explanations that use the public IP also.

Mauricio Torrejon
Greetings from Chile.

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Hi Mauricio.
Yes I know. Someone uses to configure them as public IP.
Anyway there's a best practic pdf on Metalink that suggest to use them as private ip. Just let me found the exact doc id and I'll post here.

Marco V. said...

Ok.. I found it.. it was doc id 578036.1 on metalink (Error 'o2net_check_handshake ...' When Using Public Network Interface for OCFS2 [ID 578036.1])
It says in few words:
while OCFS2 does not take much bandwidth, it does require the nodes to be alive on the network and sends regular keepalive packets to ensure that they are. To avoid a network delay being interpreted as a node disappearing on the net which could
lead to a node-self-fencing, a private interconnect is recommended and one could use the same interconnect for Oracle RAC and OCFS2.


Anonymous said...

Hi Marco,

Thanks for the tip, now I prepare for the installation of Clustweware. I hope never have problems.


Anonymous said...

Hi Marco, Can you explain how the /dev/emcpowerb1 appeared (at the formatting step). It appears to be ext3 - is it already shared or clustered across the 2 nodes? As it is in your san; are you using the san to share this ext3 filesystem even before ocfs2 is installed?

I want to test ocfs2 for shared oracle datafiles using just ordinary pc hardware (local disks of course). Can this be done using OCFS2? Do I need special h/w to share the disks?

Thank you for very clear articles.

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