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3.0 Preparing for the installation of RAC
The Real Application Clusters installation process includes four major tasks.
1. Configure the shared disks and UNIX preinstallation tasks.
2. Run the Oracle Universal Installer to install the Oracle9i Enterprise Edition and the Oracle9i Real Application Clusters software.
3. Create and configure your database.
3.1 Configure the shared disks and UNIX preinstallation tasks
3.1.1 Configure the shared disks
Real Application Clusters requires that all each instance be able to access a set of unformatted devices on a shared disk subsystem if GPFS is not being used. These shared disks are also referred to as raw devices. If your platform supports an Oracle-certified cluster file system, however, you can store the files that Real Application Clusters requires directly on the cluster file system.
Note: If you are using Parallel Filesystem (GPFS), however, you can store the files that Real Application Clusters requires
directly on the cluster file system !
The Oracle instances in Real Application Clusters write data onto the raw devices to update the control file, server parameter file, each datafile, and each redo log file. All instances in the cluster share these files.
The Oracle instances in the RAC configuration write information to raw devices defined for:
· The control file
· The spfile.ora
· Each datafile
· Each ONLINE redo log file
· Server Manager (SRVM) configuration information
It is therefore necessary to define raw devices for each of these categories of file. The Oracle Database Configuration Assistant (DBCA) will create a seed database expecting the following configuration:
Raw Volume File Size Sample File Name
SYSTEM tablespace 400 Mb db_name_raw_system_400m
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