Cloning Oracle RAC to Nodes in a New Cluster

Learn how to clone Oracle Real Application Clusters (Oracle RAC) database homes on Linux and Unix systems to nodes in a new cluster.

Introduction to Cloning Oracle RAC

Cloning Oracle RAC copies an existing, patched Oracle home to another location and adapts it to the target environment, enabling fast, silent, repeatable deployment across multiple cluster nodes. It is especially useful for simultaneously installing many clusters or reproducing fully patched production, test, or development environments, although traditional interactive installers are preferable for a single cluster. Cloned homes retain source-applied one-off patches, can themselves serve as future clone sources, and may be customized for settings such as port assignments. The process copies only files within the source Oracle home, relinks binaries for the destination system, and may change file counts and binary sizes; it does not replace Oracle Enterprise Manager Provisioning Pack, which provides interactive and automated provisioning workflows for larger data centers.

Preparing to Clone Oracle RAC

Preparing an Oracle RAC clone involves installing the software-only Oracle RAC home, applying the required Release Update and any one-off patches, and creating a backup archive of the prepared home, preferably with the release number in its filename. Before deploying the clone, Oracle Clusterware must be installed and running on every target node, with the target environment configured in the same sequence as the source cluster. The archived Oracle home is then available for copying to one or more destination nodes.

Deploying Oracle RAC Clones to Nodes in a Cluster

Deploying a clone requires preparing each target node with the platform-specific prerequisites, active Oracle Clusterware, active Oracle ASM, and a mounted ASM disk group, then extracting the Oracle home and correcting ownership when necessary. Remove source-specific network configuration and obsolete database files before registering the home, either through a software-only installer run or the parameter-sensitive clone.pl script, which accepts Oracle home, base, home-name, operating-system group, cluster-node, and local-node settings. On Linux and UNIX, run root.sh as root after cloning on every node, ensuring completion before continuing; finally, run DBCA from one node to create and register RAC instances across the cluster, configure storage and database options, and create the database.

Locating and Viewing Log Files Generated During Cloning

Oracle RAC cloning invokes several tools that generate diagnostic logs. Oracle Universal Installer activity and errors are recorded under the central inventory in cloneActions and oraInstall log files, while pre-cloning and cloning activity and errors are recorded in $ORACLE_HOME/clone/logs as clone and error logs. The central inventory location is identified through /var/opt/oracle/oraInst.loc on most UNIX systems, /etc/oraInst.loc on Linux and IBM AIX, and the standard Oracle Inventory directory under C:\Program Files\Oracle\Inventory on Windows.