Oracle ASM installation consists of installing and creating an Oracle ASM instance and configuring the required Oracle ASM disk groups. An Oracle ASM disk group is a collection of disk devices to store data files that Oracle ASM instances manage as a unit. Oracle ASM instances mount disk groups to make Oracle ASM files available to database instances.
You should decide the type of Oracle ASM instance you want to use. You can use Oracle ASM instance as single instance Oracle ASM or clustered Oracle ASM using Oracle Clusterware instances. For information on how to choose the appropriate Oracle ASM instance, see Choosing the Appropriate Oracle ASM Instance.
Note - Single instance Oracle ASM is not supported with Oracle 11g release 2.
If you are using clustered Oracle ASM, you should first install the Oracle Clusterware software and then install Oracle ASM. If you are using clustered Oracle ASM on SPARC, you should also install the ORCLudlm package before installing Oracle ASM.
When you run Oracle Universal Installer, you have the option to configure and install Oracle ASM and create disk groups. For detailed information on installing and configuring Oracle ASM, see the Oracle documentation corresponding to the Oracle database version you are using.
When you create the same disk group with Oracle ASM on different cluster nodes, you must create the disk group one node at a time and dismount the disk group before creating the same disk group on another cluster node.
Note - You should set up and configure the file system, where the Oracle ASM ORACLE_HOME resides, before performing the Oracle ASM installation. Use only a local file system for the Oracle ASM home.