Multiple oracle databases in Oracle 11gR2 RAC

Hello Oracle RAC Gurus,
I need your advice in my setup on Unix platform.
I am planning to build high availability databases with Oracle RAC 11gR2. These databases may have different versions 11.1.0.6 and 11.1.0.7 and 11.2.0.1 ..
Now from this [thread |http://forums.oracle.com/forums/thread.jspa?threadID=1042187&tstart=0] earlier in this forum, I can understand I can have the same Oracle User for the database and one user for the CRS and ASM, and that CRS and ASM homes should be in a higher version of the oracle databases implemented, so the configuration could look like this:
CRS running on 11.2.0.1
ASM running on 11.2.0.1
DB1 running on 11.2.0.1 from ORACLE_HOME1
DB2 running on 11.1.0.7 from ORACLE_HOME2
My questions are:
1) Is this the best practice to have oracle databases in one RAC setup ?
2) Do I need a different oracle inventory for each version with different oracle inventory path ?
3) Would this setup will have patching difficulties and disadvantages ?
4) If I want to do the Data guard setup for this implementation, shall I perform the usual RAC/RAC setup or are there any consideration I have to put in mind?
Kindly advice,
Regards,
C

1) Is this the best practice to have oracle databases in one RAC setup ?
We have 11.2 infrastructure with 11.2 and 10.2.0.4 databases running from 2 db homes.
2) Do I need a different oracle inventory for each version with different oracle inventory path ?
Only one inventory
3) Would this setup will have patching difficulties and disadvantages ?
Less databases makes it less complicated. Many argue that a cluster should only have one db. We've patched our multi version environment without any issues.
4) If I want to do the Data guard setup for this implementation, shall I perform the usual RAC/RAC setup or are there any consideration I have to put in mind?
A RAC to RAC dataguard setup should work fine. Your standby should be indentical to your primary.
-Rich

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