> It's not a good solution if you can use SATA spindles, but you'll require 6 times as many spindles and a bunch of SSDs, to get average acceptable performance, the cost will be high.
Why is it? Are not seek times inverse proportional to RPMs? So 7K SATA drives should give 30% less IOPS than 10K RPM drives. Does transport make any difference? I was under impression that SATA and SCSI variants are very alike nowdays. Is there difference in drives' firmwares? But then what is stopping manufacturers to put a better performing firmware on consumer devices? I really don't understand what factors can make 6x difference, could you please elaborate?