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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 15 - RAC Migration Topics

Adding Nodes at the Vendor Clusterware Layer in UNIX/Linux

  • That the nodes are up

  • That the nodes are accessible by way of the network

  • That the user has write permission to create the CRS home on the new nodes

  • That the user has write permission to the OUI inventory in the oraInventory directory on UNIX/Linux or Inventory directory on Windows

  1. When the OUI detects that the new nodes don't have an inventory location, then:

  • On UNIX/Linux platforms the OUI displays a dialog asking you to run the script on the new nodes

  • On Windows platforms the OUI automatically updates the inventory location in the proper Registry key (no special script is required)

When any verifications fail, the OUI will re-display the Specify Cluster Nodes for Node Addition screen with the Status column in both upper and lower tables indicating the errors that occurred. Correct the errors or if correction is not possible, deselect the nodes that have errors and proceed. However, if the errors are on existing nodes, they cannot be deselected; the errors must be corrected if nodes are already part of your CRS cluster before you can proceed with node addition. When all the checks succeed, then the OUI Node Addition Summary screen is displayed. 

It is a good practice to install CRS on every node in the cluster that has vendor clusterware installed.

  1. The Node Addition Summary screen displays information about the products that are installed in the CRS home that is being extending to the new nodes, the information shown is:

  • The source directory for the add node process, which should be the CRS home

  • The private node names (interconnects) that where entered for the new nodes

  • The new nodes that where entered

  • The required space and the available space on the new nodes

  • The installed products listing the products that are installed in the existing CRS home.

If everything is satisfactory, then click Next and the OUI displays the Cluster Node Addition Progress screen.

  1. The purpose of the Cluster Node Addition Progress screen is to show the status of the cluster node addition process. The table shown on this screen displays two columns showing the phase of the node addition process and the phase's status according to the following platform-specific content:

For UNIX/Linux-based systems, this screen shows four OUI phases:

  • Instantiate Root Scripts - This phase instantiates with the public and private node names that you entered on the Cluster Node Addition page.

Get the complete Oracle10g story:

The above text is an excerpt from "Oracle 10g Grid & Real Application Clusters", by Rampant TechPress.  Written by top Oracle experts, Mike Ault and Madhu Tumma, this book has a complete online code depot with ready to use scripts. 

To get the code instantly, click here:

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