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Not sure I understood your first question.
To the second question:
I recommend first that you review that requirement (creating diskgroups for each database). The standard approach is to spread all databases across the same (2) diskgroups DATA & RECO.
If you insist on your strategy then yes, that can be done with Storage Security.
See here for details:
Thank you Uwe,
about my first question. As we haven´t an environment for testing patches and upgrades, the only way is to apply patches directly on the production environment with all risks it implies to. Mi idea consists of a separate little partition or split the 1/4 rack and use it for testing. The basis for the idea is:
however my Exadata is 1/4, not a half. Do you think is it possible?.
The smallest configuration possible with Exadata (if you want a redundant configuration) is to have 3 storage servers. Because that is all that's in your environment, you can't really divide it further. ASM on Exadata is configured so that each cell is a failure group. Because a diskgroup containing OCR and voting files requires 3 failure groups for normal redundancy, you need 3 storage servers. On a quarter rack, there really isn't anywhere to create an environment to isolate for storage server patching.
Remember that bundle patches can be applied to non-Exadata databases. While you won't really be able to test all functionality with them, you can practice applying them.
Thank you Andy, very clear explanation.
And the last one (I promise ...). Does anyone know if vm image will be public?, this question is intended for Oracle employees. I think it is very important a test software for testing. In my case, with an only quarter of rack and without development environment it is very necessary to avoid risks and I suppose this problem is shared by many customers.
Thank you for you help, very userful.