How to Configure Shared Memory for the Oracle Real Application Clusters Software

To enable the Oracle Real Application Clusters software to run correctly, you must ensure that sufficient shared memory is available on all of the cluster nodes. Perform this task on each cluster node.

Steps

1. Become superuser on a cluster node.

2. Update the /etc/system file with the shared memory configuration information.

   You must configure these parameters on the basis of the resources that are available in the cluster. However, the value of each parameter must be sufficient to enable the Oracle Real Application Clusters software to create a shared memory segment that conforms to its configuration requirements. For the minimum required value of each parameter, see your Oracle documentation.

   The following example shows entries to configure in the /etc/system file.

   *SHARED MEMORY/ORACLE set shmsys:shminfo_shmmax=4294967295 set semsys:seminfo_semmap=1024 set semsys:seminfo_semmni=2048 set semsys:seminfo_semmns=2048 set semsys:seminfo_semmsl=2048 set semsys:seminfo_semmnu=2048 set semsys:seminfo_semume=200 set shmsys:shminfo_shmmin=200 set shmsys:shminfo_shmmni=200 set shmsys:shminfo_shmseg=200 set semsys:seminfo_semvmx=32767

3. Shut down and reboot each node whose /etc/system file you updated in Step 2.

   ---

   Caution –

   Before you reboot, you must ensure that you have correctly installed your volume manager packages. If you use VxVM, check that you have installed the software and that the license for the VxVM cluster feature is valid. Otherwise, a panic will occur. For information about how to recover from a node panic during installation, see Node Panic During Initialization of Sun Cluster Support for Oracle Real Application Clusters.

   ---

   For detailed instructions, see Shutting Down and Booting a Single Cluster Node in Sun Cluster System Administration Guide for Solaris OS.

Next Steps

Go to Installing Sun Cluster Support for Oracle Real Application Clusters Packages.