Question about Sun disk space configuration for large Oracle database

Greetings.

I am currently developing the physical disk space layout for a large Oracle database (over 2 terabytes of disks), and I wish to solicit some opinions as to how to make this work. My configuration calls for each Oracle tablespace to be placed on separate RAID 0+1 arrays. Each RAID array would be controlled
by its own RAID controller. There are 13 such arrays and the largest of these
arrays needs to be at least 550 Gigs. The system administrator with whom I am working on this project has reviewed Sun hardware specs and has come to the conclusion that 13 RAID controllers is not do-able. Instead, he recommends using fewer RAID controllers and allowing each one to control multiple arrays. I am primarily concerned with reducing I/O contention for the Oracle tablespace files and wonder if a single RAID controller can handle
multiple requests for different arrays in parallel. There is another problem in that, according to his analysis, each RAID 0+1 array can accomodate, at most, 8 disks. Assuming 36 gig disks, this would mean that the largest size of a single RAID 0+1 array would be 144 gigs (4x36), significantly less than my 550 gig target. Below, you will see my proposed physical layout for each partition and its use. My questions for the Sun/Oracle experts are as follows...

1. If I allow a single RAID controller to handle multiple arrays, how can I minimize I/O contention to those arrays. Can a single RAID controller handle multiple requests to different arrays in parallel?
2. How do I set up a partition of 550 gigabytes? Can a single array be composed of 32 disks (assuming RAID 0+1 with 36 gig disks)?
3. Specifically for the Oracle DBAs, would you recommend any changes to the proposed configuration to improve performance?
4. If you were in my shoes, how would you do it? What specific Sun hardware should be used?

My company's upper management does not have the time right now (due to a very tight product development schedule) to bring in Sun reps to get answers to these questions, so I greatly appreciate whatever assistance the USENET community can provide.

PROPOSED CONFIGURATION

Dir    Size     Usage                       Recommendation
----   -----    -------------------------   -----------------


/      50 GB    All system software         Four(4) 36 GB dsks RAID 0+1

/u01   2 GB     First Online Redo Logs      Part of root (/)

/u02   2 GB     System tablespace           Two(2) 36 GB dsks RAID 0+1

/u03   6 GB     Temporary tablespace        Two(2) 36 GB dsks RAID 0+1

/u04   100 GB   Archived redo & exports     Six(6) 36 GB dsks RAID 0+1

/u05   2 GB     Second Online Redo Logs     Two(2) 36 GB dsks RAID 0+1

/u06   8 GB     Rollback for Data 1         Two(2) 36 GB dsks RAID 0+1

/u07   8 GB     Rollback  segments          Two(2) 36 GB dsks RAID 0+1

/u08   80 GB    Indexes for Data 1          Six(6) 36 GB dsks RAID 0+1

/u09   550 GB   Data 1                      Thirty-two(32) 36 GB dsks RAID

0+1


/u10   12 GB    Indexes for Data 2          Two(2) 36 GB dsks RAID 0+1

/u11   60 GB    Data 2                      Four(4) 36 GB dsks RAID 0+1

/u12   4 GB     Indexes for Data 3          Two(2) 36 GB dsks RAID 0+1

/u13   8 GB     Data 3                      Two(2) 36 GB dsks RAID 0+1