Make sure the cluster service is not running on any members before performing the following procedure.
If you are currently running cluster services on Red Hat Enterprise Linux 2.1 and you want to install Red Hat Enterprise Linux 3 on your system while preserving your cluster configuration, perform the following steps on the Red Hat Enterprise Linux 2.1 system to backup the cluster configuration before installing Red Hat Enterprise Linux 3:
Stop the cluster service by invoking the command service cluster stop on all cluster members.
Remove the cluster database file (/etc/cluster.conf) from all members, saving a copy with a different name (for example, /etc/cluster.conf.sav) to a separate running system or portable storage such as a diskette.
Reinstall the Red Hat Enterprise Linux 2.1 system with Red Hat Enterprise Linux 3 on all members.
Install the Red Hat Cluster Suite using the method described in Section 3.1 Installing the Red Hat Cluster Suite Packages.
On all members, install the applications to be managed as services by the cluster software.
Restore the cluster database file you saved in step 2 to one member, naming the file /etc/cluster.conf.
Invoke the /usr/sbin/cluster-convert command to convert the /etc/cluster.conf to /etc/cluster.xml.
Configure shared storage on the cluster member by running /usr/sbin/shutil -i which initializes the shared storage. Then run /usr/sbin/shutil -s /etc/cluster.xml to read the shared storage information from the file and write it to the shared state.
Start the cluster service on this member using the command /sbin/service clumanager start.
Copy the /etc/cluster.xml file to the other member using the scp command.
Start the cluster service on the other members.