How many LUNs

Folks,
I am seasoned in both RAC and ASM. I'm helping my team come up with a standard approach to LUN assignments and ASM disk group creation for Oracle 11.2. The Oracle documentation is quite simplistic and doesn't seem to cover things like mirror splits for restoration, etc....
My proposed ASM disk group and LUN assigments are as follows:
OCR: 1 LUN external redundancy (OCR can be mirrored by Oracle to another diskgroup) Size: 1GB
Vote: 1 LUN external redundancy (Vote disks can be mirrored by Oracle to another diskgroup) Size: 1GB
Data: 4 or more LUNs external redundancy Size: TBD
FRA: 4 or more LUNs external redundancy Size: Depends on Data LUN and backup retention.
Logs: 4 or more LUNs external redundancy(for online logs, and specifically to support shadow copy) Size: Depends on online log file size. Assume 1GB per log group, minimum of 5 groups x N RAC nodes.
I cannot agree with Oracle to put the OCR and Vote Disks in the Data disk group. That, in my opinion is simplistic and not well thought out by the documentation folks at Oracle.
Opinions welcome,
--Rich

Hi Rich,
there are pro and cons to put OCR and Voting in the data diskgroup. However if you plan to do mirror splits of the database, then it is definitely better to have your own diskgroup for OCR and Voting. (You do not want to mirror split your voting as well).
However I would always put the OCR and Voting into the same diskgroup. (It does not make sense to use different diskgroups for OCR and Voting disks).
Furthermore if you would like to do mirror split, than I would advice a diskgroup per database. (But you definitly thought about that already)
Just one comment: Vote disks cannot be mirrored by Oracle to another diskgroup! Voting Disks can only be in one diskgroup.
So I would personally change the placement of OCR and Voting:
OCR + VOTE: 3 LUNs (to have triple voting disks, which will only work with normal redundancy diskgroup). Size Each: 1GB
- where you put you additional OCR copies is up to your liking...
FRA: also depends on the amount of flashback logs and flashback retention time, if you enabled flashback. Maybe you want to put a copy of the online redolog into the FRA as well.
Sebastian

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