Prerequisite Steps for Adding Cluster Nodes

Complete the following steps to prepare nodes to add to the cluster:

1. Make physical connections.

   Connect the nodes' hardware to the network infrastructure of your cluster. This includes establishing electrical connections, configuring network interconnects, configuring shared disk subsystem connections, and so on. See your hardware vendor documentation for details about this step.

2. Install the operating system.

   Install a cloned image of the operating system that matches the operating system on the other nodes in your cluster. This includes installing required service patches, updates, and drivers. See your operating system vendor documentation for details about this process.

   Note:

   Oracle recommends that you use a cloned image. However, if the installation fulfills the installation requirements, then install the operating system according to the vendor documentation.

3. Create Oracle users.

   You must create all Oracle users on the new node that exist on the existing nodes. For example, if you are adding a node to a cluster that has two nodes, and those two nodes have different owners for the Oracle Grid Infrastructure home and the Oracle home, then you must create those owners on the new node, even if you do not plan to install an Oracle home on the new node.

   Note:

   Perform this step only for Linux and UNIX systems.

   As root, create the Oracle users and groups using the same user ID and group ID as on the existing nodes.

4. Ensure that SSH is configured on the node.

   Note:

   SSH is configured when you install Oracle Clusterware 12c. If SSH is not configured, then see Oracle Grid Infrastructure Installation Guide for information about configuring SSH.

5. Verify the hardware and operating system installations with the Cluster Verification Utility (CVU).

   After you configure the hardware and operating systems on the nodes you want to add, you can run the following commands to verify that the nodes you want to add are reachable by other nodes in the cluster. You can also use this command to verify user equivalence to all given nodes from the local node, node connectivity among all of the given nodes, accessibility to shared storage from all of the given nodes, and so on.

   1. From the Grid_home/bin directory on an existing node, run the CVU command to obtain a detailed comparison of the properties of the reference node with all of the other nodes that are part of your current cluster environment. Replace ref_node with the name of a node in your existing cluster against which you want CVU to compare the nodes to be added. Specify a comma-delimited list of nodes after the -n option. In the following example, orainventory_group is the name of the Oracle Inventory group, and osdba_group is the name of the OSDBA group:

      $ cluvfy comp peer [-refnode ref_node] -n node_list
      [-orainv orainventory_group] [-osdba osdba_group] [-verbose]
      

   2. Ensure that the Grid Infrastructure Management Repository has at least an additional 500 MB of space for each node added above four, as follows:

      $ oclumon manage -get repsize
      

      Add additional space, if required, as follows:

      $ oclumon manage -repos changerepossize total_in_MB

      See Also:

      "OCLUMON Command Reference" for more information about using OCLUMON

   Note:

   For the reference node, select a cluster node against which you want CVU to compare, for example, the nodes that you want to add that you specify with the -n option.

After completing the procedures in this section, you are ready to add the nodes to the cluster.