Preparing Linux for Oracle Clusterware and RAC installation is made fast and simple with the help of the Oracle Validated Rpm.
The Oracle-Validated rpm automatize the install of the numerous components required to setup OCW and RAC on Linux, and execute most of the required OS configuration steps.
That was a long and tedious task on the time before the rpm was made available.
Until recently to be able to use the Oracle-Validated rpm was necessary to have an Unbreakable Linux Network (ULN) support contract. Now this valuable rpm is available to the general public. Note 728346.1 contains general information about it.
On my test I did install the rpm on Enterprise Linux 5, I did download the rpm matching my kernel from http://oss.oracle.com/el5/oracle-validated/
Enterprise Linux can be downloaded from the Oracle EDelivery site.
The following document contains details of the rpm install: Installing the Oracle-Validated rpm on EL5