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=> Yes you can have multiple versions of RDBMS. For each RDBMS version you will need a separate ORACLE_HOME.
=> You can only have one version of ASM and clusterware, and they should (ASM) and must (OCW) be the newest in the stack.
See the following MOS notes for more information:
-> Oracle Clusterware - ASM - Database Version Compatibility (Doc ID 337737.1)
-> Pre 11.2 Database Issues in 11gR2 Grid Infrastructure Environment (Doc ID 948456.1)
Also make sure you use the correct ASM compatibility level in your diskgroup to support the correct DB versions and have new ASM functionalities enables:
There are no restrictions on OS other than the depending requirement for each release.
You may hit the limit though for example if you want to use RHEL6. 126.96.36.199 is certified, 10.2.0.2 not, hence you will not be able to use RHEL6 for 10.2 and 11.2.
So you should first check which Linux/Solaris version is generally supported. You probably are safe if using the latest OL 5 and Solaris 10.
yes you can
Grid Infrastructure (ASM, clusterware) version must be always higher or equal than the highest database version in the cluster
you can have different versions/database running on the same cluster (but instances at the nodes for the same database of course must be at same version)
if you want to run 10g databases, you should choose Oracle Linux 5.8 or Solaris 10 as operating system (OL 6/Solaris 11 is supported only starting with 188.8.131.52)