RAC File System Questions

We are in the process of setting up Oracle RAC on Redhat Linux.  

I need RAC expert's comments for the following questions.  

1. What type of filesystem are you using for Oracle datafiles?
2. Are your implementation(s) using raw partitions or a cluster file system for the OCR and voting disks?
3. If using raw partitions with Linux can you describe any challenges you had with device discovery?

Thanks,

Rama  

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