test

Sun Cluster 3.1 Data Service for SAP

How to Enable Failover SAP Instances to Run in a 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). Use this procedure to enable SAP to run in a cluster.

  1. Make backup copies of the files you will modify in Step 5 through Step 8.

  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. Are you using SAP 6.10 or SAP 6.20?

  5. Make a copy of the startsap script and the stopsap script, and save these files in the SAPSIDadm home directory. The filenames that you choose must specify this instance.


    # cp /usr/sap/SID/SYS/exe/run/startsap  \
$SAPSID_HOME/startsap_logical-hostname_instance-number
# cp /usr/sap/SID/SYS/exe/run/startsap \
$SAPSID_HOME/stopsap_logical-hostname_instance-number

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

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

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

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

  7. 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).

    For Application Server:


    SAPLOCALHOST=as-logical-hostname

  8. 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.

  9. 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 Configuring Sun Cluster HA for DBMS.