SAN evaluation

We have just begun the process of evaluating a new SAN vendor. We are presently developing a list of criteria/requirements/questions for the new vendor. So far we have come up with the following:

1. What is their I/O speed.
2. What kind of SAN replication options do they offer.
3. Presently we are using RAID 5. I would like to move to RAID 0+1. What do they recommend?
4. Does their product have any Oracle related features. For example, I know that HP has a SAN developed specifically for an Oracle warehouse. Does their product have any bells and whistles for RAC, Streams, etc.

Has anyone gone through a similar exercise where they had to evaluate a SAN vendor? If so, could you share your thoughts with the list?

Thanks,
Tom  

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