This one maybe one of the best RAC setup articles of all times – Oracle 11g RAC on Oracle Enterprise Linux 4(Update 5) and VMware Server 1.0.3 by Frederik Visser
Oracle 11g RAC on Oracle Enterprise Linux 4(Update 5) and VMware Server 1.0.3
Extract(Read) > Transform(Test&Apply) > Load(Learn) Blog
H.Tonguç Yılmaz
Extract(Read) > Transform(Test&Apply) > Load(Learn) Blog 
Upgrading to Oracle RAC 11g on Oracle Enterprise Linux By Vincent Chan
http://www.oracle.com/technology/pub/articles/chan-upgrade.html?rssid=rss_otn_news
Learn how to upgrade Oracle RAC 10g Release 2 to Oracle RAC 11g on Oracle Enterprise Linux 5, step by step.
Published October 2007