Hetrogenous RAC - is it possible ?

Is it possible to compose a RAC Cluster using nodes runing different OS's ( I suspect the answer is no ) but I want to tease out a couple scenarios
I recall challenging Oracle on their Grid concept (I suppose really now replaced with their cloud concept ) which was lauded as being able to add in any spare servers to consolidate processing power. I then asked the question could you therefore combine a Windows Server with unix server in regards to the processor grid. In pure grid theory the answer should be yes but when pressed Oracle they admitted no.
Q1. So I am guessing the same is true of RAC - I suspect you could not have one node as Windows and another node as unix ( the difference in the file path specification alone would surely scupper it ).
Q2. What about a unix node and a linux node ?
Q3. What about binary compatible nodes eg one node being RHEL and the other being OEL ?
Q4. Finally what about 2 nodes that were the same OS but had a slight different version of ORACLE_HOME eg 11gR1 and 11gR2 ?
any thoughts appreciated,
Jim

Jimbo wrote:
I recall challenging Oracle on their Grid concept (I suppose really now replaced with their cloud concept ) which was lauded as being able to add in any spare servers to consolidate processing power. I then asked the question could you therefore combine a Windows Server with unix server in regards to the processor grid. In pure grid theory the answer should be yes but when pressed Oracle they admitted no.RAC is not Cloud. Despite what the marketing suits may spin.
Q3. What about binary compatible nodes eg one node being RHEL and the other being OEL ? Yes. In fact did this recently on a test cluster. Not a good idea though (obviously) as there can be some kernel driver issues (e.g. ADVM of 11.2.0.2 runs on 5.4 kernel and not on the 5.7 kernel). Also makes o/s management more complex. I'm a big believer that each and every server node in a Grid/RAC needs to be identical at o/s level. Same kernel version, same drivers, same rpm's, same +/etc+ configs (such as hosts, multipath, udev) and so on.
Q4. Finally what about 2 nodes that were the same OS but had a slight different version of ORACLE_HOME eg 11gR1 and 11gR2 ?Well, you can have multiple Oracle Homes on the same server. So you should be able to have a 10 node Grid, policy managed RAC, server pool 1 running a 10gr2 RAC database as 5 instances, and server pool 2 running a 11gr2 RAC database as 5 instances. Offhand I do not see why this would not be possible.
Some years ago (due to circumstances) I had another Oracle Home on node 1 of a 4 node RAC, running a standalone Oracle db instance on the RAC sever node that was running RAC db instance 1. (since has moved that to its own dedicated server). So I do not see why this 2nd Oracle Home could not run another RAC db version...
any thoughts appreciated,Well, the obvious thought is why do you want to throw heterogeneous stuff together into an Oracle RAC? To achieve what need, and address which requirement, exactly?

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Hetrogenous RAC - is it possible ?

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