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Sun Cluster 3.0 5/02 Supplement

How to Enable Failover SAP Instances to Run in the Cluster

During SAP installation, the SAP software creates files and shell scripts on the server on which you installed the SAP instance. These files and scripts use physical server names. To run the SAP software with Sun Cluster software, replace references to a physical server with references to a network resource (logical hostname). Throughout these steps, the term physicalserver represents a physical server, and the term logical-hostname represents a network resource.

To enable failover SAP instances to run in the cluster, perform the following steps.

  1. Make backup copies of the files that you will modify in the following steps.

  2. Log in to the node on which you installed the SAP software.

  3. Shut down the SAP instances (central instance and application server instances) and the database.

  4. Become user sapsidadm, and then perform the following tasks.

    1. In the SAPSIDadm home directory, modify all of the file names that reference a physical server name.

    2. In the SAPSIDadm home directory, modify all of the file contents-except log file contents-that reference a physical server name.

    3. In the SAP profile directory, modify all of the file names that reference a physical server name.

  5. As user sapsidadm, add entries for the parameter SAPLOCALHOST.

    Add this entry to the SAPSID_Service-StringSystem-Number_logical-hostname profile file under the /sapmnt/SAPSID/profile directory.

    For Central Instance:


    SAPLOCALHOST=ci-logical-hostname

    This entry enables the external application server to locate the central instance by using the network resource (logical hostname or shared address).

    For Application Server:


    SAPLOCALHOST=as-logical-hostname

  6. Become user orasapsid, and then perform the following tasks.

    • In the oraSAPSID home directory, modify all of the file names that reference a physical server name.

    • In the oraSAPSID home directory, modify all of the file contents-except log file contents-that reference a physical server name.

  7. Ensure that the /usr/sap/tmp directory owned by user sapsidadm and group sapsys exists on all nodes that can master the failover SAP instance.

Where to Go From Here

Go to "How to Verify SAP and the Database Installation with Central Instance".