Based on my testing you need to support at least 2500 IOPS per processor core. If you had 8 physical (non hyperthreaded) cores this is 20,000 IOPS. When you get to these speeds you leave physical disks in the dust very quickly.
Look at either Intel 910 SSD or Fusion I/O to really give the amount of IOPS to fully utilize your processors.
If you think about the pure number of physical disks to meeting 20,000 IOPS you start to need over 50 physical disks using at least RAID 10 and even then you are hitting less than 5,000 IOPS so are still a far cry from the amount of bandwidth you require. Never even think about RAID 5 for Hyperion as it has some well known severe performance penalties (up to 4 x) -- this 4 x means you need 4 times the drives to get the equivalent read/write capabilities of 1 real physical drive.
John A. Booth
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