How to Convert a Single-Instance ASM to Cluster ASM [ID 452758.1]

Applies to:

Oracle Server - Enterprise Edition - Version: 10.2.0.1 to 11.1.0.6
Information in this document applies to any platform.

Goal

This document describes the procedures for converting from Oracle ASM 10g single-instance to Oracle Real Application Clusters (RAC).

Solution

To convert a single-instance node using ASM to a RAC node using ASM:

1) Shut down the database instance, the ASM instance, and the listener.

Remove the CSS auto-start line from the /etc/inittab file to enable you to shut down and uninstall CSS.

2) Follow the instructions in Chapter 2 and Chapter 3 (Oracle® Database Oracle Clusterware and Oracle Real Application Clusters Installation Guide <platform>) to configure each node that you want to have as a cluster member.

http://www.oracle.com/pls/db102/portal.portal_db?selected=3#index-ORA

3) If any cluster member node has had previous versions of Oracle clusterware (Cluster Ready Services or Oracle Clusterware) installed, then ensure that you remove the file ocr.loc on any node that has been labeled previously as a cluster node. The file ocr.loc is in /etc/oracle.

4) Log in as the oracle user, and run DBCA in silent mode to deconfigure ASM. To run DBCA in silent mode, navigate to the directory $ORACLE_HOME/bin and use the following command syntax on the local node:

dbca -silent -deleteASM

You can de-install the single-instance ASM without losing data.

5) Install Oracle Clusterware on all nodes you intend to have as cluster members, following the directions in Chapter 4 (Oracle® Database Oracle Clusterware and Oracle Real Application Clusters Installation Guide <platform>).

http://www.oracle.com/pls/db102/portal.portal_db?selected=3#index-ORA

6) Install Cluster ASM using DBCA. At the Node Selection page, select all the cluster member nodes for which you intend to use ASM to manage storage. When the ASM Disk Groups page prompts you to select disk groups, select the existing disk groups you used with the single-instance ASM instance that you deleted in step 4.

7) Start up the single-instance Oracle Database.

From Oracle

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