Disabling ODM Library (Optional) for Databases Using Raw Devices

By default, the linkrac9i command links all libraries, including the ODM library, with Oracle. You must use the ODM library for a database using a cluster file system; a VERITAS cluster file system requires the ODM library. If the database uses a raw device rather than a cluster file system, ODM is optional.

ODM supports kernel asynchronous I/O. If you choose to disable the ODM library, VERITAS recommends enabling the kernel asynchronous I/O driver of HP-UX by following the instructions in the Oracle Administrator's Reference Release 2 for UNIX Systems or the following document:

Oracle Metalink Document Id. Note:139272.1

Search on: 139272.1 HP-UX: Asynchronous i/o

The Oracle DISK_ASYNCH_IO configuration parameter, which configures the Oracle database to use asynchronous I/O to reduce CPU utilization and improve transaction throughput, is set to true by default.

To disable the VERITAS ODM library:

1. Log in as oracle user.
2. Change directories:
     $ cd   $ORACLE_HOME/lib
3. Remove the file linked to the VERITAS ODM library.

   For PA systems:

   
     $ rm libodmd9.sl

   For IA systems:

   
     $ rm libodmd9.so
4. Copy the $ORACLE_HOME/lib/libodmd9.sl file to disable the ODM library.

   For PA systems:

   
   $ cp $ORACLE_HOME/lib/libodmd9.sl.oracle
   $ORACLE_HOME/lib/libodmd9.sl

   For IA systems

   
   $ cp $ORACLE_HOME/lib/libodmd9.so.oracle
   $ORACLE_HOME/lib/libodmd9.so