Oracle has recently certified RHEL6 for 18.104.22.168 or higher version. Read
Certification Information for Oracle Database on Linux x86-64 [ID 1304727.1] for more information.
The requirements for RHEL6 are given in the following metalink note
Requirements for Installing Oracle 11gR2 RDBMS on RHEL6 or OL6 64-bit (x86-64) [ID 1441282.1]
Oracle documentation has also been updated to reflect RHEL6 requirements. One minor adjustment is needed to run the 22.214.171.124 installer if not following pre-req failure will appear.
To remove this change the CV_ASSUME_DISTID entry in cvu_config file (located in database/stage/cvu/cv/admin) from
More information regarding this is available in
Installing 126.96.36.199 64-bit (x86-64) on RHEL6 Reports That Packages "elfutils-libelf-devel-0.97" and "pdksh-5.2.14" are missing (PRVF-7532) [ID 1454982.1]
Apart from this there is no other considerable difference when it comes to installing Oracle in RHEL 6 compared to other RHEL versions.
When it comes to asmlibs they will have to be downloaded from unbreakable linux site and will not be issued for kernels distributed by RedHat. More on this
Oracle ASMLib Software Update Policy for Red Hat Enterprise Linux Supported by Red Hat [ID 1089399.1]
Same goes for ocfs2 and REHL 6 as well.
Oracle Cluster File System (OCFS2) Software Support and Update Policy for Red Hat Enterprise Linux Supported by Red Hat [ID 1253272.1]
Installing 11gR2 (188.8.131.52) GI with Role Separation on RHEL 6
Installing 11gR2 (184.108.40.206) GI with Role Separation on OEL 6
Installing 11gR2 Standalone Server with ASM and Role Separation on RHEL 6
Installing 12c (220.127.116.11) RAC on RHEL 6 with Role Seperation - Clusterware
Installing 18.104.22.168 Standalone Server with ASM and Role Separation on RHEL 7