Grid Infrastructure is to be installed and configured before the RDBMS.
In 11.2, ASM is bundled with Grid Infrastructure (different from 11.1) So, in 11.2 you'd install GI+ASM even for a non-RAC environment.
Hemant K Chitale
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Please follow below links.
Step by Step installation of RAC on Linux ---> "Oracle® Real Application Clusters Installation Guide 11g Release 2 (11.2) for Linux and UNIX" (http://docs.oracle.com/cd/E11882_01/install.112/e24660/toc.htm)
Link to download Grid Infrastructure Software - http://www.oracle.com/technetwork/products/clusterware/downloads/index.html?ssSourceSiteId=ocomen
Link to download Database Software - http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html?ssSourceSiteId=ocomen
Thanks for the kind reply. Please let me know the difference between single and mutinode RAC installation. Because have option to install single node RAC.
Please show the diffrences.
Its called "oracle one node rac" you will find plenty of documents on metalink, extract is below, hope this helps you to understand the differences.
Oracle RAC Database : Oracle RAC database is a clustered database. It can have more than one instance running on one or more hosts. To make is database RAC , there is another software needs to be installed called Oracle Grid infrastructure which takes care of multinode sync, ASM, Oracle restart etc. Oracle GI is necessary as a base of Oracle RAC. In Oracle RAC, the load is balanced across multiple instance of databases running on different nodes. This is best for Production database. Failure of any instance is abstracted from user and forwarded to another instance from the database server pool. No of instances can be controlled using Policy Managed or Admin Managed.
Oracle RAC One Node : Some time we need to have RAC databases but donot need many instances, why? Simple answers to it is leverage the high availability of RAC. The Oracle RAC One node is a RAC DB runs on one host. The advantage is it saves your resource, can to converted to full RAC any time, Cluster fail over i.e. the Database instance is moved to new instance in case of any failure on host known as Instance Relocation,easy to upgrade etc. This type of database is well suited for small production and dev/test environments.