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Pro Oracle Database 11g RAC on Linux by Martin Bach, Steve Shaw

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Chapter 7. Grid Infrastructure Installation

In Oracle 10g and 11.1, installing Oracle RAC can be a two- or three-stage process. The recommended configuration is to install the Oracle Clusterware, ASM, and RDBMS software in three separate Oracle homes. Oracle Clusterware must be in a separate Oracle home for architectural reasons. However, Oracle recommends that ASM and RDBMS be separated to provide more flexible options during upgrades. For many sites, the ASM and RDBMS software is identical; however, it is still common for users not requiring this level of flexibility to install ASM and RDBMS in the same Oracle home.

Prior to Oracle 11.2, the order of installation was therefore Oracle Clusterware, ASM (if required), and finally, the RDBMS software. ...

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