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i think you should use a dedidcated diskgroup for the cluster like DG_CLUSTER with other den external redundancy. You also mirror your control files or your redo log files, why not mirror your ocr or your voting files?
You can also change your redundancy level (more than one failgroup) with one storage in the backend.
Edited by: phaeus on 21.01.2013 23:04
You can use another Diskgroup than DATA, like "OCR" or something like that. It doesnt matter if you are using external (sotrage) or normal (ASM) redundancy, as long as you use redundancy... that is important... You can use a diskgroup with a little space to store your OCR files.
Control Files redundancy is good Idea as mentioned on last post....