what Joe stated is very true, doing multiple task that access the drive at the same time will always be faster on scsi devices. all drives can be accessed at the same time, and they don't have the overhead of IDE which is about 25%, so you loose overall speed with IDE. so if you think you have 100mb/sec your really getting 75MB/sec.
I have a Mylex accelraid 250 w/16mb cache and 3 fujitsu 10k drives, i don't think I will see an IDE raid go this fast, not now at least.
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overclock everything
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